1/4ct Triple Black Diamond Ring Crafted In Solid Sterling Silver Natural black diamonds are rare. SuperJeweler sells only heat treated black diamonds, treated with the High Pressure Heat Treatment (HPHT) method. In HPHT treatment, poorquality diamonds are heated to approximately 1260 degrees,and the diamonds become black. HPHT treatment is completely safe, and produces gem quality black diamonds. Black diamonds from SuperJeweler have varying numbers of facets from 0 to 16. Black diamonds are not considered gem quality diamonds. SuperJeweler offers free shipping in the United States, Canada, the United Kingdom, Australia and almost every country. 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.