Both the heart and the key are marked LINC 1/20 12K G. F.
The key has 2 rhinestones and the heart has 4 with one of those being a large center stone.
The rhinestones are an aqua color and 2 of the stones in the heart are not quite as bright as the others.
A very pretty and unusual piece.
The brooch is 3 in. long and 2 and 1/2 in. wide.
Thank you for looking.