One pair of handmade 8 mm, white raw opal sterling silver studs made with rough shaped Ethiopian opal on sterling silver posts with a 4 prong setting.
Opal is the birthstone for Octer. These opals are white with some color flashes with some of the black surrounding stone the rough opals were found in still attached.

These simple rough opal crystal studs are made with small 8 mm Ethiopian opals that are rough shaped and set in sterling silver 4 prong setting. The posts and push backs are stamped 925.
They are shown next to a US dime for scale..

Stone measurements: 5 x 8 x 6 mm

Thanks for looking.