Why Are Other Metals Mixed With Gold?

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You'll find examples of pure gold jewelry, but pure gold is soft and isn't practical for daily wear. Other metals are mixed with it to make it more durable (and to lower its cost).
Adding other metals to the mix also allows metallurgists to change the color of gold. Palladium or nickel can be added to create white gold. Adding copper produces a rose or pink tint, while silver gives gold a greenish cast.
When metals are added to the gold the result is an alloy, a blended mixture of the metals that you can think of as a very expensive cake batter. Solid gold is a term that can be used to describe an item that's at least 10K (in the US) gold all the way through. Even though it's a gold alloy--18K, 14K, or anything down to 10K--it can be called solid gold.
Properties of Gold :

Density of gold is 19.3 gm/cm3.
Melting temperature of gold is 1064.18 degrees C.
Troy ounce to gramme conversion :

1 Troy ounce gold is equivalent to 31.1034768 gms.

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