1 ct Created Opal and 1/6 ct Swiss Blue Topaz Pendant Necklace with Diamonds in Sterling Silver 1 ct Created Opal 1/6 ct Swiss Blue Topaz Round-Cut Diamonds Crafted in Sterling Silver Measures 3/4 by 1/2 Inches All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.