Ametrine 18x28mm Oval - 15-16 Inch Faceted Bicone Terahertz is a spectacular man

Terahertz is a spectacular man made ore

including browns

famed mineralogist and jeweler George Frederick Kunz

Tiger Iron has long been popular with jewelry-makers

Kambaba Jasper is a sedimentary stone comprised of microcrystalline Quartz interlaced with Stromatolites — ancient fossilized colonies of primeval microorganisms

Ametrine 18x28mm Oval - 15-16 Inch Faceted Bicone Terahertz is a spectacular manAmetrine is quartz that occurs in bands of purple and yellow. As the name suggests, it is a combination of Amethyst and Citrine. The different colored zones in the stone result from different oxidation states of iron, due to exposure to different temperatures during its formation. It is believed that Ametrine was first introduced to Europe by a conquistadors gift from Bolivia to the Spanish Queen.