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Here we offer another fres"h estate find:

Vintage Solid 14K White Gold Unmounted, Semi-Mount Ring for Half-Drilled Pearl 
Size 5.75
Front Measures 12mm wide
Band 2mm wide
Pre-owned Stamp looks like U Pt - Not hallmark 14K but holds 14k acid strong. Might be Platinum. I do not have a test for platinum. We guarantee to be 14k gold or platinum.
Not sure but looks like it is for a 7mm pearl.
Solid 14K White Gold Unmounted, Semi-Mount Ring setting specifically designed to showcase a Half-Drilled Pearl or round cabochon gemstone
Unmounted, semi-mount ring setting specifically designed to showcase a half-drilled pearl or round cabochon gemstone. Features Center Peg, The prominent vertical metal post in the center is a core feature for secure pearl mounting. A jewelry craftsman applies a strong adhesive (like epoxy) to this peg before sliding a half-drilled pearl down onto it. Ornate Cup Base: The decorative, petal-like decorative base provides a supportive seat or "cup" that frames and stabilizes the bottom curve of the round pearl. Outer Prongs: The metal prongs flanking the cup can be gently bent over the shoulders of the pearl to provide additional structural protection and security.
Approximate 3.1 Grams 
Lot 1554C
ESTATE FOUND