A CABOCHON EMERALD AND DIAMOND FOLIATE BROOCH, SCHLUMBERGER, TIFFANY & CO.

Details
A CABOCHON EMERALD AND DIAMOND FOLIATE BROOCH, SCHLUMBERGER, TIFFANY & CO.
Set with an oval cabochon emerald measuring approximately 8.00 x 7.00 x 6.50 mm, within a circular and marquise-cut diamond foliate spray frame, mounted in platinum and 18K gold, with French hallmarks
Signed by Schlumberger, Tiffany
Literature
For an illustration of a similar brooch see:

John Loring, "Tiffany's 20th Century", Harry N. Abrams, Inc., New York, 1997, p. 155