Can any brown diamond be a candidate for HPHT?
No. Only diamonds of VS (very slight inclusions at 10X) clarity and higher can withstand the extreme heat and pressure of the HPHT process. Diamonds treated with irradiation and coating are not restricted to the same quality standards. Most clean brown diamonds are not suitable candidates and we reject more than 98% of all stones examined. While we can change the color of any clean diamond with heat and pressure, it is only a minute percentage that will yield optimal colors. HPHTdiamonds.com painstakingly and safely analyzes the chemistry of each diamond to determine the final color before processing so very, very few stones meet our exacting standards.
