In the Loupe: Tanzanite Gemstone

Found in just one place on earth, tanzanite is a relatively recent discovery compared to most precious gemstones, first found in 1967.

The determining factors of a tanzanite's value are by colour, clarity, cut and carat weight. The colour of a tanzanite has the most significance on a tanzanite's value. Deep saturated violet blue or blue violet are the most valuable tanzanite colours. Paler hues are more commonly found.

Specifications

Tanzanite are from the Zoisite mineral family and have a Mohs hardness rating of 6 to 7. There are a number of processes used to alter the colour, apparent clarity, or improve the durability of the tanzanite. The vast majority of tanzanite on the market today is heat-treated to enhance its colour.

Sources

Tanzanite was given it's name by Tiffany & Co who named this blue-violet variety of zoisite in honour of Tanzania, where it was first found in the foothills of Mount Kilimanjaro in 1967. Today, tanzanite can only be found in the Merelani Hills of Tanzania.

Birthstones and Anniversaries

As a testament to the popularity of tanzanite, in 2002 tanzanite became adopted as a new birthstone for December by the American Gem Trade Association (AGTA). Tanzanite represents the 24th year wedding anniversaries.

View some of our tanzanite jewellery ring designs.