"A" in a circle= Ana BeKoach Kabbalah Jewelry by: Eileen
A capital letter A inside a circle indicates the maker's mark of Ana Bekoach, Israeli Kabbalah jewelry. The pieces have heavy gold electroplate.
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Same by: Anonymous
I have a few estate pieces stamped 18kgp, followed by what looks like a capital a. Searching the world encyclopedia I found a makers mark to show that the ring is accompanied by a lozenge or barrel cut stone, which is true of one of the pieces, the other, not so much.