This Sterling Silver necklace features 1.76 ct. t.w. blue topaz and 0.012 ct. t.w. diamonds and measures 23.90-mm. length x 9.15-mm. width. Almost all gemstones have been treated to enhance their color and require special care. Imported Material & Care Blue Topaz & Diamond, Sterling Silver Clean with a soft bristle brush or cloth and warm soapy water. Use silver polishing cloth on silver items