Gemstone Type : Ruby and Diamond. Gold & Platinum Purity Reference :9ct = 375 = 9k = 9kt 10ct = 417 = 10k = 10kt 14ct = 585 = 14k = 14kt 15ct = 625 = 15k = 15kt 18ct = 750 = 18k = 18kt Platinum = 950 = PT950 = Plat.
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