(Conversion: 2.5cm = 25mm = approx. 1 inch) Personalise this necklace with your choice of Add On birthstone or charm. Gemstone necklaces are packaged in a lovely randomly chosen gift pouch with a description card, ready to give or keep for yourself! Kyanite – is one of the few minerals that does not require cleaning or clearing and is actually very useful for cleaning your other crystals. Does not accumulate or retain negative energy vibrations. Kyanite aligns all chakras automatically and immediately. Brings tranquility and calming effect on the whole being with particular focus on the throat and third-eye chakras. Please Note: You do not want to use water to clean your Kyanite as it could be damaging. We highly recommend you remove before excercising, swimming or taking a bath.