Cutting a 20ct Topaz Crystal!!! 💎 This was one of the best days for a Gemmologist 😍 The topaz has a rough worn outside because it’s from an alluvial mine. This means this gemstone has travelled and been found in a river bed. A topaz dug up from the ground would have a much more defined crystal shape and shinier surfaces. Ken @khrrngtn5 is one of the leading lapidarists in the UK. He is an excellent teacher and has invited us to learn gem cutting. He uses traditional methods and the machine is