Druzy amethyst. Sparkle like a dream :) about 3x2. Flat back. Coated on top, natural on bottom.
This was a personal piece I had in my collection for two years. Lots of texture and color coming from this treated stone.
All of the auras in my shop are treated with platinum to give the rainbow colors. The stones themself start off natural. The coating does not rub off these.
Best to store out of direct sunlight.