If you are looking for a special sapphire, we recommend this product. It is a natural, green sapphire with a round shape and a size of 4.80 mm. Its weight is 0.42 carats and its clarity is good: it has no inclusions visible to the naked eye. This sapphire has been heat-treated to improve its colour and brilliance. It comes from Madagascar, a renowned source of quality gemstones. Note that its shape is slightly asymmetrical, not a perfect round shape. This sapphire is ideal for mounting in elegant and refined jewellery.
Under the name sapphire are known all corundum gemstones with the only exception of the ruby red variant which is called ruby. However, the name sapphire is very common for blue gemstones, but this blue should not be understood as the colour of clear sky, but all shades of blue up to very dark blue and even black. Sapphire is found in a wide range of colours and shades. Sapphire is a mineral that occurs as Al2O3 single crystals. The colour is determined by impurities such as Fe2+, Fe3+, Cr3+, Ti4+ or V4+. It has a hardness of 9 on the Mohs scale, after diamond. The rocks where sapphires have been found are called pegmatites, which through erosion processes have been transported and deposited in alluvium in river beds. The most important sapphire-producing countries are Sri Lanka (formerly Ceylon), India, more recently the USA, Australia and Nigeria.