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  2. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    1.24 g 1794–1873 Dollar 15 mm 1.67 gr 1849–1889 $5 American Gold Eagle 16.5 mm 3.11 g 1986–present $10 American Platinum Eagle 16.5 mm 3.11 g 1997–present Three Cent 17.9 mm 1.94 g 1865-1889 Dime (Clad) 17.91 mm 2.268 g 1965–present Dime 17.9 mm 2.5 g 1796–1964 $2.50 Gold Quarter Eagle 18 mm 4.2 g 1796–1929 Small Cent 19.05 mm 2.5 ...

  3. Jewelry Television - Wikipedia

    en.wikipedia.org/wiki/Jewelry_Television

    Jewelry Television is an American television network specializing in the sale of jewelry. On-air and online, the network is mainly branded by its jtv initials in lower-case letters. It has an estimated reach of more than 80 million U.S. households, through cable and satellite providers, online streaming and limited over-the-air broadcasters. [1]

  4. Landolt C - Wikipedia

    en.wikipedia.org/wiki/Landolt_C

    [1] The stroke width is 1 ⁄ 5 of the diameter, and the gap width is the same. [2] This is identical to the letter C from a Snellen chart. The Landolt C is the standard optotype for acuity measurement in most European countries. It was standardized, together with measurement procedures, by the German DIN, as DIN 58220 (now EN ISO 8596).

  5. Fineness - Wikipedia

    en.wikipedia.org/wiki/Fineness

    For example, copper is added to the precious metal silver to make a more durable alloy for use in coins, housewares and jewelry. Coin silver, which was used for making silver coins in the past, contains 900 ‰ silver and 100 ‰ copper, by mass. Sterling silver contains 925 ‰ silver and 75 ‰ of other metals, usually copper, by mass.

  6. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]

  7. Moissanite - Wikipedia

    en.wikipedia.org/wiki/Moissanite

    A moissanite engagement ring Moissanite: emerald cut. Moissanite was introduced to the jewelry market as a diamond alternative in 1998 after Charles & Colvard (formerly known as C3 Inc.) received patents to create and market lab-grown silicon carbide gemstones, becoming the first firm to do so. By 2018 all patents on the original process world ...

  8. Sterling silver - Wikipedia

    en.wikipedia.org/wiki/Sterling_silver

    The first legal definition of sterling silver appeared in 1275, when a statute of Edward I specified that 12 troy ounces of silver for coinage should contain 11 ounces 2 + 1 ⁄ 4 pennyweights of silver and 17 + 3 ⁄ 4 pennyweights of alloy, with 20 pennyweights to the troy ounce. [11] This is (not precisely) equivalent to a millesimal ...

  9. Argentium sterling silver - Wikipedia

    en.wikipedia.org/wiki/Argentium_sterling_silver

    Argentium silver (patented in 1998) [1] is a brand of modern tarnish-resistant silver alloys, containing either 93.5%, 94% or 96% silver.Argentium alloys replace some of the copper in the traditional sterling silver (92.5% silver + 7.5% copper) with the metalloid germanium.

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