This beauty is made of adventurine and sterling silver. Adventurine is thought to be the luckiest of all crystals especially in manifesting wealth and prosperity. It is a variety of quartz with segments of glimmering shiny mica which are most noticeable when polished. This necklace has a large flat oval in the center with a tear shaped drop. The chain is made of tested sterling silver and needs no clasp. The necklace measures 26 inches with a 3 1/2 inch pendant. The oval is 1 3/4 inches wide. It has a wonderful Art Deco style and I would say it is most likely an Asian creation from the 20's. Just beautiful! And lucky!