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The basis of the diamond is pure carbon atoms that exist deep underground, subjected to intense heat and pressured over billions of years. Price. Diamonds - piece goods. A quality diamond that weight 1 gram can worth thousands dollars. With what can be confused a diamond? The biggest similarity with diamonds has a cubic zirconia (colorless zircon, created through laboratory synthesis). Although they are very similar externally, but if you look closely, colored cubic zirconia gives less glare than diamond. Diamond also is replaced by beryl, sapphire, topaz, quartz. Tips on choosing. Try to understand the mineral. The value of any precious stone depends on four factors: weight, shape, color and quality. Weight is measured in carats (in ancient times, the word carat was referred to the special seeds with which was compared the value of stone). 1 carat equals 0.2 grams. The price per carat increases with the diamond mass. Particularly sharp rise in price is marked at the turn of 1 carat, when the price of gemstones with equal characteristics, weighing 0.99 carat and 1 carat is different in about 1.3 times, because it is believed that a "real" diamond begins with a mass of 1 carat, diamond rings. Depending on weight, diamonds are divided into: small (up to 0.29 carats), medium (from 0.30 to 0.99 carats) and large (more than 1 ct.) If a diamond is too small, its mass is measured in "points" equal with 0.01 carats, or about 2 mg. Form. Type of cut: round, oval, etc. Type of cut will determine how will "play" and will lit a gemstone. The round shape (K) is the most common variant. In form of ovals and hearts, diamonds are cut less frequently, and they cost less. The cut can be simple = 17 faces (K-17) (for small stones) and complex = 57 faces (K-57). The latter ratio (K-57) can most clearly express the beauty of the stone. Another point that affects the assessment of stone, is the quality of cut (symmetry, polish, etc.), it is estimated by letters "A", "B", "C", "D", where the first letter represents the highest class. Color. Due to diamond formation nature, only single specimens are truly colorless stones. Than colorless is a "white" diamond, the higher is its value. On fancy natural colored diamonds these rules don't apply. These diamonds have a bright color - blue, pink, red, yellow, green. They are very rare and worth several times more the value of "white" diamonds. Diamonds are classified into color groups from colorless, with a gradual increase in saturation of yellow, brown and gray shades, buy diamond jewelry. The number of color groups depends on stone weight. Small diamonds Cr-17 are classified according four-color groups (first - colorless stones). Small diamonds Cr-57 are classified in 7 color groups (first - colorless stones). Medium and large diamonds are classified by nine major color groups (1 - colorless stones). Diamond cleanliness (quality). Diamonds are classified into groups according to the purity internal features presented in stones (inclusions, cracks, surface defects, the removal of which would lead to significant loss of weight), their number, place and color (are considered gem characteristics, visible with a magnifying glass 10-fold increase). While these shortcomings make a diamond unique, their presence reduces the item cost. The number of groups depends on weight. Thus, small diamonds Cr-17 are classified by six groups of purity, small diamonds Cr-57 in 9 groups. For medium and large stones there are 12 groups of purity. The ratio of color and clarity is usually expressed in fraction, and the more is the numerator and denominator, than the lower is the quality of diamond stone. For example, a diamond with 3/3 characteristic is considered good, but the fraction 9/12 indicates a very poor quality of the stone.
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