These are estate pieces with very unique color combinations. The jeweler that cleaned it for me said the center stone is Ethiopian opal. For this type of opal, the stone has a decent amount of "fire" to it! It's surrounded by muti-colored tourmaline stone. Size 10. The accompanying bracelet mirrors the tourmalines in the ring. 7" length, set in 925 silver. They look beautiful together. Or keep one for yourself, and gift the other!