18 karat gold is 75% gold mixed with another metal such as silver, copper or zinc. Products made of 18k gold may be stamped with either "750" or "18k". 18k gold is about as pure as you can get and still be able to make masonic jewelry. As such, it will have the brightest shade of yellow relative to 10k or 14k.
Link to This Page Login to make this an affiliate link and earn revenue when purchased.