Black Hills gold jewelry elsewhere. Pure 24 Karat gold bars, and stocks of pure silver and copper are the basic materials. These metals are not required to be mined in the Black Hills. Pure gold and other precious metal stock can be acquired from anywhere in the world. The finished jewelry known as Black Hills Gold must be "produced" in the Black Hills of South Dakota. The different colors of gold used for leaves and other details are made when the pure 24 Karat yellow gold is alloyed with copper to achieve the traditional 14 karat pink (or red) gold, and the gold is
Carat (mass) different locations. In terms of diamonds, a paragon is a flawless stone of at least 100 carats (20 g). The ANSI X.12 EDI standard abbreviation for the carat is CD. First attested in English in the mid-15th century, the word "carat" comes from Italian "carato", which comes from Arabic "qīrāṭ" قيراط, in turn borrowed from Greek "kerátion" κεράτιον 'carob seed', a diminutive of "keras" 'horn'. It was a unit of weight, though unlikely to have been used to measure gold in classical times. Carob seeds have been used throughout history to measure jewelry, because it was believed that there was