We have made dozens of these pebble necklaces over the years. It is a fun way to set stones and use up gold or silver. Take a torch to metal and it naturally forms into this shape. This particular incarnation is a .40 point brilliant cut diamond set into 14k yellow gold. The pendant moves freely on an oxidized sterling silver cable chain.
Pairs well with station necklaces.
Excellent use of a diamond that you don't want to wear on your finger.