The boulder opal isn't screaming with flash but more than makes up for it with dreamy sky blue shades that go near royal at one edge and flow into soft greens. I've given it the full treatment! Lush, fringey-fringe going all the way around. Blue topaz, apatite, tsavorite garnet, green tourmaline, tanzanite (sometimes I think I add tanzanite to everything) on argentium silver headpins. The chain adjusts from 16 to 18 inches.