Turquoise, a valued stone for thousands of years, is often used in jewelry and decorative arts. The Zachary process can increase the hardness, color, and luster of the stone. RH & Company endorses the process, which involves adding certain chemicals to medium or higher grade stones and heating them. The result is a brighter, more […]

Turquoise has been used for thousands of years in jewelry and decorative arts. The Zachary process, a secret method, can increase the hardness, color, and luster of the stones used. RH & Company endorses the process, which involves adding chemicals to medium or higher grade stones and heating them. The result is a brighter, more […]