Citrine is one of the most valued and popular gemstones in the quartz group. Some Biblical scholars believe that citrine was the tenth of 12 stones in Aaron's breastplate described in the book of Exodus. The stone was referred to as chrysolitus (Greek for "golden stone") in both Roman Catholic and Latin versions of the Old Testament, leading to some confusion over whether it was citrine, topaz, or beryl. However, in the King James Version, the tenth stone is referred to as beryl, meaning it would be heliodor, and modern scholars believe the stone was actually topaz.
Citrine is a hard, tough stone best cleaned by any standard jewelry cleaning method. Ultrasonic cleaners are usually safe for citrine.