gem stone Alexandrite gemstone By Rita R. McKenna Post a comment Alexandrite is named after the Russian tsar Alexander II (1818-1881) , the very first crystals having been discovered …
gem stone Benitoite Gemstone By Rita R. McKenna Post a comment Benitoite is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite . Benitoite …
gem stone Diamond collection brings deep Earth to the surface. By Rita R. McKenna Post a comment Diamond collection brings deep Earth to the surface Analysis of diamonds provides a look inside Earth's mantle Summ…
gem stone Chrysoberyl By Rita R. McKenna Post a comment The name chrysoberyl comes from the Greek words chrysos, meaning golden, and beryllos, which refers to its beryllium co…
gem stone Almandine By Rita R. McKenna Post a comment Almandine, also known incorrectly as almandite, is a species of mineral belonging to the garnet group. The name is a…
gem stone Amazonite By Rita R. McKenna Post a comment Amazonite (sometimes called " Amazon stone ") is a green variety of microcline feldspar . The name is taken f…
gem stone Amber Gemstone By Rita R. McKenna Post a comment Amber is fossilised tree resin (not sap), which has been appreciated for its colour and natural beauty since Neolithic…
gem stone Amethyst Gemstone By Rita R. McKenna Post a comment Amethyst is a violet variety of quartz often used in jewellery. The name comes from the ancient Greek ἀ a- ("not&…