Tanzanite’s mesmerising blue-violet hue has captured the hearts of jewellery lovers and collectors across the world. But behind its shimmering beauty lies a rich and surprising story that makes this rare gemstone even more enchanting.
At Prins & Prins Diamonds, we believe that understanding the story behind a gemstone deepens its value and meaning. Whether you are considering Tanzanite for your next jewellery piece or simply wish to learn more, here are ten fascinating facts about Tanzanite that may surprise even the most avid gemstone enthusiasts.
1️⃣ Tanzanite is 1,000 Times Rarer Than Diamonds
While diamonds are mined on multiple continents, Tanzanite is found exclusively in one tiny corner of the world: a narrow, 4-kilometre strip in the Merelani Hills near Mount Kilimanjaro, Tanzania.
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This unique geological formation means that Tanzanite is roughly 1,000 times rarer than diamonds【1】.
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Once the current deposit is depleted — which many experts believe could happen within this generation — there may be no further Tanzanite mined anywhere on Earth.
This rarity makes Tanzanite one of the most exclusive and sought-after gemstones in the world.
2️⃣ Discovered Only in 1967
Unlike diamonds, sapphires or rubies with histories stretching back thousands of years, Tanzanite’s discovery is remarkably recent.
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In 1967, a Maasai tribesman stumbled upon vivid blue crystals shimmering in the Tanzanian soil.
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The discovery was quickly recognised as significant, and within a few short years, Tanzanite had captured the attention of the global jewellery industry.
In just over half a century, Tanzanite has risen from obscurity to become one of the world’s most desirable coloured gemstones.
3️⃣ Named by Tiffany & Co.
When first discovered, Tanzanite was known by its mineralogical name, “blue zoisite”. However, this name was considered commercially unappealing, partly because “blue zoisite” sounded too close to “suicide.”
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In 1968, Tiffany & Co. rebranded the gemstone as “Tanzanite”, in honour of its country of origin【2】.
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This clever marketing decision helped launch Tanzanite onto the international jewellery scene.
To this day, the name “Tanzanite” instantly evokes exotic beauty and exclusivity.
4️⃣ Tanzanite is Trichroic
One of Tanzanite’s most fascinating optical properties is trichroism — the ability to display three distinct colours depending on the angle of light.
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Tanzanite can appear blue, violet, or burgundy depending on how it is cut and viewed.
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Master cutters carefully orient each stone to bring out its most desirable hues, typically favouring vivid blue with violet flashes.
This shifting play of colour creates Tanzanite’s characteristic vibrancy and depth, making each gemstone uniquely captivating.
5️⃣ Starts as Brownish Zoisite Before Heating
Most Tanzanite found in nature begins life as brownish-grey zoisite.
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Through a controlled heating process, the brownish tones are removed, revealing Tanzanite’s signature blue-violet colour.
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This heat treatment mirrors natural geological heating processes and is considered an accepted and stable enhancement【3】.
Unheated, naturally blue Tanzanites do exist, but they are exceedingly rare and highly valuable.
6️⃣ A New Birthstone Addition
While most birthstones have ancient origins, Tanzanite holds the distinction of being one of the few recent additions to the modern birthstone list.
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In 2002, the American Gem Trade Association officially added Tanzanite as a December birthstone.
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It now shares December’s slot alongside zircon and turquoise, making it an especially meaningful gift for December-born individuals【4】.
This modern status adds to Tanzanite’s unique appeal as both a rare gemstone and a personalised birthstone option.
7️⃣ Maasai Legend: The Magic Stone
According to local Maasai legend, lightning once struck the plains surrounding Mount Kilimanjaro, setting the earth ablaze. After the fire cooled, the ground was littered with sparkling blue crystals — Tanzanite.
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For the Maasai people, Tanzanite became known as a “magic stone”, symbolising new beginnings, good fortune, and spiritual growth【5】.
Even today, Tanzanite remains a cherished gift among Maasai families to celebrate childbirth and significant life milestones.
8️⃣ The Largest Tanzanite Crystal Ever Found
In 2020, Tanzanian miner Saniniu Laizer made headlines with the discovery of two enormous Tanzanite crystals.
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The larger of the two weighed an astonishing 9.27 kilograms (20.46 pounds) — one of the largest Tanzanite crystals ever unearthed【6】.
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These record-breaking discoveries reaffirm both the beauty and scarcity of this extraordinary gemstone.
Such discoveries are exceedingly rare and serve as a reminder of Tanzanite’s finite supply.
9️⃣ Exclusive Single-Source Origin
Unlike gemstones mined across multiple continents, Tanzanite comes from just one location on Earth — the Merelani Hills in northern Tanzania.
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This single-source origin ensures that every Tanzanite stone carries a direct connection to its birthplace.
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The Tanzanian government has implemented increasingly strict mining regulations to safeguard ethical mining and long-term resource sustainability【7】.
For collectors, Tanzanite’s exclusive origin enhances its narrative and collectability.
🔟 Highly Valued by Collectors and Investors
As natural resources become more limited, interest in investment-grade Tanzanite continues to rise.
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Large, vividly saturated stones with excellent clarity are becoming increasingly difficult to source.
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Serious collectors view Tanzanite not only for its beauty but also as a potential store of long-term value【8】.
At Prins & Prins Diamonds, we guide clients in sourcing certified, ethically mined Tanzanite of the finest quality for both personal enjoyment and future legacy.
Experience Tanzanite’s Rare Beauty at Prins & Prins Diamonds
Whether you are captivated by Tanzanite’s extraordinary colour, its enchanting backstory, or its growing collectability, one truth remains: no two Tanzanite stones are ever the same. Each carries a story millions of years in the making.
At Prins & Prins Diamonds, we offer an exclusive collection of ethically sourced Tanzanite Jewellery in Cape Town, expertly curated for clients seeking one-of-a-kind creations.
Explore the world of Tanzanite with us — where nature’s rarest beauty becomes your personal masterpiece.
Prins & Prins Diamonds: Crafting rare beauty for life’s most treasured moments.
References
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The Rare Gemstone Company. Tanzanite’s Rarity Explained, 2022. www.theraregemstonecompany.com
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Tiffany & Co. Archives. The Naming of Tanzanite, 1968. www.tiffany.com
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GIA (Gemological Institute of America). Tanzanite Treatment Overview, 2021. www.gia.edu
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American Gem Trade Association (AGTA). Birthstone Chart, 2002. www.agta.org
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Tanzanian Gemological Centre. Maasai Legends and Tanzanite, 2020. www.tgc.ac.tz
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BBC News. Tanzanite Miner Finds Rare 9kg Gem, 2020. www.bbc.com
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Tanzanian State Mining Corporation (STAMICO). Tanzanite Mining Regulations, 2022. www.stamico.co.tz
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Gemval. Tanzanite Price Index and Market Trends, 2023. www.gemval.com
