DIAMOND, SAPPHIRE AND EMERALD RING, CIRCA 1925.
Set with an old European-cut diamond weighing approximately 1.00 carat within an oval frame decorated with swirls of French calibré-cut emeralds and sapphires, the shoulders accented with small old European-cut diamonds, mounted in platinum.
Designer and manufacturer unknown.
(Source: Stonefinder on Pinterest; invaluable; powelsfinejewelry)