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ULTRA Diamonds was a seller of fine jewelry in factory outlet and value centers in the United States. ULTRA was a manufacturer as well as a direct importer of diamonds, gemstones, and gold jewelry. At one point, Ultra operated over 100 stores in outlet centers and 38 other format locations (primarily licensed jewelry departments).
In 2012, Signet acquired ULTRA Diamonds [8] and converted most of ULTRA stores to Jared Vault & Kay Jewelers Outlets. [9] In February 2014, Signet Jewelers Ltd. agreed to buy Zale Corporation, with Zale shareholders receiving USD$21 a share in cash in USD$1.4 billion deal. [10] This merger created a $6.2 billion firm. [10]
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
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Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within Earth's mantle . Formation occurs at depths between 150 and 450 kilometres (93 and 280 mi), potentially from anomalously enriched exotic mantle compositions, and they are erupted rapidly and violently, often ...
The Carine Diamond is the eighth-largest diamond found in the Crater of Diamonds since it became a state park in 1972, according to the news release. On average, park visitors find one or two ...
Lonsdaleite (named in honour of Kathleen Lonsdale), also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice, as opposed to the cubical lattice of conventional diamond.
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