Diamond chip heart pendant 925 necklace

Pendant and necklace are in good condition and kept in a clean smoke free home. Pendant has two diamond chips as you can see two holes on the back. The rest is diamond illusion. Pendant is 20 mm X 18 mm triple heart stacked. The markings are hard to see. Looks like U D which could be short for universal denomination which replaces 925. I cannot find 925. The other marking I am not sure. Possibly B R. The diamonds were tested with a presidium II gemstone tester and tested as diamonds so we know it is at least silver. Necklace is 17” and brand new. I paired it with the pendant. The pendant has a nice silver color and they go nice together. #925 #diamondpendant #diamondjewelry