Antique Tiffany so there's no hallmark, or it could have been polished off. ?Pendant is Platinum & 14K Gold, chain is sterling silver

Weight: 3.6 Grams
Stone: Approx 0.59 TCW (0.01-0.21 ct) Old Mine Cut Diamonds
Pendant: 39.0 x 13.7 mm
Length: 16.5 Inches
Hallmark: Platinum & 14K Gold Tested

ITEM #: BR-814-110422-10