Gold - 13

Rose Gold
Gold is known in different forms.
Pink gold or red gold is one among them. It is also called rose
gold. It was very famous in Russia in the nineteenth century and so
it is also called a Russian gold. Rose gold is an alloy of gold and
copper. It is mostly used for specialized jewelry because of its
reddish color. The higher the copper content, the higher the red
coloration. This gold is also used as a finish in bell interiors of
musical instruments. It consists of a very thin plating of copper
over a layer of silver and no actual gold is used.
Different carat alloys
22 karat rose gold is also known as crown gold. 18 karat rose gold
may be made of 25% copper and 75% gold. 14 karat red gold is often
found in the Middle East and contains 41.67% copper.
Black gold or 'grey gold' is another
form of gold which is used in jewelry. Gold is known for its warm
yellow color but it can be produced by various methods in differing
colors ranging from white to black . Black colored gold can be
produced by various methods as follows
- Electrodeposition or
Electroplating using black rhodium or ruthenium. Solutions that
contain ruthenium give a slightly harder black coating than
those that contain rhodium.
- Patination by applying sulfur
and oxygen containing compounds.
- Plasma assisted chemical vapor
deposition process involving amorphous carbon, and controlled
oxidation of carat gold containing chromium or cobalt.
More recently a laser technique has
been developed that renders the surface of metals deep black.
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