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  2. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [5] Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [4] Copper ...

  3. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    Untreated tanzanite is a trichroic gemstone, meaning that light that enters this anisotropic crystal gets refracted on different paths, with different colour absorption on each of the three optical axes. As a result of this phenomenon, a multitude of colors have been observed in various specimens: shades of purple, violet, indigo, blue, cyan ...

  4. List of jewellery types - Wikipedia

    en.wikipedia.org/wiki/List_of_jewellery_types

    This page was last edited on 6 February 2025, at 11:20 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  5. Electrum - Wikipedia

    en.wikipedia.org/wiki/Electrum

    Electrum was often referred to as "white gold" in ancient times but could be more accurately described as pale gold because it is usually pale yellow or yellowish-white in color. The modern use of the term white gold usually refers to gold alloyed with any one or a combination of nickel, silver, platinum and palladium to produce a silver ...

  6. Necklace - Wikipedia

    en.wikipedia.org/wiki/Necklace

    In Ancient Babylon, necklaces were made of carnelian, lapis lazuli, agate, and gold, which was also made into gold chains. [6] Ancient Sumerians created necklaces and beads from gold, silver, lapis lazuli and carnelian. [6] In Ancient Egypt, a number of different necklace types were worn.

  7. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Spanish emerald and gold pendant at Victoria and Albert Museum Enamelled gold, amethyst, and pearl pendant, about 1880, Pasquale Novissimo (1844–1914), V&A Museum number M.36-1928. Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early ...