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.
Citrine :
The Citrine is a gem variety of quartz. Natural citrines are rare; most commercial citrines are heat-treated amethysts.
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