Bertrandite is more commonly called Tiffany Stone. It has also been called Purple Passion and Icecream Opal. Tiffany stone is a common opal. Tiffany stone is generally opaque but can be translucent. Tiffany stone gets it's wonderful purple colors from Fluorite.
Tiffany Stone comes from the Brush Wellman Beryllium mine in Utah. The mine is no longer open for collecting and all of this beautiful material is now ground up as beryllium ore.
Tiffany stone can have some uneven hardness (undercutting). However most Tiffany stone cuts easily and takes a fine polish. with a mohs hardness of 5 to 6.
The tiffany Stone pendant is 25mm (1") the amethyst a nice bright deep purple it is 5mm There is a small pocket on the back side caused by a soft spot We are reducing the price from $200 to $150. Doesn't look like it will chip out any further.Chain not included.