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  2. Oscar Heyman & Brothers - Wikipedia

    en.wikipedia.org/wiki/Oscar_Heyman_&_Brothers

    Oscar Heyman & Brothers produced jewelry for 20th century retailers such as Black, Starr & Frost, Udall & Ballou, Marcus & Co, J.E. Caldwell & Co, [14] Laykin et Cie, and Shreve, Crump & Low. The firm produced invisibly set jewelry made in New York for Van Cleef & Arpels from 1939 – 2001, up until the time the Richemont Group acquired a ...

  3. Rubellite - Wikipedia

    en.wikipedia.org/wiki/Rubellite

    Rubellite is the red or pink variety of tourmaline and is a member of elbaite. Rubellite is also the rarest gem in its family. [2] It is occasionally mistaken for ruby. [3] These gems typically contain inclusions. [4] Notable countries where rubellite can be mined include Afghanistan, Brazil, Madagascar, Myanmar, Nigeria, Russia, and the United ...

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Paraiba Tourmaline has become one of the most popular gemstones in recent times thanks to its color and is considered to be one of the important gemstones after rubies, emeralds, and sapphires according to Gübelin Gemlab. Even though it is a tourmaline, Paraiba Tourmaline is one of the most expensive gemstones. [31]

  5. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    An excellent example of watermelon tourmaline jewelry is a brooch piece (1969, gold, watermelon tourmaline, diamonds) by Andrew Grima (British, b. Italy, 1921–2007), in the collection of Kimberly Klosterman and on display at the Cincinnati Art Museum. [19] Some forms of tourmaline are dichroic; they change color when viewed from different ...

  6. Petra Diamonds - Wikipedia

    en.wikipedia.org/wiki/Petra_Diamonds

    Petra Diamonds Ltd is a diamond mining group headquartered in Jersey.Petra own one of the world's most productive mines historically, the Cullinan Diamond Mine is famed for having produced the world's largest rough and polished diamond.

  7. Sarine (company) - Wikipedia

    en.wikipedia.org/wiki/Sarine_(company)

    Sarine Technologies Ltd is a publicly traded company that develops, produces and sells technologies for the diamond industry, including devices for the planning, analysis and grading of rough and polished diamonds. [1] Company headquarters are located in Hod Hasharon, Israel.

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