These Aurora crystal earrings offer a simple yet glamorous impression. - Design: Aurora crystal earrings - Color: Multicolor (iridescent) - Material: K18 White Gold - Size: Small ★ Stone: 4mm ⭐ The backings are silicone. ★ Purchased at a jewelry store! ⭐ Disinfected with alcohol. ★ Originally, the earrings had backings, but I snagged them and lost both. The markings were on the silicone backings. Apparently, with older pieces, the markings can be on the backings instead of the posts. These were purchased at a jewelry store. Thank you for your understanding and purchase. Thank you for looking.