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2. Vienna Philharmonic (coin) - Wikipedia

   en.wikipedia.org/wiki/Vienna_Philharmonic_(coin)

   The gold Philharmonic has a fineness of 999.9 (often written 0.9999, ... This coin has a face value of 2,000 euros and a fine weight of 20 troy ounces or 622 grams ...

3. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   1 troy ounce of four nines fine gold (999.9) 999.999—six nines fine: The purest gold ever produced. Refined by the Perth Mint in 1957. [3] [4] 999.99—five nines fine: The purest type of gold currently produced; the Royal Canadian Mint regularly produces commemorative coins in this fineness, including the world's largest, at 100 kg. [5]

4. Nines (notation) - Wikipedia

   en.wikipedia.org/wiki/Nines_(notation)

   1 troy ounce of four nines fine gold (999.9) Nines are an informal logarithmic notation for proportions very near to one or, equivalently, percentages very near 100%. Put simply, "nines" are the number of consecutive nines in a percentage such as 99% (two nines) [1] or a decimal fraction such as 0.999 (three nines).

5. Gold coin - Wikipedia

   en.wikipedia.org/wiki/Gold_coin

   Gold coins for sale at the Dubai Gold Souk. A gold coin is a coin that is made mostly or entirely of gold.Most gold coins minted since 1800 are 90–92% gold (22‑karat), while most of today's gold bullion coins are pure gold, such as the Britannia, Canadian Maple Leaf, and American Buffalo.

6. Doré bar - Wikipedia

   en.wikipedia.org/wiki/Doré_bar

   Mint and private assayers would subsequently refine the doré bars to an acceptable purity, 999 fine, gold bullion, with the silver and base metals removed. By the time of the California gold rush , mints were moving away from the age-old process of cupellation to " part " bullion and moving toward the acid refining process developed by chemist ...

7. Troy weight - Wikipedia

   en.wikipedia.org/wiki/Troy_weight

   C-19 [17] Thus one troy ounce = 480 grains × 0.064 798 91 grams/grain = 31.103 476 80 grams. Since the ounce avoirdupois is defined as 437.5 grains, a troy ounce is exactly 480 ⁄ 437.5 = 192 ⁄ 175 or about 1.09714 ounces avoirdupois or about 9.7% more. The troy ounce for trading precious metals is considered to be sufficiently approximated ...