![]() This has two effects on the gem: It alters the colour to colourless, blue or golden (the most preferred colours for zircon) and orange to red colours. Zircon ( 7.5) medium to dark translucent blue The most prized colour is a deep-blue aqua. Aquamarine (7.5 – 8.0 ) light translucent blueĪquamarine is a member of the beryl family (which includes emerald) and ranges in colour from an almost colourless pale blue to blue-green. London Blue is dark blue with a moderate to dark tone and saturation. Swiss Blue is bright blue with a light tone and light to moderate saturation. Topaz (8.0) translucent, from very light to medium blue Here are some of the most common gemstones: Sapphire (9.0) the richest, saturated blueīlue is by far the most popular colour for sapphires, but they can be almost any colour, including yellow, green, white, colourless, pink, orange, brown and purple. There are ten minerals in Mohs scale, from the ‘softest (1)talc, (2)gypsum, (3)calcite, (4)fluorite, (5)apatite, (6)feldspar, (7)quartz, (8)topaz, (9)corundum, to the hardest, (10)diamond. The globally recognised system of measuring gemstone hardness is known as the Mohs’ scale (named after Friedrich Mohs, a mineralogist who invented a scale of hardness based on the ability of one mineral to scratch another. In this article we will feature the most commonly recognised of these stones in order of the ‘hardness’ (or wearability) – in other words those most suitable for jewellery. In our June 2007 issue we featured 20 gems which had blue as the dominant colour. ![]() 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.
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