How to Buy Tanzanite: Understanding Its Rarity and Choosing a Stone You'll Keep
Tanzanite comes from a single source on earth, the Merelani Hills of Tanzania, which makes it finite and a thoughtful buy. Prioritize a rich blue-violet color, the deeper and more saturated the better. Heat treatment is standard and accepted, so assume it. Tanzanite is softer at 6.5 to 7 on the Mohs scale, so choose protective settings and reserve it for earrings, pendants, and occasional-wear rings rather than daily knocks.
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Start HereWhy One Source MattersChoosing the ColorBudget RangesSettings & CareWhere to BuyTanzanite is unlike any other gem a buyer will consider: it comes from one small place on earth, it shows different colors as it turns, and it is softer than the stones it is often compared to. This guide turns those quirks into a confident purchase, how to judge the blue-violet, what to spend, and how to set a stone meant to last.
Start with the Decision, Not the Stone
One source
Tanzania only
6.5-7
Mohs hardness
December
Birthstone
Heat
Standard treatment
Tanzanite is the blue-violet variety of the mineral zoisite, and it was discovered only in the 1960s in the Merelani Hills of Tanzania, the single commercial source on earth. That finite supply is central to its appeal and a reason many buyers choose it now.
The key idea: tanzanite is bought for its rich blue-violet color and its rarity, not for hardness. At 6.5 to 7 on the Mohs scale it needs more care than sapphire. Tanzanite is the birthstone for December, and the ultimate birthstone guide sets it among the winter stones.
Why a Single Source Matters
Tanzanite's one-deposit origin is not a marketing line; it shapes the whole buying decision.
Buyer's Note
Tanzanite is mined commercially in only one place, the Merelani Hills of Tanzania, and the deposit is widely expected to be worked out within a generation. That makes a fine tanzanite a finite thing to own, which many buyers value. It also means you should buy the best color you can afford now rather than assuming an identical stone will be cheaper later, and that a lab report stating natural zoisite is worth having for a significant purchase.
Rarity is a reason to prioritize color and documentation, a theme the fine jewelry buying guide returns to for finite gems.
Choosing the Color
Color is where nearly all of tanzanite's value lives, and its pleochroism makes color the most interesting part of the choice.
Hue
The most prized tanzanite is a deep, rich blue to blue-violet. Pure blue stones are rarest and most valuable; violet-dominant stones are lovely and more reachable.
Saturation and tone
Aim for a deep, vivid, saturated color. Pale, washed-out tanzanite is far less valuable, while an overly dark stone can lose life in low light.
Pleochroism
Tanzanite shows blue, violet, and sometimes burgundy depending on the viewing direction and lighting. Expect it to read more blue in daylight and more violet under warm indoor light.
For a full breakdown of grading the blue-violet, see the guide to evaluating tanzanite quality.
Tanzanite Budget Ranges
These are general market ranges for tanzanite in a finished piece, not Oath prices, to set expectations before you shop.
| Tier | Typical range | What you can expect |
|---|---|---|
| Everyday | Low hundreds | Smaller, lighter blue-violet stones, eye-clean, ideal for studs, accents, and pendants |
| Fine | Several hundred to a few thousand | Larger stones with deep, saturated blue-violet color for a center piece |
| Investment | Many thousands and up | Top deep-blue stones with vivid saturation, fine clarity, and a report |
Because the supply is finite, fine deep-blue tanzanite has trended upward over time, which is part of why buyers treat a top stone as something to hold.
Settings, Metal, and Care
Tanzanite's softness makes the setting a protective decision, and metal choice shapes how the color reads.
Clean tanzanite only with warm soapy water and a soft brush, and store it away from harder gems that could scratch it.
Where and How to Buy with Confidence
Buy from a seller who discloses treatment and, for a significant stone, supplies a report stating natural zoisite.
Assume heat, confirm natural
Nearly all tanzanite is heated, which is standard and accepted. What matters is that the stone is natural zoisite, which a report confirms.
Judge color in two lights
View tanzanite in daylight and warm indoor light before buying, and use a return window, since its color shifts between them.
Prioritize color over size
A smaller, deeply saturated blue stone is a better buy than a larger pale one. Spend on color first.
Choose the deepest blue-violet your budget allows, protect it in the right setting, and a tanzanite becomes a finite, beautiful gem to keep.
Tanzanite is the violet blue to blue violet variety of the mineral zoisite
Gemological Institute of America (GIA)
Further reading: GIA, Tanzanite. GIA describes tanzanite as the blue-violet variety of zoisite, mined commercially in only one area of the world; because the source is single and finite and color drives value, a buyer should prioritize a rich, saturated blue-violet and confirm the stone is natural zoisite.
In Short
1Tanzanite comes from a single source on earth, the Merelani Hills of Tanzania, which makes fine stones finite and a thoughtful long-term buy.
2Color drives value: prioritize a deep, rich, saturated blue to blue-violet, and expect pleochroism to shift the stone between blue and violet in different light.
3Tanzanite is softer at 6.5 to 7 on the Mohs scale, so assume heat treatment, choose protective settings, favor earrings and pendants, and never steam or ultrasonic clean it.
The Tanzanite Color & Care Guide
A one-page buyer's reference with the blue-violet tones to look for, what its single source means for value, price tiers, and how to protect a softer stone. We will email it to you.
Email Me the Guide →
Every order ships free with a 30-day return policy.
Tanzanite rewards a buyer who understands what makes it special: one source, a color that dances between blue and violet, and a softness that asks for care. Buy the richest blue-violet you can afford, set it to protect it, and clean it gently. Do that, and you will own a finite gem that few others can match. Every order ships free with a 30-day return policy.
Frequently Asked Questions
01
What should I look for when buying tanzanite?
Color, above all. Look for a deep, rich, saturated blue to blue-violet stone, since pure blue is rarest and most valuable while violet-dominant stones are more reachable. Tanzanite's pleochroism means it shows blue and violet in different directions and lighting, so view it in both daylight and warm indoor light.
02
Why is tanzanite considered rare?
Tanzanite is mined commercially in only one place on earth, the Merelani Hills of Tanzania, and that deposit is widely expected to be worked out within a generation. This single, finite source is central to tanzanite's appeal and a reason many buyers choose to own a fine stone now.
03
Is heat-treated tanzanite worth buying?
Yes. Nearly all tanzanite is heated to bring out its blue-violet color, and this is standard, accepted practice rather than a flaw. What matters is that the stone is natural zoisite, which a report confirms for a significant purchase, not whether it has been heated.
04
How much should tanzanite jewelry cost?
Smaller, lighter blue-violet stones in studs and accents start in the low hundreds, larger deeply saturated center stones run from several hundred to a few thousand, and top deep-blue stones with vivid color and a report reach many thousands. Finite supply has pushed fine color upward over time.
05
Can I wear tanzanite every day?
With care, but not as an unprotected daily ring. At 6.5 to 7 on the Mohs scale tanzanite is softer than sapphire and can chip or crack from hard knocks, so it is best in earrings and pendants, or in rings with protective settings reserved for occasional wear.
06
How do I care for tanzanite?
Clean it only with warm soapy water and a soft brush, never a steam or ultrasonic cleaner, which can crack the stone through thermal shock. Store tanzanite away from harder gems that could scratch it, as the guide to evaluating tanzanite quality explains.
