The image shows an informational poster about the Tanzanite gemstone. The poster is mounted in a white frame on a white wall. It is situated in a shop or exhibition space in Stone Town, Zanzibar, Tanzania, with a location indicated by coordinates -6.162 latitude and 39.187 longitude. The poster features a large, circular image of a Tanzanite gemstone in the center, surrounded by smaller, circular images of the gem in its raw form, a ring featuring the gemstone, and a close-up of the gem's crystalline structure. The poster also contains text in black against a white background, outlining information about the gemstone's physical properties, care, and significance. The text includes the following: * **Caring for this Gem:** * **Treatment:** Heated to improve and stabilize colour * **Care:** No special care * **Cleaning:** Warm, soapy water. Avoid ultrasonic and steam cleaning * **The Basics:** * **Hardness:** 6.5-7 * **Mineral Family:** Zoisite * **Crystal System:** Orthorhombic * **Why We Love This Gem:** * Tanzanite, a truly exquisite gem, is exclusively found in a single location worldwide. * Tanzanite is estimated to be 1000 times rarer than diamonds. * The remarkable rarity of Tanzanite has promoted guesses to predict that the sole known source will be depleted within our lifetime, making it the gemstone of our generation. * The significant demand for this gem led to its official inclusion in the birthstone list in 2002, representing the month of December. This marked the first addition to the list in over 90 years since 1912. * **Chemical Formula:** Ca2Al3(SiO4)3(OH) * **Composition:** Calcium Aluminum Silicate * **Specific Gravity:** 3.1-3.4 * **Optical Properties:** * **Colour:** Blue to violet, but other colours can be green, yellow, or pink * **Lustre:** Vitreous * **Refractive Index:** 1.67 to 1.70 * **Transparency:** Transparent in Zanzibar, Tanzania

$The image shows an informational poster about the Tanzanite gemstone. The poster is mounted in a white frame on a white wall. It is situated in a shop or exhibition space in Stone Town, Zanzibar, Tanzania, with a location indicated by coordinates -6.162 latitude and 39.187 longitude. The poster features a large, circular image of a Tanzanite gemstone in the center, surrounded by smaller, circular images of the gem in its raw form, a ring featuring the gemstone, and a close-up of the gem's crystalline structure. The poster also contains text in black against a white background, outlining information about the gemstone's physical properties, care, and significance. The text includes the following: * **Caring for this Gem:** * **Treatment:** Heated to improve and stabilize colour * **Care:** No special care * **Cleaning:** Warm, soapy water. Avoid ultrasonic and steam cleaning * **The Basics:** * **Hardness:** 6.5-7 * **Mineral Family:** Zoisite * **Crystal System:** Orthorhombic * **Why We Love This Gem:** * Tanzanite, a truly exquisite gem, is exclusively found in a single location worldwide. * Tanzanite is estimated to be 1000 times rarer than diamonds. * The remarkable rarity of Tanzanite has promoted guesses to predict that the sole known source will be depleted within our lifetime, making it the gemstone of our generation. * The significant demand for this gem led to its official inclusion in the birthstone list in 2002, representing the month of December. This marked the first addition to the list in over 90 years since 1912. * **Chemical Formula:** Ca2Al3(SiO4)3(OH) * **Composition:** Calcium Aluminum Silicate * **Specific Gravity:** 3.1-3.4 * **Optical Properties:** * **Colour:** Blue to violet, but other colours can be green, yellow, or pink * **Lustre:** Vitreous * **Refractive Index:** 1.67 to 1.70 * **Transparency:** Transparent$

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May 2, 2025, 12:38 PM

Zanzibar, Tanzania

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The image shows an informational poster about the Tanzanite gemstone. The poster is mounted in a white frame on a white wall. It is situated in a shop or exhibition space in Stone Town, Zanzibar, Tanzania, with a location indicated by coordinates -6.162 latitude and 39.187 longitude. The poster features a large, circular image of a Tanzanite gemstone in the center, surrounded by smaller, circular images of the gem in its raw form, a ring featuring the gemstone, and a close-up of the gem's crystalline structure. The poster also contains text in black against a white background, outlining information about the gemstone's physical properties, care, and significance. The text includes the following: * **Caring for this Gem:** * **Treatment:** Heated to improve and stabilize colour * **Care:** No special care * **Cleaning:** Warm, soapy water. Avoid ultrasonic and steam cleaning * **The Basics:** * **Hardness:** 6.5-7 * **Mineral Family:** Zoisite * **Crystal System:** Orthorhombic * **Why We Love This Gem:** * Tanzanite, a truly exquisite gem, is exclusively found in a single location worldwide. * Tanzanite is estimated to be 1000 times rarer than diamonds. * The remarkable rarity of Tanzanite has promoted guesses to predict that the sole known source will be depleted within our lifetime, making it the gemstone of our generation. * The significant demand for this gem led to its official inclusion in the birthstone list in 2002, representing the month of December. This marked the first addition to the list in over 90 years since 1912. * **Chemical Formula:** Ca2Al3(SiO4)3(OH) * **Composition:** Calcium Aluminum Silicate * **Specific Gravity:** 3.1-3.4 * **Optical Properties:** * **Colour:** Blue to violet, but other colours can be green, yellow, or pink * **Lustre:** Vitreous * **Refractive Index:** 1.67 to 1.70 * **Transparency:** Transparent

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