France, circa 1920s
This impressive antique platinum cluster ring featuring a bezel-set large blue opal, exhibiting strong play-of-color in blue and green hues. The opal is surrounded by a halo of chunky old mine cut diamonds (G color, SI clarity). The setting is finely crafted in platinum, with a closed-back bezel mount and millegrain detailing around the diamond cluster.
The opal measures 15 x 13 mm.
Estimated total diamond weight is 3.70 carats.
The opal and diamond cluster measures 25 x 23 mm (1 x 7/8 in.)
Weight is 17.21 grams
The ring is marked with dog’s head French assay mark for platinum, maker’s mark, and control / import mark for 950 platinum standard.
Ring size 7.75 (18 mm) resizable
