Diamond in 9k White Gold Tongue & Box Necklace Clasp Findings Vintage Art Deco c1920.
The gold mark can be found to the rear, this is simply reads '9ct'. The diamond has been tested as real, it is in good order. Good secure clasp.
Size 1.8 x 1.5 cm or 0.7 x 0.6 inches.
Weight 0.7 grams or 0.4 penny weight.