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2. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   Untreated tanzanite is a trichroic gemstone, meaning that light that enters this anisotropic crystal gets refracted on different paths, with different colour absorption on each of the three optical axes. As a result of this phenomenon, a multitude of colors have been observed in various specimens: shades of purple, violet, indigo, blue, cyan ...

3. List of jewellery types - Wikipedia

   en.wikipedia.org/wiki/List_of_jewellery_types

   This page was last edited on 25 December 2024, at 14:17 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

4. Turquoise - Wikipedia

   en.wikipedia.org/wiki/Turquoise

   The mine chose to send all ore to the crusher and to concentrate on copper production due to the rising price of copper on the world market. The price of natural untreated Sleeping Beauty turquoise has risen dramatically since the mine's closing. The Kingman Mine as of 2015 still operates alongside a copper mine outside of the city. Other mines ...

5. Zoisite - Wikipedia

   en.wikipedia.org/wiki/Zoisite

   Zoisite may be blue to violet, green, brown, pink, yellow, gray, or colorless. Blue crystals are known under the name tanzanite. It has a vitreous luster and a conchoidal to uneven fracture. When euhedral, zoisite crystals are striated parallel to the principal axis (c-axis). Also parallel to the principal axis is one direction of perfect cleavage.

6. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   When jewelry containing sapphires or rubies is heated, those stones should not be coated with boric acid (which can etch the surface) or any other substance. They do not have to be protected from burning, like a diamond (although the stones do need to be protected from heat stress fracture by immersing the part of the jewelry with stones in the ...

7. It’s high season in Thailand. Avoid the crowds by visiting ...

   www.aol.com/news/high-season-thailand-avoid...

   Located in northern Thailand about an hour’s drive from the city of Chiang Mai, Chiang Dao is an ideal escape for those looking for beautiful views with a side of adventure.