Sterling Silver and Cubic Zirconia Polished Heart Necklace - 18 Inch - in Sterling Silver - Product Attributes: - 2 Inch extension - Lobster Claw Closure - Gift ready jewelry box included - Measures 22.55mm Wide - Charm/Element Width: 22.55 mm - Width of Item: 22.55 mm - Charm/Element Length: 31.5 mm - Length of Item: 20 in - Chain Length: 18 in - Chain Width: 1 mm - Clasp /Connector: Lobster - Finish: Polished - Chain Type: Snake - Extender Length: 2 in - ::: [ 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. :::