This is an Exceptional Rock Crystal Brooch/Pin. This is a real Beauty ! The Dimensions of the Piece are 2" by 1 1/8" . It is unmarked, however is likely low carat Gold. There is 27 approximately 3 Millimeter stones and 3 Larger ones in the center , the largest being about 8 & 1/2 Millimeter. It has a few very tiny scratches, only visible with a magnifying loop, on the largest stone in the middle. It has a safety lock on the pin which we are sure was added at a later date. There are 2 small loops where the piece may have been part of a larger ensemble ( maybe a Necklace ) The stones are all very bright and clear !