This 2 1/2 x1 1/4 inch pin is loaded with features. Marked sterling AND 925 just to be sure, also says Made Mexico and PGC. The 925 has an unknown mark (to me) and an upside down F at the end. The abalone diamonds are set in silver filigree and then a poured substance (tortoise?) smoothly covers all. Safety Clasp, excellent condition.