Gold :
Because of the softness of pure gold, it is alloyed with silver, copper or palladium. The proportion of these other metals give yellow, white gold.
Without precision, the gold used in jewelry is 18 K, corresponding to 75% pure gold.
Treated :
Treated refers to a heating of a gemstone in order to homogenize and reinforce its color, but also to reduce inclusions. A non treated stone means a stone which has not been heated.
Diamond :
In mineralogy, diamond is an extremely rare, precious and hard (named after the ancient Greek "unbreakable") metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.
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