This is a rare gorgeous natural phosphosiderite (it's called 'lovers stone' in Japan) round disc dome cabochon with nice lilac purple color. It measures approx. 20X7mm. I have encased it in sterling silver and soldered it to a nice thick sterling ring band with a hand stamped swirl pattern. This ring is a size 7. All metal is sterling (92.5% silver) and has been lightly oxidized for a lovely antique finish. Please contact me with any questions. Thank you!