This is one of the peices I've been working on that includes stones that I bought from a fellow artist at a "swap meet / flea market" for artists and art supplies. It was a fun day and I came away with a bunch of stones, some of which I don't even know what they are.  However I do know what this one is.  It's Charoite.  It comes from one place in Russia.

"It is a fairly recent discovery found in Russia in 1978 in the Murun mountains in Yakutia, near the Charo River. This is the only known location for this rare mineral. It ranges in color from a light lilac to a deep purple and can be mottled with gray, white and black inclusions. The chatoyant variety in a bright deep purple, is usually considered more valuable than the non-chatoyant variety although both are used in jewelry and compliment a number of other stones." from bernardine

 This is the domed side of a

 a 2 sided pendant

This big pendant is back set meaning the bezel was folded over the stone from the back and the "seat" that the flat side of the stone would sit on is now on the front   This makes this piece wearable either way