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Dimensions:

12.8 x 12.7 x 6.1

12.7 x 12.7 x 5.9

Tanzanite is a blue-violet variety of the mineral zoisite, known for its strong trichroism (exhibiting three colors), and is found only in the Merelani Hills of Tanzania.

Here's a more detailed description of tanzanite:

Mineral: Zoisite.

Color: Tanzanite is known for its blue-violet hues, but it can also display shades of blue, violet, and even burgundy depending on the crystal's orientation, a phenomenon called trichroism.

Discovery: Tanzanite was discovered in 1967 in the Merelani Hills of Tanzania, near Mount Kilimanjaro.

Rarity: It is a relatively rare gemstone, found in only one place on Earth.

Pleochroism/Trichroism: Tanzanite exhibits strong pleochroism, meaning it displays different colors when viewed from different angles.

Hardness: Tanzanite has a Mohs hardness of 6.5 to 7, making it relatively durable but still susceptible to scratches.

Heat Treatment: Tanzanite is often heat-treated to enhance its blue-violet color.

Tiffany & Co: Tiffany & Co. played a key role in bringing tanzanite to market, naming it and promoting its unique beauty.

Birthstone: Tanzanite is a birthstone for December.