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The term ‘Tourmaline’ is the name given to a large group of boron silicate minerals. Tourmaline has a hardness rating of 7-7.5. This gemstone can be found in a wide variety of colours such as green, pink, blue, yellow, red, orange and colour-zoned/bi-coloured...
Different types of blue gemstones Search the internet for ‘blue gemstones’ and you will find a list of at least 33 stones ranging in alphabetical order from agate to zircon, but from these you might only recognise six or seven. In our June 2007 issue we featured 20...