The sky's ever-changing blue hues, caught in an earring that feels like something you'd pull from a vintage jewelry box. The Bijoux Flat Back Stud in Blue is a vivid cluster of faceted blue stones. Vibrant, eclectic, and timeless. This listing is for a single ASTM F136 implant grade titanium push-pin flat back stud. MEASUREMENTS: Post Gauge: 18G (1mm) also fits most 16-20G threadless labret posts Post Length: 1/4 inch (6mm), with a 4mm disc on back Front Design: approx. 4.7 x 4.9 mm Please see listing photos to get a sense of the size of the stud on-ear. We also recommend that you check your own ear measurement before ordering. MATERIALS: ASTM-F136 Titanium 18K PVD Gold Plating Zirconia CARE: Water and tarnish proof with proper care. If exposed to salt water, chlorine, or lotions/perfumes, rinse off with cool-warm water and gently dry. When not wearing, store in a dry, cool place. Do not pull, twist, or tug on your jewelry.