This is a very pretty large onyx bolo slide. The silver design around the onyx stone is beautiful. The slide is 1 1/2" across and 2" from top to bottom. The onyx stone is 1 1/4" x 1 7/8". It is in excellent pre-owned condition with some tarnishing on the back. It is marked sterling. There may be another mark but it is right at the edge of the bolo clip. It looks like Spencer but I am not sure!