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18k Gold Over Sterling Silver Stud Earrings with Australian Opal

Vintage white Australian opal stud earrings. They are marked 18k, but are 18k gold over sterling silver. The opals are natural and solid. One has some internal crazing. It is stable. Earrings are 10mm long by 8mm. Together they weigh 2 grams. The stones have nice play of color.

Here is a little video of them in the sun: