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  2. Canadian Gold Maple Leaf - Wikipedia

    en.wikipedia.org/wiki/Canadian_Gold_Maple_Leaf

    The standard version has a weight of minimum 1 troy ounce (31.10 grams). Other sizes and denominations include 1 gram, 1 ⁄ 25 oz. ($0.50), 120 oz. ($1), 110 oz. ($5), 1 ⁄ 4 oz. ($10), and 1 ⁄ 2 oz. ($20). The Gold Maple Leaf's obverse and reverse display, respectively, the profile of Queen Elizabeth II of Canada and the Canadian ...

  3. American Gold Eagle - Wikipedia

    en.wikipedia.org/wiki/American_Gold_Eagle

    The 110, 1 ⁄ 4, and 1 ⁄ 2 troy oz coins are identical in design to the 1 troy oz coin except for the markings on the reverse side that indicate the weight and face value of the coin (for example, 1 OZ. fine gold~50 dollars). The print on the smaller coins is, therefore, finer and less legible than on larger denominations.

  4. Wheat and chessboard problem - Wikipedia

    en.wikipedia.org/wiki/Wheat_and_chessboard_problem

    The problem may be solved using simple addition. With 64 squares on a chessboard, if the number of grains doubles on successive squares, then the sum of grains on all 64 squares is: 1 + 2 + 4 + 8 + ... and so forth for the 64 squares. The total number of grains can be shown to be 2 64 −1 or 18,446,744,073,709,551,615 (eighteen quintillion ...

  5. Gold-filled jewelry - Wikipedia

    en.wikipedia.org/wiki/Gold-filled_jewelry

    If the gold layer is 12 kt or higher, the minimum layer of karat gold in an item stamped gold-filled marks must equal at least 1 ⁄ 20th the total weight of the item. The most common stamps found on gold-filled jewelry are 1 ⁄ 20th 12kt GF and 1 ⁄ 20th 14kt GF. Also common is 1 ⁄ 10th 10kt. These standards are for modern gold-filled items.

  6. Tola (unit) - Wikipedia

    en.wikipedia.org/wiki/Tola_(unit)

    The tola ( Hindi: तोला / Urdu: تولا, romanized : tolā; also transliterated as tolah or tole) is a traditional Ancient Indian and South Asian unit of mass, now standardised as 180 grains ( 11.6638038 grams) or exactly 3⁄8 troy ounce. It was the base unit of mass in the British Indian system of weights and measures introduced in ...

  7. Sovereign (British coin) - Wikipedia

    en.wikipedia.org/wiki/Sovereign_(British_coin)

    The sovereign is a British gold coin with a nominal value of one pound sterling (£1) and contains 0.2354 troy oz of pure gold. Struck since 1817, it was originally a circulating coin that was accepted in Britain and elsewhere in the world; it is now a bullion coin and is sometimes mounted in jewellery. In addition, circulation strikes and ...

  8. Mina (unit) - Wikipedia

    en.wikipedia.org/wiki/Mina_(unit)

    Mina (unit) Measurement of ½ mina (actual weight 248 grams), a weight standard established by the Sumerian king Shulgi. It has a crescent image; used in the temple of the god Sin in Ur, diorite, 6.2 by 4.5 centimetres (2.4 in × 1.8 in), early 21st century B.C. (III dynasty of Ur).

  9. Chinese Gold Panda - Wikipedia

    en.wikipedia.org/wiki/Chinese_Gold_Panda

    Through 2015, these corresponded with 1, 1 ⁄ 2, 1 ⁄ 4, and 110 ozt (31.1, 15.6, 7.8, and 3.1 g) of gold, respectively. An exception was 1991, when 1-gram Gold Pandas were minted, issued in the denomination of 3 yuan. 2015 was the only year that the Gold Panda did not have any denomination imprinted on the coin.