Mexican Opals fine transparent variety of opal - Black opals are extremely vivid flashes of colour including red, with dark background and of highest value Milky opal or white opals are opaque with smaller and less spectacular softer markings and colours. Fire opals or Harlequin Opal is the finest quality and variety of gemstone Water Opal is clear and colourless with internal play of colour. Rose Opal or potch opal has a beautiful pink colour but opaque. Hydrophane Opal is opaque but appears colourless in water.
PEARL - Along with Coral, this extremely popular gemstone used in jewellery, is found in the seas not the land and is therefore not of the same composition nor characteristics of the earth born gemstones. Care must be taken to preserve the quality of pearls. Pearls are made of calcium carbonate formed within an oyster. The basic irritant is usually a grain of sand which stimulates the oyster to cover it with its own body secretion - eventually forming the well known round and perfect pearl. The lustre of the pearl comes from minute crackles on its surface - finer than those on opals. Their lustre increases in the body warmth of human beings and therefore the practice of allowing the shop attendants to wear the strings of pearl has a practical basis. Different pearl qualities depend upon colour and size and range from the tiniest "seed pearls" to the rare gems of considerable size Harvesting pearls from the wild is singularly unrewarding and cultured pearls have been able to meet the demand for these beautiful natural ornaments. Cultured pearls have been produced in China for several centuries as now in Japan, Australia and the Pacific.
RUBY - Next to diamond, rubies (and sapphires) are the most valued of the gems. Ruby is a variety of corundum, When the corundum includes chromium, it becomes ruby, when it contains titanium and iron instead and therefore is blue - the sapphire. The world's finest come from Myanmar, Pakistan and Afghanistan, also Burma, Thailand, India and Ceylon .Burmese ones are exceptionally beautiful - found near Mogo N.E. of Mandalay. "Pigeon Blood" rubies are the highest in the scale of value. Thai Rubies are often found with spinel and are darker red than the Burmese Rubies. A fine ruby is a magnificent gemstone. Ruby has been synthetically produced successfully since 1904. But the genuine rubies are valued because of their rarity and therefore have not dropped in commercial value, in fact have risen. Rubies are also used in Space research in connection with communication systems to cut out surface sounds of the earth and pick up beams from space.
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