PRQSTAR PRODUCT LINE. Advanced precision cutting technology brings out the characterstic star effect in the round PRQSTAR Zirconia. The superb faceting enhances brilliance and maximizes light refraction. Absolute girdle consistency facilitates setting and production. PRQSTAR is available in a wide variety of colors and shapes that open up endless design possibilities. The durable and homogenous colors of each and every stone are achieved through the special TCF – Thermal Color Fusion coloration procedure. Thanks to this method the color of PRQSTAR stones remains stable even during the wax casting process.