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As gemstone wholesalers we at www.gemrockauctions.com offer a wide range of Gemstones, loose gemstones and other high quality products Including Chalcedony, Chalcedony is a cryptocrystalline form of silica and generally has a waxy lustre, and may be semitransparent or translucent. Its colour is usually white to grey, greyish-blue or a shade of brown ranging from pale to nearly black. It is a highly sought-after precious Gem, which for centuries has been widely used in the creation and encrustation of jewellery and everyday items. - Its Chemical Composition number is Si02 - - The owners of www.gemrockauctions.com have their own factory and source their rocks and gemstones directly from miners or as close as possible in order to receive the right price, our factory can offer high discounts on sales we have 16 staff who cut gemstones full time and produce high quality products - we don’t cut artificial gemstones.