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  2. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1⁄4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference. The relationship of this size ( ) to ISO 8653:2016 circumference ( ) is , while the relationship to ...

  3. Material properties of diamond - Wikipedia

    en.wikipedia.org/wiki/Material_properties_of_diamond

    Material properties of diamond. Burns above 700 °C in air. Diamond is the allotrope of carbon in which the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. It is a crystal that is transparent to opaque and which is generally isotropic (no or very weak birefringence).

  4. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Diamond[a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...

  5. Diamond - Wikipedia

    en.wikipedia.org/wiki/Diamond

    Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond as a form of carbon is a tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of electricity, and insoluble in water. Another solid form of carbon known as graphite is the chemically stable ...

  6. List of largest rough diamonds - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_rough_diamonds

    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.

  7. Uncle Sam (diamond) - Wikipedia

    en.wikipedia.org/wiki/Uncle_Sam_(diamond)

    The company described those diamonds as being so hard that they could only be cut using powder of other Arkansas diamonds. [4] The final result was a 12.42-carat (2.484 g) emerald-cut gem. It was characterized as M on the diamond color scale; this nominally corresponds to a faint yellow color, but the visual impression of Uncle Sam has been ...

  8. Hope Diamond - Wikipedia

    en.wikipedia.org/wiki/Hope_Diamond

    Jean-Baptiste Tavernier. Owner. Smithsonian Institution. Estimated value. US$200–350 million. The Hope Diamond is a 45.52 carats (9.104 g; 0.3211 oz) diamond that has been famed for its great size since the 18th century. Extracted in the 17th century from the Kollur Mine in Guntur, India, [ 1 ][ 2 ] the Hope Diamond is a blue diamond.

  9. Princess cut - Wikipedia

    en.wikipedia.org/wiki/Princess_cut

    Princess cut diamond set in a ring. The princess cut (technical name 'square modified brilliant') is a diamond cut shape often used in engagement rings. The name dates back to the 1960s, while the princess cut as it exists was created by Betazel Ambar, Ygal Perlman, and Israel Itzkowitz in 1980. The cut has a square or rectangular shape when ...

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