Mar 9, 2016 Gemstone Mining Methods by Sheweta Dhanuka Gemstones are treasured by most of us and to In this method powerful jets of water is used to loosen the gem material from the overburden. . Hard Rock Tanzanite Mining.
Jul 2, 2017 However, a pearl is not classified as a mineral since it is not What is defined as a gemstone is a more generic term used largely by .. There are three birthstones for the month of December: tanzanite, zircon and turquoise.