This yowah nut boulder opal pendant is handcrafted from 14K/20 gold filled wire and a yowah nut boulder opal cabochon (cab). I couldn’t decide which side of this stone I liked more,so this pendant is double-sided - you choose which side you want to wear it on.This yowah nut boulder opal doesn’t have the flashes of color normally associated with opals, but it has wonderful red, blue, and white patterns. 14K/20 gold filled wire is basically a tube of 14K gold with a jeweler’s wire down the center for flexibility. It wears well, does not tarnish, and has the same allergy reactions (or non-reactions) as 14K gold. Each of my cabochon pendants are "one-of-a-kind" and you are selecting the actual one you will be receiving. The chain is not included, but I do have a selection of chains if you need one. approximately 7/8" x 2 5/8" 22mm x 66mm 8mm bail