Demantoid

demantoid . It got its name from the German word"deviant"- a diamond and the Greek"eidos"- similar, that is"like a diamond". It is believed that this crystal is one of the most expensive, attractive, and highly value the gems among the colored garnets. Stained with crystal demantoid green, emerald, yellow, pistachio, and brown shades, sometimes be...

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    Quartz (rock crystal)

    Quartz . The name of this crystal is derived from the German word"quarz", whose value is unclear. Pure, containing no impurities of quartz is transparent and colorless as a glass. Represents the silica - SiO2 with possible impurities, wh...