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A top-quality aquamarine should be clear and free of inclusions. Today, the most popular stones are a clear blue, avoiding a tinge or either yellow, green or gray. In the 19th century, jewellery aficionados sought out sea-green gems. Because aquamarine's colour is usually pale, only larger specimens display any depth of pigment, but smaller stones are lively and decorative, especially when set with diamonds. Aquamarine are generally found in step cuts or as brilliants. Today, most aquamarine is heat-treated to produce the favoured clear, blue colour. This treatment reduces ferric iron content and thus removes any yellow tinge. The treatment is permanent, stable and acceptable in the market. However, because aquamarine is sensitive to heat, it should be protected from excessive sun and heat exposure. In addition to the mines of Minais Gerais, important sources of Cabochon aquamarine include Kunar Province, Afghanistan; Mianyang City, Sichuan, west central China; Embu, central Kenya, Zambezia, central Mozambique' Haramosh Mountains of Baltistan, northern Pakistan; crystal with other beryl and Buryatia Republic, eastern Siberia, Russia. Sites in the United crystals of morganite, States include Albany and Auburn, Maine. IOLITE Renowned for its p)eochroi the mineral cordierite has both aesthetic and industrial applications. Although it was only officially named in 1812 for P.L.A. Cordier (1777-1861), the French geologist who described it, it has been used and admired for centuries. Cordierite is a relatively common mineral found in aluminous rocks that have undergone medium- to high-grade contact or regional metamorphism. it is found in hornfelses, schists and gneisses in association with ANDALUSITE, SPINEL, QUARTZ, and biotite mica. It is also found in gneous rocks that have assimilated aluminous sediments. Iolite is the variety of cordierite that is used as a gemstone. Its name lerives from the Greek io, meaning 'violet flower'. Because it is common, it is an inexpensive gem, but its strong pleochroism makes it distinctive. Depending on the angle from which it is viewed, a stone can vary from bluish-purple to a wan grey yellow. Sometimes it is also known as 'water sapphire' because a clear stone can resemble a slightly violet SAPPHIRE. lolites were very popular in jewellery in Europe in the 18th century, but today they are used infrequently. Durable if slightly brittle, they are usually cut into stepped rectangles. When cutting, it is important to orient the stone for colour in order to enhance its colour display. Beads of iolite are also fashioned.