Art Deco Platinum Engraved Onyx Pendant with Old European-Cut Diamonds

An Art Deco platinum rectangular onyx pendant with an engraved platinum border and Old European-cut diamond accents. Circa 1920.

Antique Collection
Center diamond: 0.85 carats, I-J color, I1 clarity
Accent diamonds: 0.30 carats, G-H color, VS1-VS2 clarity
Dimensions: 1 3/4 x 7/8 inches