Tanzanite and aquamarine are two captivating blue gemstones, but they are quite different when it comes to color, durability, rarity, origin, care, and suitability for everyday jewelry. If you're deciding between tanzanite vs. aquamarine, the right choice largely depends on how you plan to wear the gemstone and the shade of blue you prefer.
Aquamarine generally offers better scratch resistance, ranking 7.5 to 8 on the Mohs scale, and is a practical choice for jewelry worn frequently. Tanzanite ranks 6 to 7 and requires more careful wear, but it stands apart for its striking blue-to-violet appearance and unusual geographic rarity.
So, should you choose aquamarine or tanzanite? Let's compare the two gemstones in detail.
Quick Answer: Tanzanite or Aquamarine?
Choose aquamarine if you prefer a refreshing light-to-medium blue gemstone, want better scratch resistance for frequent wear, or are shopping for a March birthstone.
Choose tanzanite if you love richer blue-violet or violet-blue colors, appreciate a gemstone with a highly localized source, are shopping for a December birthstone, and don't mind giving your jewelry some extra care.
Neither gemstone is universally "better." Aquamarine has an advantage for durability, while tanzanite stands out for its distinctive violet-blue color and geographic rarity.
Tanzanite vs. Aquamarine at a Glance
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What Is Aquamarine?
Aquamarine is the blue to slightly greenish-blue variety of the mineral beryl, the same mineral family that includes emerald. Its name comes from Latin words associated with seawater, which perfectly complements its refreshing ocean-inspired appearance.
Aquamarine is found in several parts of the world, with Brazil being an important source. According to the Gemological Institute of America (GIA), other sources include countries such as Pakistan, Zambia, Mozambique and Nigeria.
Aquamarine is also the traditional March birthstone and is associated with the 19th wedding anniversary.
With a Mohs hardness of 7.5 to 8, aquamarine offers relatively good resistance to scratching, making it a versatile option for many types of jewelry.
What Is Tanzanite?
Tanzanite is the blue-to-violet variety of the mineral zoisite. The gemstone takes its name from Tanzania, where its commercial deposits are located.
One of tanzanite's most distinctive characteristics is its highly localized source. According to GIA, tanzanite is commercially mined in the Merelani Hills of northern Tanzania. This geographic concentration is one reason the gemstone is considered unusual within the colored gemstone world.
Tanzanite is one of the December birthstones and is also associated with the 24th wedding anniversary.
With a Mohs hardness of approximately 6 to 7 and fair-to-poor toughness, tanzanite requires more careful handling than aquamarine, particularly when worn in rings.
Tanzanite vs. Aquamarine: What Are the Main Differences?
The most important differences between aquamarine and tanzanite involve their color, mineral composition, durability, origin, rarity, treatments, clarity and overall suitability for different types of jewelry.
Color: Aquamarine vs. Tanzanite
Mineral Composition
Clarity
Hardness and Durability
Rarity and Origin
Treatments
Tanzanite vs. Aquamarine Price
Color is one of the easiest ways to distinguish these gemstones visually.
Aquamarine ranges from blue to slightly greenish blue. Many aquamarines display light, refreshing tones reminiscent of clear seawater, although more saturated blue stones can also occur.
Tanzanite typically displays blue-violet to violet-blue colors. Its appearance can vary with lighting and viewing direction because tanzanite exhibits pleochroism—the ability to show different colors when viewed from different directions.
If you prefer a soft, cool and ocean-like blue, aquamarine may appeal to you more. If you prefer a deeper blue with violet or purple undertones, tanzanite may be the more appealing choice.
Aquamarine and tanzanite may both appear blue, but they belong to completely different mineral families.
Aquamarine is a variety of beryl, whereas tanzanite is a variety of zoisite. Their different mineral structures contribute to differences in hardness, toughness, optical properties and overall appearance.
Both aquamarine and tanzanite can offer impressive clarity, but buyers should avoid assuming that every stone will be flawless.
Faceted aquamarines are often eye-clean, meaning inclusions cannot easily be seen without magnification. Fine-quality tanzanite can also appear clean to the unaided eye, although inclusions may occur.
When shopping for either gemstone, evaluate the individual stone rather than relying solely on the gemstone variety. Highly visible inclusions—particularly fractures—can affect appearance, durability and value.
This is one of the most important differences for anyone planning to wear the gemstone frequently.
Aquamarine ranks 7.5 to 8 on the Mohs hardness scale, while tanzanite ranks approximately 6 to 7.
Hardness describes resistance to scratching, however, and should not be confused with toughness, which describes resistance to breaking and chipping.
Tanzanite has cleavage and requires protection from hard blows. For this reason, aquamarine is generally the more forgiving option for jewelry that will be worn frequently, particularly rings.
Tanzanite can still make a beautiful ring, but a protective setting and careful wearing habits become more important.
Aquamarine occurs in multiple gemstone-producing regions around the world. Tanzanite has a much more geographically restricted commercial source.
GIA identifies the Merelani Hills in northern Tanzania as the world's commercial source of tanzanite. This limited geographic origin gives tanzanite a distinctive rarity story.
However, rarity should not automatically be interpreted as guaranteed future financial appreciation. A gemstone's market value depends on several factors, including quality, demand, size, color, clarity and market conditions.
Treatment disclosure is an important part of making an informed gemstone purchase.
Aquamarine: Heat treatment is commonly used to reduce greenish components and produce a more distinctly blue appearance.
Tanzanite: Much of the blue-to-violet tanzanite available in the market has been heat treated. Heating reduces or removes unwanted brownish, yellowish or greenish components and emphasizes its desirable blue and violet colors.
Heat treatment is well established in the gemstone industry, but buyers should still ask sellers about known gemstone treatments when purchasing fine jewelry.
There isn't a reliable rule stating that every tanzanite will cost more than every aquamarine. The value of an individual gemstone depends on its color, saturation, clarity, cut, carat weight, treatment and overall quality, along with current market conditions.
For aquamarine, stronger desirable blue color and good clarity can contribute to value. For tanzanite, richly saturated blue-to-violet color is particularly desirable.
Therefore, compare individual gemstones of similar size and quality rather than choosing based only on the assumption that one gemstone variety is always more expensive than the other.
Which Is Better for Everyday Wear: Tanzanite or Aquamarine?
Aquamarine is generally the more practical choice for frequent wear because its Mohs hardness of 7.5 to 8 gives it better resistance to scratching than tanzanite.
Tanzanite's hardness of 6 to 7 and its cleavage mean that it deserves additional protection from scratches, knocks and sudden impacts.
This difference becomes especially important for rings because rings typically experience more contact with surfaces than earrings or pendants.
That doesn't mean tanzanite cannot be worn regularly. Instead, it means the wearer should choose an appropriate setting and remove the jewelry before activities that could expose the stone to impact.
Tanzanite vs. Aquamarine for an Engagement Ring
Both gemstones can create distinctive alternatives to conventional engagement ring stones, but their durability should be considered before choosing.
Aquamarine engagement rings generally provide greater scratch resistance and may therefore be easier to maintain for frequent wear. Their light-to-medium blue color also creates a fresh and romantic appearance.
Tanzanite engagement rings offer striking blue-violet color that can make an engagement ring look particularly distinctive. However, because tanzanite requires more protection from impact, a protective setting and careful wearing habits are advisable.
If durability is your main priority for a ring you expect to wear frequently, aquamarine generally has the advantage. If distinctive violet-blue color is the priority and you are comfortable with additional care, tanzanite can be an appealing choice.
Which Gemstone Is Better for Different Types of Jewelry?
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How to Choose Between Tanzanite and Aquamarine
Instead of asking which gemstone is universally better, consider which characteristics matter most to you.
- Choose aquamarine for durability: Its higher Mohs hardness makes it more resistant to scratches.
- Choose tanzanite for blue-violet color: Its violet and blue appearance distinguishes it from the lighter look commonly associated with aquamarine.
- Choose aquamarine for frequent ring wear: It is generally the more forgiving of the two, although all fine jewelry requires care.
- Choose tanzanite for geographic rarity: Its commercial source is concentrated in one small area of Tanzania.
- Choose according to birth month: Aquamarine represents March, while tanzanite is one of December's birthstones.
- Choose based on the individual stone: Color, clarity, cut, carat weight and overall craftsmanship matter regardless of gemstone variety.
How to Care for Tanzanite and Aquamarine Jewelry
Proper care can help preserve the beauty of either gemstone.
How to Care for Aquamarine
- Clean aquamarine using warm water, mild soap and a soft brush.
- Protect it from hard knocks despite its relatively good hardness.
- Avoid exposing fine jewelry to harsh household chemicals.
- Store pieces separately to reduce scratching from harder gemstones.
How to Care for Tanzanite
- Use warm, soapy water and a soft brush for routine cleaning.
- Avoid steam and ultrasonic cleaners.
- Protect tanzanite from sudden temperature changes and hard impacts.
- Remove tanzanite rings before exercise, household chores or other strenuous activities.
- Store the jewelry separately from harder gemstones.
Aquamarine and Tanzanite as Birthstones and Anniversary Gifts
Aquamarine and tanzanite also carry significance beyond their appearance.
Aquamarine is the birthstone for March and is traditionally associated with the 19th wedding anniversary. Its cool blue appearance makes aquamarine jewelry a meaningful option for March birthdays and anniversary gifts.
Tanzanite is one of the birthstones for December and is associated with the 24th wedding anniversary. Its blue-violet appearance and Tanzanian origin give it a distinctive identity for milestone jewelry.
Tanzanite vs. Aquamarine FAQs
Is tanzanite rarer than aquamarine?
In terms of geographic source, tanzanite is significantly more restricted. Commercial tanzanite mining is concentrated in the Merelani Hills of northern Tanzania, whereas aquamarine is found in several gemstone-producing regions worldwide.
Is aquamarine harder than tanzanite?
Yes. Aquamarine ranks 7.5 to 8 on the Mohs hardness scale, compared with approximately 6 to 7 for tanzanite. This gives aquamarine greater resistance to scratching.
Which is better for everyday wear, aquamarine or tanzanite?
Aquamarine is generally the more practical option for frequent wear because of its higher hardness. Tanzanite can still be worn in jewelry, but it requires greater protection from impacts, scratches and sudden temperature changes.
Which is more expensive, tanzanite or aquamarine?
Neither gemstone is always more expensive. Price varies according to factors such as color, saturation, clarity, cut, carat weight, treatment, craftsmanship and market conditions. Compare individual gemstones of similar quality rather than relying on gemstone type alone.
Can tanzanite and aquamarine be used in engagement rings?
Yes, both can be used in engagement rings. Aquamarine generally offers better scratch resistance for frequent wear. Tanzanite offers distinctive violet-blue color but benefits from a protective setting and more careful handling.
Are aquamarine and tanzanite usually treated?
Heat treatment is common for both gemstones. Aquamarine may be heated to reduce greenish tones and enhance its blue appearance, while much of the tanzanite available in the market is heated to emphasize its blue and violet colors. Buyers should ask about known treatments when purchasing gemstone jewelry.
How can you tell tanzanite from aquamarine?
Color can provide an initial clue: aquamarine typically appears blue to slightly greenish blue, while tanzanite often shows stronger violet-blue or blue-violet hues. However, color alone is not a reliable method of gemstone identification. If identification matters, obtain an assessment or report from a qualified gemological professional or laboratory.
So, Should You Choose Tanzanite or Aquamarine?
The best choice depends on what you value most in your jewelry.
Aquamarine may suit you better if you want a refreshing ocean-blue appearance, greater scratch resistance and a gemstone that is generally more forgiving for frequent wear.
Tanzanite may suit you better if you're drawn to rich blue-violet colors, appreciate its geographically restricted origin and are comfortable giving your jewelry additional care.
Rather than treating the decision as simply a battle between two blue gemstones, consider the jewelry type, how often you'll wear it, your preferred color, the individual stone's quality and your lifestyle. Both gemstones can make beautiful jewelry when chosen with these factors in mind.
Gemological Sources
Technical gemstone information in this guide was checked against educational resources from the Gemological Institute of America (GIA). For additional independent information, see GIA's Aquamarine Guide and GIA's Tanzanite Guide.