Black and White Diamond Firefly Necklace Crafted In Solid Sterling Silver, 18 Inches All purchases from SuperJeweler come with The SuperJeweler Lifetime Guarantee. Your SuperJeweler jewelry purchase includes a lifetime guarantee against the loss of side stones or damage to the jewelry's setting or center stone. It also includes a one-year replacement guarantee against the loss of your jewelry's center stone. SuperJeweler offers free shipping in the United States, Canada, the United Kingdom, Australia and almost every country. Natural black diamonds are rare. SuperJeweler sells only heat treated black diamonds, treated with the High Pressure Heat Treatment (HPHT) method. In HPHT treatment, poor quality diamonds are heated to approximately 1260 degrees, and the diamonds become black. HPHT treatment is completely safe. Black diamonds from SuperJeweler have varying numbers of facets from 0 to 16 are not considered gem quality diamonds. All diamonds are rare, natural minerals. The semi-faceted diamonds in this item are natural. SuperJeweler's diamonds in our inexpensive jewelry are beautiful and safe to wear. The diamonds in this jewelry item are of not of gem quality, and contain from 0 to 16 facets.