Lot 205. Platinum, Colombian Emerald and Diamond Brooch, Marianne Ostier. Estimate 175,000 — 275,000 USD. Photo Sotheby's. The round hollow-back mixed-cut emerald measuring approximately 21.3 to 20.9 mm by 9.6 mm, framed by pear and marquise-shaped diamonds...

A suite of diamond, turquoise, lapis lazuli and gold jewelry, by Marianne Ostier. Photo: Christie's Images Ltd 2013 Comprising a necklace, designed as a V-shaped cluster of sculpted gold plaques, set with oval cabochon turquoise and lapis lazuli, interspersed...

Cultured pearl and diamond flower brooch, Marianne Ostier, circa 1950 Designed as two flowers on curling stems, the larger set with a drop-shaped cultured pearl measuring approximately 15.0 by 13.0 mm., the petals pavé-set with numerous round diamonds,...