Karat is a term used to demonstrate gold virtue. Unadulterated gold is 24 karat. The legitimate standard is to stamp gold gems with markings like 10KT, 14KT and 18KT. The Karat stamp demonstrates the immaculateness of the metal. The number going before the KT stamping demonstrates the number of parts out of 24 are unadulterated gold. The composites blended in with gold are added to control sturdiness, variety and the expense of fine gems.