What are you looking for?
SUMMER WEDDING: 10% OFF (CODE: π‘Ίπ‘Όπ‘΄πŸπŸŽπŸπŸ”)
UNLOCK 15% OFF ON $1,000+ (CODE: π‘Ύπ‘¬π‘«πŸπŸŽπŸπŸ”)

Alexandrite vs Tanzanite: Durability, Cost, and Color

When choosing a colored gemstone, it’s important to consider more than just aesthetics. Many buyers compare alexandrite vs tanzaniteΒ because they are both rare and visually striking. They are also popular choices for engagement ringsΒ and fine jewelry.

However, they differ significantly in color, hardness, rarity, price, and suitability for everyday wear.

Simply put, alexandrite is prized for its color-changing effect and durability, while tanzanite is beloved for its deep blue-violet color and affordability.

This guide explains how alexandrite and tanzanite compare in color, hardness, cost, and everyday wearability, helping you decide which gemstone is the better choice for your jewelry.

alexandrite vs tanzanite

Table of Contents

Alexandrite vs Tanzanite at a Glance

Feature Alexandrite Tanzanite
Mineral Family Chrysoberyl Zoisite
Hardness (Mohs) 8.5 6–6.5
Color Behavior Color-changing (green to red/purple) Blue-violet
Rarity Extremely rare Rare but more available
Price Very high Moderate to high
Best Use Engagement rings, heirloom jewelry Statement jewelry or occasional wear

Alexandrite appeals for its dynamic color and durability, while tanzanite attracts those seeking vivid blue tones at a more approachable price.

Alexandrite vs Tanzanite: Color-Changing vs. Velvet Blue

Color is often the deciding factor when choosing between these gemstones.

  • Alexandrite changes from bluish-green in daylight to red or purple under indoor lighting, creating a unique visual effect.
  • Tanzanite, on the other hand, displays a consistent blue-violet color, often with a velvety royal blue tone and subtle purple undertones. It is ideal for those who prefer a bold, predictable color.
Pear Shaped Alexandrite & Moonstone Engagement Ring in Rose Gold
Pear Shaped Alexandrite & Moonstone Engagement Ring in Rose Gold
Pear Shaped Tanzanite with Moissanite Blossom Engagement Ring Double Claws In Rose Gold
Pear Shaped Tanzanite with Moissanite Blossom Engagement Ring

Alexandrite vs Tanzanite: Durability & Hardness

Durability is essential for rings that are worn daily.

  • Alexandrite ranks 8.5 on the Mohs scale, making it highly scratch-resistant and ideal for engagement rings and heirloom jewelry.
  • In contrast, tanzanite is softer (6-5 on the Mohs scale) and more prone to scratches or chips, so it requires careful protective settings.

For everyday wear, alexandrite generally offers better long-term durability, while tanzanite is better suited for statement pieces or occasional wear. The right choice depends on how often you’ll wear the ring and your lifestyle.

Oval Cut Gold Alexandrite Cluster Engagement Ring with Topaz Accents
Oval Cut Lab Alexandrite Engagement Ring with Topaz Accents
MOLLYJEWELRY Gold Tanzanite Engagement Ring
Oval Cut Tanzanite Engagement Ring In Yellow Gold Anniversary Gift

Alexandrite vs. Tanzanite: Price & Value

Price is another major difference between alexandrite and tanzanite.

  • Natural alexandrite is rare and expensive, but lab-grown alexandrite from MollyJewelryUS offers the same stunning color change and durability at a more affordable price.
  • Tanzanite, which is mined only in northern Tanzania, offers bold blue-violet tones at a more affordable price. Both stones offer unique value, depending on your priorities and budget.

Tip: Lab-grown alexandrite offers rarity and durability without the premium price, while tanzanite delivers bold color at a moderate cost.

Kite Cut alexandrite Engagement Ring with Emerald Accents
Oval Cut Tanzanite Engagement Ring with Moonstone Blossom in White Gold
Oval Cut Tanzanite Engagement Ring with Moonstone Blossom

Alexandrite vs. Tanzanite: Rarity & Origin

AlexandriteΒ was first discovered in Russia in the early 19th century. It quickly became associated with imperial Russian jewelry. Today, deposits exist in countries such as Brazil, Sri Lanka, and Madagascar; however, fine alexandrite remains exceptionally scarce.

Tanzanite, on the other hand, was discovered much later in 1967 in northern Tanzania. What makes it remarkable is that it is found in only one place on Earth. This limited geographic origin adds to its allure and has helped establish tanzanite as one of the most recognizable modern gemstones.

Both stones are rare, but lab-grown alexandrite provides a sustainable and reliable alternative. Meanwhile, tanzanite appeals to those who appreciate natural blue-violet gemstones.

Alexandrite vs. Tanzanite for Engagement Rings

Both stones can look stunning in an engagement ring, but which one is better depends on your lifestyle.

Alexandrite engagement ringsΒ are durable and visually dynamic, making them ideal for daily wear. Many couples enjoy the symbolism of a gemstone that changes color, reflecting the evolution of their relationship.

Tanzanite ringsΒ offer striking blue-violet tones, especially in halo or vintage-inspired settings. However, they require extra care due to their softness.

At MollyJewelryUS, many couples choose lab-grown alexandrite rings for their stunning color shift and durability. Others prefer tanzanite rings for their vivid blue and have it set carefully to ensure longevity.

Fantasy Cut Long Hexagon Shaped Tilted Lab Alexandrite Asymmetric Half Halo Band
New

Fantasy Cut Long Hexagon Shaped Tilted Lab Alexandrite Asymmetric Half Halo Band

$406
Hexagon Cut Lab Alexandrite Gemstone Cluster Engagement Ring

Hexagon Cut Lab Alexandrite Gemstone Cluster Engagement Ring

$365
Calming Blue Baguette Cut Alexandrite Stacking Ring June Birthday Gift Promise Ring for Her

Calming Blue Baguette Cut Alexandrite Stacking Ring June Birthday Gift Promise Ring for Her

$200
Pear Shaped Alexandrite Engagement Ring Unique Winged Marquise Cluster

Pear Shaped Alexandrite Engagement Ring Unique Winged Marquise Cluster

$360

Caring for Alexandrite and Tanzanite

Although alexandrite is quite durable, routine cleaning and careful storage are key to keeping it looking its best. Tanzanite requires more attention due to its lower hardness.

Tips for caring for alexandrite:

  • Clean with warm water, mild soap, and a soft brush.
  • Ultrasonic cleaners are usually safe for most stones.
  • Store separately from harder gemstones, such as diamonds.

Tips for caring for tanzanite:

  • Avoid ultrasonic or steam cleaners.
  • Remove jewelry before playing sports or engaging in other heavy activities.
  • Store in a soft pouch or lined jewelry box.

Alexandrite vs. Tanzanite: Pros & Cons

Understanding the strengths and limitations of each gemstone can help you make a more informed decision.

Alexandrite:

Pros:

  • Dramatic color-changing effect
  • Durable for daily wear
  • Rare and collectible

Cons:

  • Higher price than tanzanite
  • Large stones may be limited

Tanzanite:

Pros:

  • Rich blue-violet color
  • More affordable
  • Larger stones are easier to obtain

Cons:

  • Softer and less durable
  • Requires careful wear

Alexandrite vs. Tanzanite: Which Should You Choose?

The best choice usually depends on your priorities.

  • Choose alexandrite if you want an extremely rare gemstone that is durable enough for everyday wear and has a unique color-changing effect.
  • Choose tanzanite if you prefer a vivid blue gemstone with a lower price point and bold visual presence.

Ultimately, many jewelry buyers choose based on an emotional connection. The gemstone that captures your attention and feels meaningful is often the right one.

Final Thoughts

Both alexandrite and tanzanite offer unique beauty. The color-changing effect and durability of alexandrite make it a good choice for everyday wear, while the vivid blue-violet tones of tanzanite appeal to those seeking bold, eye-catching jewelry. Ultimately, the best gemstone for you depends on your lifestyle and personal preferences. With the right setting and proper care, either stone can become a cherished piece for years to come.

FAQ

What is the Difference between alexandrite and tanzanite?

Alexandrite changes color from green to red or purple, while tanzanite has a consistent blue-violet hue. Alexandrite is harder (8.5 on the Mohs scale), while tanzanite is softer (6–6.5 on the Mohs scale).

Natural alexandrite is very expensive. Lab-grown alexandrite offers the same color and durability at a lower price. Tanzanite is generally more affordable.

Yes, it has the same composition, hardness, and color-changing properties. Lab-grown alexandrite is also more sustainable, consistent, and cost-effective.

Lab-grown alexandrite is suitable for daily wear, but tanzanite should be worn in protective settings and removed during heavy activity.

Alexandrite is ideal for daily wear because of its unique color change, while tanzanite is striking in halo or vintage settings, but it requires care.

Introduction

From an environmental sustainability perspective, all of our items are made to order. This production approach allows us to minimize raw material waste, avoid overproduction, and ensure that each piece is crafted specifically for the customer in optimal condition.

Please note that production typically takes approximately 2–3 weeks. As each item is individually made with care and attention to detail, we believe the additional time ensures a higher level of quality and craftsmanship.

  • Delivery time = production time + shipping time
  • We mostly use USPS as our partner for domestic shipping.
  • We select different shipping carriers for international orders based on the specific circumstances of each country.
  • A tracking number will be updated after we send out the package.

Production Time

Please allow an additional 4 business days for Silver and Platinum pieces. Weekends and public holidays are not counted as business days.

  • General production time: 21 business days.
  • Expedited production time: 14/18 business days.

Shipping time

  • Domestic (United States): Delivery 3-5 business days after production finishes.
  • Other Regions: Delivery 5-10 business days after production finishes.
  • Note:Β Couriers may not deliver on weekends.Β International shipments can sometimes experience delays in customs clearance.

Shipping Fee

  • Domestic (United States):Β Free shipping.
  • Other Regions: From USD$40 to USD$100. You may use the shipping calculator on the cart page to view specific costs.
  • Note:Β If the shipping address is not accessible, we will contact you before production.

About Customs Duties

  • Duty-Free Coverage:Β We cover customs duties for packages sent to Canada, Australia, and the United Kingdom, where we have partner warehouses.
  • Disclaimer On Customs Duties:Β For other regions, all customs and import duties would be charged once the package(s) arrive in the destination country. These charges, if any, must be paid by the customers. If the customers refuse to accept the package due to import duties or taxes, they will assume full responsibility for all return shipping, customs fees, and handling charges.

Need Help?

Custom Wedding Band Options
Made to Match Your Engagement Ring

Finding a wedding band that truly fits your engagement ring can be challenging. With our Custom Fit Service, any curved wedding band, enhancer wedding band, or open wedding band can be tailored to match your ring’s exact shape β€” even if your engagement ring was not purchased from us. In this guide, we’ll walk you through our services and processes in detail. Let’s get started!

Why do you need a custom wedding band?

More and more couples are choosing unique, personalized engagement rings, making flexible customization options especially important when finding the right wedding band. Ready-made bands are designed with general curves and do not account for the specific height, stone shape, prong placement, or profile of your engagement ring.

When the band does not match the engagement ring, you may experience:

* Visible gaps between the two rings

* Rubbing or collisions that can loosen stones over time

* Instability, causing the rings to twist or catch on clothing

* A mismatched appearance that does not look intentional

To solve these problems, our custom-fit wedding bands eliminate them by tailoring to the exact structure of your engagement ring, ensuring a seamless fit, comfortable wear, and a cohesive look from every angle.

Case Study 1: Customizing the Curvature of a Curved Wedding Band

In this example, the engagement ring features an organic, asymmetrical cluster design, a structure that most ready-made curved bands cannot naturally follow.

The first image clearly shows this issue: the unmatched curvature leaves a gap in the left side and causes the two rings to sit separately rather than as a cohesive set.

After applying our Custom Fit Service, the wedding band’s curve was redesigned to mirror the exact outline of the engagement ring. The result is a customized curvature that fits snugly, creating a unified, intentional look from every angle.

Case Study 2: Customizing the Gap of a Open Wedding Band

In this example, the customer selected an open wedding band to pair with a halo engagement ring. However, the original opening gap of 7.8mm was too wide for the engagement ring’s setting. This caused the two sides of the open band to sit too far apart, preventing the band from framing the center stone in a balanced, intentional way. To achieve a perfect fit, we reduced the gap from 7.8mm to 5.7mm. By customizing it, the open band now aligns seamlessly with the engagement ring’s profile and is nestled naturally around the halo setting.

Case Study 3: Customizing the Inner Spacing & Curvature of a Ring Enhancer

In this example, the customer chose a ring enhancer to frame an engagement ring with unique center setting and shank. However, the original enhancer was designed with general proportions: the inner spacing was too narrow, and the curvature did not match the engagement ring’s profile. As a result, the engagement ring could not slide in naturally, and the curvature is not the perfect one.

To create a perfect pairing, we adjusted two key elements:

1) Inner Spacing Adjustment: the gap between the two bands of the enhancer was widened so that the customer’s engagement ring could fit comfortably inside without friction or pressure on the prongs. This ensures the rings stack smoothly and remain stable during daily wear.

2) Curvature Refinement: we reshaped the curves to echo the exact outline of the engagement ring’s halo and basket. This prevents unwanted gaps and allows the enhancer to hug the ring in a balanced, symmetrical way.

How Our Custom Fit Service Works?

We make the custom-fit process easy and stress-free. Simply share photos and measurements, and we will customize a wedding band that matches your engagement ring beautifully β€” yes, without sending it in! Here’s how:

1) Share Photos and Measurements: To begin, we ask for clear photos of your engagement ring along with three specific views (front, side, and top).
We also need a few basic measurements such as: *Length & Width of the Center Stone, *Setting Height, *Band Width & Thickness

2) We Create a CAD Model of Your Engagement Ring: Using your photos and measurements, our designers build a precise digital model of your engagement ring. This allows us to see its curvature, profile, height, and overall structure accurately.

3) We Tailor the Wedding Band for a Perfect Fit: Based on the style you choose, whether it is a curved wedding band, open wedding band, or ring enhancer, we adjust every detail to match your engagement ring. This may include: 1️⃣ Refining the curvature to match your ring’s outline. 2️⃣ Adjusting the opening distance for open bands. 3️⃣ Modifying the inner spacing of enhancers to fit around the setting. 4️⃣ Matching band width or thickness when requested (extra cost might be required).

4) Modification Confirmation: We will share the customized design with you for confirmation. Once approved, we begin crafting your one-of-a-kind wedding band.

Our goal is to ensure your wedding band does more than sit beside your engagement ring β€” it should complement it flawlessly, as if it were made for your story from the beginning.

Frequently Asked Questions

Do I need to send in my engagement ring for the custom fit process?

No, you do not need to ship your ring to us. We can create a perfectly fitted wedding band using photos, three specific views, and a few simple measurements.

Yes. Our Custom Fit Service allows us to tailor any wedding band to match your engagement ring’s unique shape, height, and settingβ€”whether it’s a solitaire, halo, cluster, three-stone, unique design, or a custom ring that is not purchased from us. We tweak all the details to ensure you get a perfect wedding set.

The initial modeling stage takes 1–3 days, during which we create a digital representation of your engagement ring and customize the band design. Once you approve the design, production typically takes 2–3 weeks, the same as you selected on the product page.

Yes. Our Custom Fit Service works for any engagement ring, regardless of where it was purchased.

Depending on the design you choose, we may adjust:

  • The curvature of the band

  • The opening distance of an open band

  • The inner spacing of a ring enhancer

  • The band width or thickness (extra cost might be required if needed)

Absolutely. We will send you a detailed digital mock-up showing how your curved band aligns with your engagement ring. Production only begins after you approve the design.

The service is $100, available as an add-on option on our wedding band product pages.

This is extremely rare due to the precision of our modeling process, but if an issue arises, please be confident that we stand behind our work. Rest assured that we will review the details and offer a solution based on the specific situation.

Yes. In many cases, a straight band can be reshaped with a custom curvature to match your engagement ring. Feel free to contact us if you have any customization ideas.

Yes, we can. In addition to our Custom Fit Service, which tailors a wedding band specifically to your engagement ring, we can create custom wedding band designs that are not listed on our site. Feel free to contact us if you are interested in working with us for something special!

Yes. We can customize men’s wedding rings to complement women’s engagement rings or wedding bands. Whether you want both rings to share matching silhouettes, profiles, design elements, or finishes, we can tailor the men’s band to create a coordinated and cohesive set that feels connected while still reflecting each person’s style.

1. Getting Started:

Online shopping offers a wide variety of choices, but when it comes to purchasing rings, it can be trickyβ€”you can’t be certain of the fit without trying it on!

At MollyJewelryUS, we completely understand your concerns, which is why we’ve created this guide to make your decision easier.

Please take the time to carefully review this guide, as all of our rings are made to order, and a 35% restocking fee applies to exchanges and refunds.

Now, let’s walk you through the measurement process!

2. Key Points to Know About Ring Sizes:

1) Different Bandwidth Affects The Wearing Experience

  • The Bandwidth We Commonly Use: We usually use a 1.4 to 2mm bandwidth for our women’s rings, which can be considered Narrow Bands. Please check the specific bandwidth in the product description section.
  • Narrow Bands May Feel Larger: For rings with a narrower width, some customers may find that the sizes feel larger than expected. This is because narrow bands apply less pressure on the finger, making them feel looser when worn.
  • Wider Bands and Enhancer Bands May Feel Snugger: A ring with a wide band usually feels tighter than its actual size because it covers a larger area of the finger. Therefore, if you choose a wider ring (bigger than 2mm) or enhancer band (also known as a ring guard or ring jacket), then you may need to choose a quarter or half size larger than the narrower ring to ensure comfort.
  • Adjusting for a Perfect Fit: Please know the bandwidth affecting the wearing experience before your purchase to ensure that you get the right size.

2) Resizing Considerations

  • Resizing Limitations: Not all rings can be resized easily. Rings with intricate designs, and eternity bands with stones all around may have limited resizing options. It’s important to choose the correct size from the start if you’re considering these styles.
  • Potential Risks of Resizing: Resizing can sometimes weaken the structural integrity of a ring, especially if it’s adjusted significantly. For rings with side stones, resizing can also affect the setting of the stones and can cause them to fall out easily.
  • Alternatives to Resizing: If resizing isn’t an option, there are alternatives like using sizing beads, ring guards, or exchanging the ring for the correct size if possible. These solutions can help achieve a better fit without compromising the ring’s design or structure.

3. How To Determine Ring Size?

1) Measure A existing rings

* If you know there is a ring that fits perfectly, but you are not sure about its size: Measure the inside diameter and the bandwidth by placing a ruler either on top of the ring or underneath it.

* Please send us some photos according to the following pictures, and we will assist you in choosing the correct size!

2) Use a ring size gauge to find out the perfect size

* If you don’t know the size at all, this would be the best way to take your measurements! Since it’s metallic, it more closely resembles the feeling of wearing a ring, and you can easily tell the size by checking the labels. If you want to be foolproof, you can also take a photo according to Method 1, and send it to us.

3) Use a ring sizer for the measurement

* Please don’t snap it too tightly or loosely, makeΒ sure it can turn around on yourΒ finger,Β but there are no gaps. Sending us a picture of wearing it on your finger would be helpful for the judgment.

4) Get sizing at your local jeweler

It’s a good idea to get sized at a nearby jeweler! However, please ask them about the bandwidth they usually use. Just like mentioned at the beginning, a ring with a narrow band will fit slightly larger on the same size, while a ring with a wider band will fit more snugly. The reasoning is simple: the more metal on your finger, the more space it takes up and the tighter it will fit.

5) Measure the circumference of The finger

Unlike metal or plastic, paper strips and thread are thicker and more flexible. As a result, they can create a slight bulge or slack when wrapped around the finger, leading to a measurement slightly larger than the actual size.

Though this way is simple and convenient, it is usually used as a secondary insight, as it may not provide the same accuracy as professional ring sizing tools.

Notice:Β Please measure multiple times to ensure errors are minimized.Β Additionally, please let us know your/her height and weight as a reference if you intend to use this method.

*Use a strip of paper, a piece of string, or a measuring tape around your finger and mark the overlap. Then, take it off, make it straight, and measure from the beginning to the overlap.

Please send us a photo of the measuring strip or string.

*Use a strip of paper or a piece of string around your finger and mark the overlap. Then, take it off, make sure it is straight, and measure from the beginning to the overlap.

Please send us a photo of the measuring strip or string.

In conclusion: If you are measuring at home, sending us pictures of your measuring process is a very important step.Β 

If you need any assistance, please get in touch with us at service@mollyjewelryus.com

4. Sizing & Design Tips

  • For ring sizes smaller than 4US
    Rings with smaller circumferences have tighter curvature, which can put extra stress on the side settings and make side stones more prone to loosening over time.
    We recommend choosing designs with fewer or smaller side stones to ensure long-lasting durability and comfort.

  • For ring sizes bigger than 9US
    Larger rings naturally experience greater structural stress when worn, as the metal band spans a wider circle and endures more bending force during daily wear.
    To maintain proper strength and balance, we suggest choosing styles with a band thickness of at least 1.6 mm. If you notice that the thickness listed on our product page does not meet this specification, feel free to contact us for customization.

RING SIZE CHART