Amazonite, Andesine, Moonstone, Oregon Sunstone, Labradorite, Oligoclase, Orthoclase and Sanidine*are rare, and often quite valuable, gems from the feldspar family of minerals. Feldspar itself is extremely...
Investing in tourmaline is made much easier by the lack of lab imitations, although glass is sometimes sold to the unwary. Tourmaline investment probably suffers most from simply having too many choices....
Green emeralds are a variety of the gemstone beryl and have been highly prized since pre-historic times. Color - hue, tone and saturation Clarity - visibility of inclusions Cut -how well the stone is cut Carat...