Autism Sterling Silver Swarovski Charm Rubber (neoprene) Necklace. Genuine Sterling Silver & Swarovski Crystals: This is one simply stunning Autism awareness ribbon charm. It is genuine .925 sterling silver and has genuine multicolored Swarovski crystals embedded in the front. The crystals really sparkle and reflects light beautifully! This charm measures about 3/4 of an inch tall. Gram Weight: 1.1. 18 inch 2mm Rubber Necklace (unlike natural rubber, neoprene will not burn or tarnish silver). With .925 Sterling Silver ends and lobster clasps. Made in USA.