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How to identify and choose sapphire

Sapphire with a variety of jewelry, can be described as brilliant. Summer to give people a sense of cool, winter wear people feel the spring in accordance with the side, which is the charm of sapphire. When you choose to have a savvy sapphire jewelry, you will feel comfortable and satisfied. So, how to choose sapphire? First, it is possible to correctly identify sapphires. Identification of sapphire steps with the same ruby, that is divided into two steps, the first step is to sapphire and other blue gems to distinguish; the second step is to sapphire natural stone and artificial identification of human products. And sapphire are confused with: blue spinel, kyanite, blue tourmaline, blue cone mine, Dong Qingshi, Tanzan stone and so on. And ruby, sapphire and other Cartier love ring replica blue gems the difference, mainly by the hardness test. Because the sapphire Mohs hardness of 9, second only to diamonds, other possible substitutes and counterfeit goods than it is low, for the finished product has been pondering, it can be used to characterize the standard hardness of jade, crystal and other hardness to determine the hardness, according to the hardness You can roughly sure whether it is sapphire.

In addition, according to the specific gravity, refractive index and other characteristics, can distinguish between easy and sapphire confused substitutes. The proportion of sapphire is 3.97-4.08 and the refractive index is 1.766-1.744. Blue spinel: hardness 8, the proportion of 3.6-3.8, single refractive index is generally 1.72. Blue spinel blue is gray with blue. No dichroism, as opposed to sapphire, which is a more reliable way. In addition, the blue spinel is blue with a red color; the artificial spinel is orange and the sapphire does not change color. Artificial spinel is sometimes posing as sapphire, due to contain cobalt elements, light exposure, the common red flash.

Blue tourmaline: hardness 7, the proportion of 3.05, the refractive index of 1.62-1.65, lower than the sapphire Generally no response under the color filter. But chrome tourmaline in the filter under the bright red appearance. Tourmaline blue is usually dark green and dark green indigo. Experienced people can be identified at a glance. Measured refractive index and absorption spectra are more reliable.

Tanzanite: hardness of 6.5-7, the proportion of 3.5, the refractive index of 1.69-1.70, produced in Tanzania. It is blue and transparent zoisite, the composition of calcium and aluminum silicate. The color of water containing 2% sodium 0.02% of the so. There is development of clever surface, not easy to cut. The naked eye can clearly see the three-color (visible dark blue, purple and light green color), so from all directions Tanzanite see have significant color changes, and sapphire only dichroism.

Dong Qing Shi: hardness 7, the proportion of 2.59, the refractive index of 1.54-1.55, the color was dark and gloomy, no bright and bright sapphire, three color is very strong. A direction for the lovely purple blue, the other direction for the light yellow. Compared with sapphire in all aspects of Cartier love bracelet replica very different.

Blue cone ore: hardness 5-5.6, specific gravity 3.67, refractive index 1.78. The refractive index is almost similar to sapphire. But the birefringence of 0.047 is much greater than sapphire. There is much greater than the sapphire dispersion, so the appearance looks dazzling.

Kyanite: hardness 4-6, specific gravity 3.69, refractive index of 1.72, the hardness of the various directions vary greatly. The kyanite column is easy to split and is not easy to be cut, and even if the cutting is successful, it is easy to form the appearance of the phosphor sheet. This is very easy to distinguish from sapphire.

Dong Qing Shi, blue cone ore and kyanite generally collectors are very favorite treasures, rarely for ornaments.

The sapphire and other blue gem differentiated, you can carry out the second step to identify the work, that is, sapphire natural goods and human selection identified.

Whether natural or man-made sapphire, its mineral composition is corundum, their physical and chemical properties are very similar. This is to be identified by careful observation of its morphological characteristics and production lines.

From the morphological point of view, unprocessed natural sapphires, often hexagonal barrel or columnar. While the man-made goods, the appearance of an inverted or like a short carrot-shaped, no clear edges and corners. Natural sapphire In nature, the crystal is called a very slow speed, which produces parallel to the hexagonal shape of the “hexagonal growth line”, also known as “hexagonal production ring.” If only part of this growth line, you can faintly find parallel lines. Where there is such a parallel hexagonal growth line or growth ring with sapphire, it must be natural. Artificial sapphires are produced in high-temperature furnaces, the crystallization time is very short, there is no time along the hexagonal crystal shape of the regular arrangement, but a layer by layer to add in the arc (the surface of the cylinder) gem on the surface, And gradually formed a curved “arc-shaped growth line.” Where there is such a circular arc growth ring or ring ribbons sapphire, it must be handicrafts.

It should be noted that the above identification method is equally applicable to the identification of natural rubies and artificial rubies.

In sapphire, how to choose a good sapphire it? This is mainly to pay attention to the color of sapphire.

To the level of color and color, sapphire blue can be divided into many kinds, the best one is with a soft luster of the cornflower (blue hibiscus) blue. This with a strong mystery of the blue gem, with a strong vitality of the ruby in stark contrast. This sapphire is only produced in Kashmir, it is also known as “Kashmir sapphire”. The finest sapphires, like rubies, have starlight effects, and six gems are emitted around the gem. In the United States of America Natural Museum collection of a piece called “Indian Star” 563 carat Cartier nail bracelet replica starlight sapphire. Sapphire color is too light is very good, the value is low, but the sapphire can not be too deep, blue too deep lack of angry and light, to lose its characteristics. Good quality sapphire to be uniform, no flaws and impurities. Pure sapphire should be like “emerald” like bagasse or “onion skin”.

In short, the color of sapphire should be moderate and depth to reconcile, sapphire also light and grinding flap points. The gem is a precious gem. Where to buy the darker, should be thinner, buy light, you should wear thicker.

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