Grandview Klein Diamonds and London Jewelers have revealed a 63-carat rough diamond they will transform into a 20.26-carat polished stone to mark London Jewelers’ 100th anniversary. The companies showcased the rough diamond at a private event during JCK Las Vegas on May 29, Grandview Klein said last week. The dealer will cut the stone into an old mine cushion-cut, D-flawless diamond. A D-flawless natural diamond is among the rarest gemstones, co…
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