France, circa 1950s.

This vintage platinum engagement ring of a classical cluster design features a cushion shaped natural unheated Ceylon sapphire of royal blue color. The sapphire is set in 18K yellow gold bezel and surrounded by bright white brilliant cut diamonds (G-H color, VS1 clarity).

Weight of the sapphire is 3.54 cts.

Estimated total diamond weight is 0.72 ct.

Marked with the eagle’s head assay mark for 750 gold standard, the dog’s head mark for 950 platinum standard, and maker’s mark.

The ring is accompanied by the American Gemological Laboratories Prestige gemstone report No. 1116248 for the sapphire.

The sapphire and diamond cluster measures 17 x 15 mm (11/16 x 5/8 in.)

Ring size 7 (17 mm) resizable