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Collet block with perfect narrow oval holes
Utilises ultrasound to measure the thickness of gold/silver bars and coins
Item Height: 0
Size: : approx
it will humidification or dehumidification automatically
10.17ct Octagon Cut Tourmaline 18x9mm gemstones Collet block with perfect narrowTourmalines 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
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