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  2. List of most expensive philatelic items - Wikipedia

    en.wikipedia.org/wiki/List_of_most_expensive...

    This is a list of the highest known prices paid for philatelic items, including stamps and covers. The current record price for a single stamp is US$9,480,000 paid for the British Guiana 1c magenta. [1] [2] This list is ordered by consumer price index inflation-adjusted value (in bold) in millions of United States dollars in 2023.

  3. Silver hallmarks - Wikipedia

    en.wikipedia.org/wiki/Silver_hallmarks

    "The words "silver" and "sterling silver" describe a product that contains 92.5% pure silver. Silver products sometimes may be marked 925, which means that 925 parts per thousand are pure silver. Some jewellery described as "silver plate" has a layer of silver applied to a base metal. "Coin silver" is used for compounds that contain 90% pure ...

  4. Sterling silver - Wikipedia

    en.wikipedia.org/wiki/Sterling_silver

    It bears the royal stamp ENRI. REX ("King Henry") but this was added later, in the reign of Henry III . 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 ...

  5. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    Jewellery (or jewelry in ... (90% pure) to 950 (95% pure). The silver used in jewellery is usually sterling silver, ... such as using a stamp or engraving, were then ...

  6. Fineness - Wikipedia

    en.wikipedia.org/wiki/Fineness

    Millesimal fineness is a system of denoting the purity of platinum, gold and silver alloys by parts per thousand of pure metal by mass in the alloy. For example, an alloy containing 75% gold is denoted as "750".

  7. 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.

  8. Silver standards - Wikipedia

    en.wikipedia.org/wiki/Silver_standards

    Silver standards refer to the standards of millesimal fineness for the silver alloy used in the manufacture or crafting of silver objects. This list is organized from highest to lowest millesimal fineness, or purity of the silver.

  9. Black Hills gold jewelry - Wikipedia

    en.wikipedia.org/wiki/Black_Hills_gold_jewelry

    The finished jewelry known as Black Hills Gold must be produced in the Black Hills of South Dakota. The different colors of gold used for leaves and other details are made when the pure 24 Karat yellow gold is alloyed with copper to achieve the traditional 14 karat pink (or red) gold, and the gold is combined with silver to create the 14 karat ...

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