Heat treatment removes undesirable brown hues, leaving this gem a bright, pure blue. Photo courtesy of liveauctioneers.com and Avis Diamond Galleries.
Blue Tanzanite (Zoisite) Faceted, Heat-Treated in Ring from Tanzania
Heat treatment removes undesirable brown hues, leaving this gem a bright, pure blue. Photo courtesy of liveauctioneers.com and Avis Diamond Galleries.
Article: Common Gemstone Treatments Cheat Sheet
Credit: <span class="sellerName___29phr">Avis Diamond Galleries</span>
| Gemstone | Tanzanite (Zoisite), Zoisite |
| Treatments | Heat Treatment |
| Natural or man made | Natural |
| Origin | Tanzania |
| Jewelry type | Ring |
| Gem State | Faceted |
| Color | Blue |
| Transparency | Transparent |