Single earring with gold and sparkling crystals. - Design: Gold post with crystal combination; silicone backing - Stone shape: Single crystal - Stone color: Transparent with an iridescent shine - Earring style: Dangle type, single earring - Material: Unknown Thank you for viewing. I initially thought everything was 18k gold because the earring had an 18k gold backing, but I couldn't find any markings on the post. I also lost the original backing, so I've replaced it with a silicone one I had at home. I really loved this earring, but I can't wear it anymore since I lost one. I'm putting it up for sale. Thank you.