Art Deco bracelet with double strand rhinestones and a inexperienced cabochon clasp, marked sterling, circa 1919. The second system is called CVD (or Chemical Vapor Deposition) and this is where superheated fuel is utilized to stimulate and increase a small ‘seed’ of diamond crystal right into a whole sized diamond. https://collinjrogy.tinyblogging.com/5-essential-elements-for-etsy-diamond-jewelry-71676402