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Fine black crystal opal, Paraiba blue tourmaline and diamond ring Centering one oval cabochon black crystal opal measuring

Fine black crystal opal, Paraiba blue tourmaline and diamond ring Centering one oval cabochon black crystal opal measuring approximately X mm, weighing cts., surrounded by round cut Paraiba blue tourmalines weighing a total of cts

Art Deco Platinum, Black Opal, and Diamond Ring, set with an oval cabochon black opal measuring approx. 13.20 x 10.70 x 3.40 mm, framed by single-cut diamond melee, millegrain and engraved accents, size 5 1/2, maker's mark.

Art Deco Platinum, Black Opal, and Diamond Ring, set with an oval cabochon black opal framed by single-cut diamond melee, millegrain and engraved accents

Océane ring White gold Diamonds Wollo opals Paraiba tourmalines

Mathon Paris 'Océane' ring in White gold with Diamonds, Wollo opals and Paraiba tourmaline.

Platinum Black Opal and Diamond Art Deco Ring, A magnificent and mesmerizing Lightening Ridge black opal, shimmers and glows a complete palette of electric colors, fills the center of this chic, Art Deco ring. This enchanting jewel is finely handcrafted in platinum, circa 1925, and is set with a sparkling array of small round, baguette and bullet-shape diamonds.

A magnificent and mesmerizing Lightening Ridge black opal, shimmers and glows a complete palette of electric colors, fills the center of this chic, Art Deco ring. This enchanting jewel is finely handcrafted in platinum, circa and is set with a spar

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