9.16ct Octagon Cut Tourmaline 13x10mm Jewellers Gemstone Carat Gauge 3 V grooves: 5 x

3 V grooves: 5 x 2

Excellent heat insulation performance enables you to use the the soldering iron to directly solder in the mat

Want more accurate range display as 6000 counts

1 = Ø0 to Ø1

For detecting environmental electromagnetic radiation: indoors

9.16ct Octagon Cut Tourmaline 13x10mm Jewellers Gemstone Carat Gauge 3 V grooves: 5 xTourmalines are found in a wide range of colours, pink, green, blue, orange, yellow, brown, black, and colourless. Bi coloured Tourmalines are also common and stones which are coloured pink to green are known as watermelon tourmaline. Tourmalines can also display cat's eye chatoyancy, which is caused by parallel fibres running through the stone.; Tourmaline is found in many countries including Madagascar, Brazil, USA, Burma, Sri Lanka, Botswana and