gems, corundum, synthetic corundum.7, flux ruby, Knischka ruby

Discusses the growth and features of Paul Knischka’s flux-grown synthetic ruby. Corundum was crystallized synthetically by an as yet undisclosed method of gradient-technique, through super-cooling and super-saturation. The finished crystals have flat, brilliant growth-faces and mineralogically significant indices, whose great number as well as combination has heretofore been unobserved. The elementary nuclei can be grown to macroscopic single crystals, twins or multiple-complexes, phantoms, as well as clusters. The trade mark (K was formed using the initials of Paul Knischka's name with the P" inverted. These synthetic rubies are, once cut, distinguishable from natural ruby in the same manner as natural ruby is distinguished from synthetics of other makes and methods."