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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]).
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 ...
As with all jewelry, there can be many variations of channel work. At times the walls will be raised—sometimes a center stone will be set between two bars that rise high from the base ring—or the channel may be cut directly into the surface, making the stones flush with the metal.
By 1500 BC, the peoples of the Indus Valley were creating gold earrings and necklaces, bead necklaces, and metallic bangles. Before 2100 BC, prior to the period when metals were widely used, the largest jewellery trade in the Indus Valley region was the bead trade. Beads in the Indus Valley were made using simple techniques.
Lapis lazuli (UK: / ËŒ l æ p ɪ s ˈ l æ z (j) ÊŠ l i, ˈ l æ Ê’ ÊŠ-,-ËŒ l i /; US: / ˈ l æ z (j) É™ l i, ˈ l æ Ê’ É™-,-ËŒ 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.
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.
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