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  2. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Pearls are irradiated to produce gray blue or gray-to-black colors. [22] Methods of using a cobalt-60 gamma ray facility to darken white Akoya pearls were patented in the early-1960s. [ 29 ] But the gamma ray treatment does not alter the color of the pearl's nacre , therefore is not effective if the pearl has a thick or non-transparent nacre ...

  3. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Black gold is a type of gold used in jewelry. [13] [14] Black-colored gold can be produced by various methods: Patination by applying sulfur- and oxygen-containing compounds. Plasma-assisted chemical vapor deposition process involving amorphous carbon; Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt [3]).

  4. Blue in culture - Wikipedia

    en.wikipedia.org/wiki/Blue_in_culture

    Black replaced blue as the power colour in the 14th century, when European princes, and then merchants and bankers, wanted to show their seriousness, dignity and devoutness (see Black). Blue gradually returned to court fashion in the 17th century, as part of a palette of peacock-bright colours shown off in extremely elaborate costumes.

  5. The 7 Best Colors to Pair with Cobalt Blue, According to ...

    www.aol.com/lifestyle/7-best-colors-pair-cobalt...

    In contrast, designer Summer Thornton dials up cobalt’s glamour with dark shades of blue. “Combining it with rich woods and deep navy adds to its luxe appeal,” she says.

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments.

  7. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

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    914 Williams Ave, Columbus, OH · Directions · (614) 545-3190