Sterling and fine silver, 24K gold, boulder opal:  Soft blues and purples run through these solid Australian Boulder opals and dangle from multi dimensional tops (the piece with the wave is lifted off the back part of the earring) giving these a really nice sculptural look, fused with 24K gold foil in a Japanese process called Keumboo.  5/8" wide by 2-1/4" long from the post.  

Opal Drop Earrings