The imperial topaz is also known as ‘precious topaz’, as it is the most sought-after and rarest natural topaz. It represents less than 0.5% percent of facet-grade topaz found in...
Amazing Pedra Azul´s aquamarine in the Washington’s Smithsonian museum!This is an article I found today in the www.theworld.org: “Here’s a gem of a Geo Quiz: We're looking for the name of a...