A grayish-white, hard, brittle, non-corrosive metallic element in the Group VIB of the Periodic System, obtained from chromite. One of the eight metallic elements, mainly responsible for green or red color in very important gem minerals such as emerald, r
A method of growing synthetic crystal by high-melting point devised by Czochralski and is named as Czochralski pulling technique. Where a seed crystal is gently lowered until it is in contrast with pure melt in the crucible and it is then pulled slowly up
An unusual feature occur in Verneuil synthetic corundum by plunging of still heated stone into a much cooler liquid (thermal shock), which create fractures and it resemble closely to natural stone. By pursuing of this process developed honeycomb pattern d
A misleading term for synthetic spinel or corundum (sapphire), which is able to change color like alexandrite reddish-green in daylight and reddish at artificially light, such stones were at first misnomered as scientific alexandrite. Synthetic sapphire
Inclusions, which are produce by hydrothermal synthetic emeralds by presence of wispy or veillike groups, manufactured by Chatham, Gilson, and Zerfass. That is an unmistakable characteristic of flux-fusion or flux-melt method.
Prized by collectors. Synthetic strontium titanate or fabulite found in a similar manner to perovskite. Natural counterpart of fabulite with the same composition is called tausonite.
Synthetic alexandrite made in three methods in Russia, (a) growing synthetic stones of solution-growth process or flux process specially for alexandrite, (b) Growing stone of floating-zone process. (c) Melt-grown process or so-called pulling method.