Free worldwide shipping, please click: https://www.trendollajewelry.com/collections/earrings Tarnish-proof Water-proof Sleep / Nap-proof Create with 925 sterling silver or Medical Grade Titanium Safe for sensitive skin Wear it while working out showering Designed to wear 24/7 Opal is renowned for its symbolic meaning of protection and love, with many wearing the gemstone to achieve peace, good fortune and reproductive health. Our Blue Opal Flat Back Cartilage Earrings come in 16g, 18g and 20g bar gauges, as well as various bar types and lengths, all with a minimalistic, externally threaded design. Invest in your wellness today! These earrings also make a wonderful gift for a loved one, as opal is believed to possess healing powers. The luxurious blue color ensures they are on-trend and the various gauges, bar lengths, and types make them both comfortable and stylish. Product information: *Material: No-tarnish medical grade titanium / Hypoallergenic/ 18k gold plated/ AAA cubic zirconia *Front Size: 4.5mm*4.5mm *Bar length: 4mm / 6mm / 8mm / 10mm *Bar thickness: 16 gauge (1.2mm) / 18 gauga (1mm) / 20 gauga (0.8mm) *Bar types: Ball end / Flat back / Butterfly backing *Color: silver / gold / rose gold