Sterling Silver Charcoal Jade and Diamond Circle Pendant Necklace on Chain, 18" Gemstones may have been treated to improve their appearance or durability and may require special care. The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture Jade is commonly treated and impregnated with polymers to enhance its color and improve its stability. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Imported