14k 4mm Synthetic Ruby (Jul) Screw-Back Earrings - Measures 4x4mm - in 14k Yellow Gold - Product Attributes: - Polished - Screw back - Post Earrings - Synthetic - Width of Item: 4 mm - Length of Item: 4 mm - Earring Closure: Post & Screw Back - Earring Type: Birthstone - Finish: Polished - Feature: Solid - Feature 2: Nickel Free Polished ; Post Earrings ; Screw back ; Synthetic - All of our jewelry for women and men are authenticated with a 10K or 14K hallmark and are tested to pass FTC regulations. ::: [ Potential Enhancement Methods: ruby ] - Almost all rubies are lead-glass filled. Surface cavities and fractures are filled with glass and glass-like substances that contain lead. Also, rubies usually have been heated to improve appearance and some may be diffused to enhance color. ::: [ Care and Handling: ruby ] - Avoid strong detergents, heat, pressure and ultrasonic cleaner or steamer. Avoid re-polishing or re-cutting of the stone. Color may fade in light or with heat. Clean with warm soapy water and a soft brush or cloth. :::