|Factors For Buying GemsBefore buying an astrological gem, one should consider a lot of things. If you are not well informed about how to choose the gems, there are chances that you’ll land up buying a fake gem for yourself. It will cost you a lot of money and on top of that, the Gem will not work the way it is supposed to work. So just be very careful before buying gems. It is advisable to gather information about the weight, luster and appearance of the Gem, because these are the factors influencing the purity of the stone. Here are a few tips on the nature of gems, which might come to your use before you go for your purchase.
Emerald, a Gem of Beryl family, is a silicate of beryllium and aluminum 3BeO.Al2O3.6SiO2. The colour of Emerald is mainly due to traces of chromium replacing aluminum ions in the hexagonal beryl crystal. In India, Emeralds are found in Rajasthan, Orissa and Madhya Pradesh.
Emeralds are best identified through their inclusions. These inclusions can be seen by naked eye or else under magnification. If, however, an emerald lacks inclusions, then the gem is fake. The inclusions in Emeralds include flakes of mica, fibre, milky white spots, straw and bamboo and small cubes of rock salt, Black spots are also seen in Emeralds. These inclusions are there because of their crystalline property. The synthetic Emeralds contain ‘nail’ like inclusions, ‘brush-marks’ or chains of bubbles.
Sapphires are crystallized alumina (Al2O3) and in are colourless under pure conditions. Sapphires are found in various colours as pink, blue, green, yellow, orange and white. In India, Yellow Sapphire is known as Pukhraj and Blue Sapphire is known as Neelam. In India, Sapphires are found in Jammu. These are considered to be the best in the world. Few sapphires are also found in Orissa but they are not of very high quality.
Natural Sapphires carry within them clear signs of external, which helps its identification. It should also consist of inclusions, which should be visible to the naked eye or under magnification. Without inclusions, the gem is fake. The inclusions are generally feather like. Liquid inclusions are also often seen. Synthetic Sapphires are very clear and under magnification show bubble like inclusions. Fake sapphires shine abnormally under light.
Ruby, which is corundum, is crystallized alumina (Al2O3) and in pure form it is devoid of colour. The name Ruby comes from Latin ‘Rubrum’, which means ‘Red’. The rich colour in Ruby is mainly due to small amounts of chronic oxide present in the crystals.
Natural Rubies must have inclusions within them. The inclusions are like ‘silk’ enclosing small crystals of other minerals in the form of pale angular grains, cavities of irregular shapes, which give a silky effect by reflected light. Without inclusions Rubies often are just pieces of glass.
A synthetic Ruby will either not have any inclusions or else the inclusions will be bubble like or cracks, as seen in a glass. The cracks will give a milky colour and will be of an even nature.
Gomedh is a Gem of garnet family. The most special phenomenon about Gomedh is that magnets attract them. Chemically it is known as Grossular (3CaO.Al2O3.3SiO2).
It is found in number of colours like green and pink but generally it is orange brown.
It is available in abundance.In India it is found in Andhra Pradesh, Orissa, Rajasthan and Bihar. Gaya mines in Bihar are the biggest source of this gem. Recently, very good quality of this Gem has been found in Orissa.
This Gem contains inclusions, of scattered materials or flat bubbles. The colour of the gem is transparent brown, giving the insides of the gem a liquid feel. The inside, when viewed under magnification looks like a thick sticky liquid and certain areas look out of shape with lesser transparency. The lighter the Gomedh or Hessonite, the better the quality of the gem.
Diamond is carbon in its pure form. Chemically there is no difference between diamond, coal and graphite. But it becomes a special gem because of its glitter, which is due to a special chemical bonding. It is said to be the hardest substance found on earth.
In India Diamonds are found in Madhya Pradesh, Orrisa and Andhra Pradesh.
Real Diamonds must possess some inclusions, which are visible by naked eye or under magnification. Diamonds, which do not have any inclusions under 50x magnification, are very rare.
The small black spots visible in Diamonds are crystals of Graphite or other forms of ‘Carbon’. These black spots shine under light. Diamonds have an affinity for grease, the surface of a cut Diamond will generally have a film of grease if it had been handled. The most unique feature of a diamond is that they reflect light totally. White light entering a diamond is dispersed into a spectrum of colours, giving flasks of different colours from the smaller crown facets.
Coral, an opaque stone. is formed from the calcareous skeletons of tiny sea animals which live in vast colonies in warm waters at a moderate depth. It is composed chiefly of calcium carbonate. This is arranged as fibers radiating from the central axis of the curving coral branches.
Corals exist in many forms but only high quality Red, Pink, Blue, Black and white corals are used as jewellery. In India corals are found at number of places around the coast. The Andaman and Nicobar Islands and the Lakshadweep are coral islands and corals are found all around them.
Coral, being an opaque gem it is very difficult to identify. Natural corals if seen under magnification always have black marks, which are actually holes. A very careful examination is required to identify a natural coral. Real corals are not very clear and if clear they are very costly. Manmade corals are very commonly found in the market places being sold as real corals.
Cat’s Eye is chemically known as Chrysoberyl (BeO.Al2O3). It is generally found in greenish, brownish, yellowish and colourless shades and is a brittle stone.
It is a hard material, which is often worn as a ring stone.
In India, it has been found in a very big way in Orissa. It is also found in Kerela, Andhra Pradesh, Karnataka, Tamilnadu and Bihar.
The Gem is opaque. Often fake cat’s eye is too clear. The natural gem shows small marks, grains of stone and small irregularities below the polished surface. The lower part of a Cat’s Eye is not polished but is only grained, hence the stone is rough at this part.
One very important factor, is that some deformities are always present in a Gem – their absence should be a cause of concern and not their presence.
Pearl is formed pearl oyster. Pearl is formed due to the drying up of a certain secretion from the Oyster’s body. Pearl contains nearly 92 per cent of calcium carbonate (CaCO3) held together by conchiolin 6% and has 2% water. It is an opaque gem. In India, they are found in South Tamil Nadu, Andhra Pradesh and in some lakes of Rajasthan.
Natural pearls are significantly lustrous and look precious. When viewed under magnification it contains discontinuous wavy lines. If dropped on a hard surface they bounce back. Fake pearls lack this shine and colour that a real pearl possesses. Pearls are more often fake than real. So one should be aware of the nature of the real pearl before buying them.