Sterling Silver 6.5mm Synthetic Ruby and Cubic Zirconia Stud Earrings - in Sterling Silver - Gift ready jewelry box included - Measures 7x7mm Wide - Width of Item: 7 mm - Length of Item: 7 mm - Earring Closure: Post & Push Back - Earring Type: Stud - Finish: Polished - Feature: Solid - ::: [ Potential Enhancement Methods: cubic zirconia ] - Synthetic. Some are covered with a product that makes the stone more durable. ::: [ Care and Handling: cubic zirconia ] - Clean with warm soapy water and a soft cloth. ::: ::: [ 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. :::