Tiffany Stone (the purple form of Bertrandite) is a silica and/or calcium carbonate base predominately of opalite, and agate (chalcedony). Its purple color is caused by fluorine gases trapped in layers of silica-rich sediments of which makes the formation opalized, agatized, and/or with jaspers, cherts, and dolomite and sometimes all mixed together. Tiffany Stone, originally comes from the Brush Wellman Mine in Utah, now closed to collecting, however, in 2004 new high quality deposits were discovered and the Spor Lavender Mine promises more fine material in the coming years. It should be noted that premium grade Tiffany Stone is pricey. Many finished cabochons run from $60 to $100 a stone.

The best color is a rich, deep purple, but pinks, oranges, reds, whites, blacks, chalcedony-clear, and sometimes even greens may be found. If the patterning include splashes, swirls, streams, lacing, crackles, dendrites, plumes, etc., all the better. Generally, the more colors and patterns, the better the stone. Below are a few of the Tiffany Stones I have wrapped.