We have made this bracelet up, using a repurposed antique transitional cut diamond and length of chain. We have added a handmade bezel setting and modern bolt ring clasp to make a stackable, wearable bracelet. 
Tested as 9ct gold 
Weight approx 2.65g 
Diamond 0.54ct, approx VS2 clarity. Tested as natural, earth mined diamond..
Bracelet length approx 7 3/4 inch
Chain width approx 3.7mm
Very good antique condition