Black gold (jewellery)

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Note that "black gold" is also a slang term for crude oil.

Black gold is a type of gold used in jewelry. It is produced by various methods, such as electrodeposition using black rhodium or ruthenium; plasma assisted chemical vapour deposition process involving amorphous carbon; and controlled oxidation of carat gold containing chromium or cobalt. Electroplating solutions that contain ruthenium give a slightly harder black coating than those that contain rhodium.

Unfortunately, black gold is very hard and making jewellery out if it usually necessitates using previously-made melting forms. Changing the size, adding stones or other customizations are often too hard for the common goldsmith.

--169.157.38.137 15:52, 3 April 2007 (UTC)nooooooo way!!!!!!!!!!!== External links ==

• A reference to how other colored gold are made.
  
• A picture of a gold ring with black gold