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  2. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Purple gold Goldaluminium phase diagram. Purple gold (also called amethyst gold and violet gold) is an alloy of gold and aluminium rich in gold–aluminium intermetallic (AuAl 2). Gold content in AuAl 2 is around 79% and can therefore be referred to as 18 karat gold.

  3. On Cheong Jewellery - Wikipedia

    en.wikipedia.org/wiki/On_Cheong_Jewellery

    Singapore. Key people. Ho Nai Chuen, MD. Number of employees. 1300. Website. www.oncheong.com. On Cheong Jewellery (安昌) is a jewellery manufacturing company based in Singapore. On Cheong Jewellery is a member of the Singapore Jewellers Association (SJA), a non-profit representing jewellery operators in Singapore.

  4. Jade - Wikipedia

    en.wikipedia.org/wiki/Jade

    Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments. Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]

  5. Aiguillette - Wikipedia

    en.wikipedia.org/wiki/Aiguillette

    Aiguillette. Commissioned officers (front row) and non-commissioned officers (second row) of the Household Cavalry in full dress wearing aiguillettes. Bundle of 20 braided gold and silver laces with stamped brass tags or aiglets, first half of the 17th century. An aiguillette ( French: [ɛɡɥijɛt] ⓘ, from aiguille, "needle"), also spelled ...

  6. Gold–aluminium intermetallic - Wikipedia

    en.wikipedia.org/wiki/Gold–aluminium_intermetallic

    (1) Gold wire (2) Purple plague (3) Copper substrate (4) Gap eroded by wire-bond (5) Aluminium contact Gold–aluminium phase diagram. Gold–aluminium intermetallic is a type of intermetallic compound of gold and aluminium that usually forms at contacts between the two metals. Gold–aluminium intermetallic have different properties from the ...

  7. National Treasures of Singapore - Wikipedia

    en.wikipedia.org/.../National_Treasures_of_Singapore

    Below is a list of artifacts considered to be National Treasures by the National Museum of Singapore. [1] The Singapore Stone is a fragment of a large sandstone slab which originally stood at the mouth of the Singapore River, believed to date back to at least the 13th century and possibly as earlier. Munshi Abdullah is widely considered as the ...