Coloured gem stones (such as amethyst, kunzite, topaz, morganite, aquamarine.) can darken or change colour over time when exposed to high levels of light. The sun’s harmful rays can affect a coloured gemstone’s durability and colour. Coloured gemstones are appreciated for their unique character, making them the ideal choice for jewellery. Coloured gemstones occur in a range of colours and are comprised of various materials that determine their structural integrity. Being so, coloured gems are ranked on the Mohs scale accordingly. Compared with diamonds, coloured gem stones are typically softer and more brittle and therefore should be protected from impact that can result in damage. It’s important to note that coloured gemstones should not be submerged in ultra-sonic cleaning machines as the vibrations may harm the stone. ADC pieces containing coloured stones may be cleaned in warm water and soap with a soft brush.
Below is the Mohs Scale of Hardness that indicates the hardness of gem-stones likely to be found in jewellery:
|7.5||Morganite, Emerald, Tourmaline, Zircon, Andalusite, Beryl|
|7||Iolite, Chrysoprase, Citrine, Jade, Onyx, Kunzite, Quartz, Blue Chalcedony, Amethyst, Ametrine, Garnet|
|6.5||Garnet, Jade, Tanzanite, Peridot|
|6||Moonstone, Sunstone, Labradorite|