What Types of Fake Diamonds Are There? The high cost and inaccessibility of diamonds – cut diamonds of various degrees of ozvuchennoy – gave rise to the desire to create more or less successful imitations of precious jewelry. Century ago as materials for the production of fakes were made by natural minerals (and glass). One of the leaders of the modern stage racing for a brilliant Shine became a moissanite stone. Grown in the early 70-ies of the last century in the physics Institute of the USSR Academy of Sciences crystal Zirconia jewelry career began before the insertion of moissanite.
Visual properties of cubic Zirconia so bring it to the diamond, which at first sight to distinguish between a natural gem and cultured stone is not always possible. However, the jewelers know how to distinguish a diamond from cubic Zirconia. The thermal conductivity of cubic Zirconia in 200-500 times lower than the thermal conductivity of diamond! Measuring the amount of heat energy passing through the stone, most of the inexpensive electronic determinants of the genuineness of precious stones render a true verdict. A diamond In General, fake diamonds are many and varied. Handmade jewellery amazing when the wit and accuracy of copying, and when the uselessness of such attempts. Take a look at them in detail.
Moissanite is found in nature. …our planet very rarely and in trace amounts. There is therefore nothing surprising in the fact that Mineralogy of the past have left only a record of the findings and left no stone samples. Although kimberlite pipes separate crystals of moissanite theoretically can be traced. Meanwhile, the industrial synthesis of carbon-silicon material is conducted for several decades. Carborundum (this is the technical name of the compound SiC) is used as an abrasive.
Cubic Zirconia – a diamond for Patriotic people. His renowned jewelry properties, it became known recently. Only in the late 90-ies of the last century, the world was surprised to see: glittering faceted moissanite is stronger than diamond! However, to get rid of the dull “dusty” proseline in stone yet. And the price of artificial moissanite big. So the race for supremacy among the successful imitations of the diamond the stone with very small wins (often – temporary) ahead of long-time leader.
Do not find the natural diamonds in the Russian mines. But expensive, and the industry consumes a lot – and given b the will, and the entire production would have gone into the diamond abrasives. But the crystals of zirconium dioxide ZrO2, grown in the laboratories of FIAN, was a suitable material to simulate the diamond. With an almost imperceptible difference in the play of light in comparison with diamond, cubic Zirconia is available in the same colour, which is characteristic of natural diamond.
The advantages of the stone should be attributed to the high transparency and sufficient hardness. All the physical parameters of the cubic Zirconia is approaching the diamond, but at the price of a diamond separated from incredibly far away. What motivates crooks to give artificial crystal natural gem. Podavlyaet confusion and the reluctance of Western gemologists call the stone’s original and recognizable name. In the course of a few dissimilar kinds of artificial mineral.
Most manufacturers of cubic Zirconia on the labels prints the abbreviation “CZ”, which stands for “cubic Zirconia”. That also sounds weird, but better than mimetic QI Diamonds. Imitation diamond. Grenades explode sparkle like diamonds. In nature, garnet is a complex oxide of silicon, always painted. In the artificial production of grenades made including colorless, allowing the fraudster to pass them off as diamonds. Half a century ago physics was in need of materials for the construction of lasers.
The crystals of yttrium-aluminum garnets have proved to be suitable for the imitation of brilliants. However, the indicators of visual appeal YAG not too close to the diamond. The refractive index of a crystal of carbon is many times above the same coefficient of yttrium-aluminum garnet. However, the AHI is perfectly polished, and the Shine of its facets, blinding is not worse than the gloss of the facets of a diamond. The first attempt to simulate a large diamond was taken in 1969 year and has been successful.
Semidesyatiletiyu diamond and its copy, turned from the NCI, seemed similar as two drops of water. Until it was close… Spreader beams of colored light diamond (pear cut) differed considerably from the cold shiny faux garnet of the same shape. The price of AHI is about 20 times lower than the price of a natural diamond, so the demand for the stone (mainly in English-speaking countries). Disadvantages of YAG deprived gadolinium-gallium garnet. Possessing the same capacity to Shine, like a diamond,
GGG is approaching the diamond on the indexes of refractions of light. Industry artificial jewellery clapped his hands, learning about the strange properties of the crystal – but prematurely. GGG turned out to be easily electrified and actively collects dust. Its hardness is insufficient for the manufacture of jewelry. Excessive fragility entails the danger of damaging the edges even with careful wear jewelry. Moreover! Under the action of sunlight gadolinium-gallium garnet is dirty-brown, brown.
While the cost of the crystal is high and its production is not particularly profitable. So today, jewelry from GGG releases (if not stopped) only one firm in the world. Strontium titanate: the play of light is stronger than diamond! Established in 1953, the year as a possible substitute for crystalline carbon gem quality, strontium titanate SrTiO3 admired of its kind and scientists, and experts. His sparkle of faceted crystals in all respects superior to the best diamonds, and in a series of artificial decoration did not go, and flew.
Unfortunately, it soon became clear that the hardness is low (just above 5 points on the Mohs scale) makes the short-lived stone. Besides, titanium-strontium oxide brittle that even mild compression, does not blow, is able to split the jewelry box. Desperate attempt jewellers looked attempts to glue a substrate of fragile, but beautiful strontium titanate with a ‘cap’ of artificial sapphire or of spinel. Decades of experiments have not led to the miracle: all adhesives reduced the decorativeness of the product.
According to unconfirmed rumors, the modern Japanese masters have learned to apply a strong “head” on titanate basis – however, the market of such products is not visible. Apparently, the profitability of this production is somewhat low… Unprofitable and production of jewelry, more or less faithfully mimic the diamond, other titanates of barium and calcium. The cost of these crystals is that decorating with them fit to sell expensive diamond sets. An important optical feature, inherent in all of the titanate, negates their decorative qualities.
Glare and flare, produced crystalline titanates, very “Xinyu”. This light looks impressive, but… the color palette of diamond light immeasurably richer. Rutile is a veteran among synthetic imitators of the diamond. Rutile titanium dioxide TiO2 in nature is common, mostly in the form of needle crystals and their intergrowths, reminiscent of exotic flowers or sea urchins. Chemists of the postwar period had managed to grow rutile crystals, suitable for jewelry cutting.
Faceted rutile showed the play of light is unattainable for either natural diamond or other artificial stones. However, the high parameters refractions of light did not give the “run” bottom faces jewelry – and it was emasculated the light pattern… In addition, colorless rutile no (unknown why). At best it is straw-yellow! And although the technology is different countries from time to time publish success reports about how to obtain colorless rutile, it is either unsuitable for jewelry processing needle-like crystals, or thin films on the quartz base.
By the way, even the best samples of jewelry of rutile grown in the form of a thin columnar formations. Therefore, rutile imitate diamond, as a rule, small. And due to the low strength and low hardness of the stone is still rare. Choosing among imitations. Talking about synthetic imitations of diamond, we have only touched some of the most successful materials. But the craft of fake diamonds there are, thriving, thousands of years, and varieties of products of this kind, there are big set. Sapphires and spinel, quartz and Topaz, as well as a glass of a specific composition and a variety of transparent materials from time to time to try on the role of a diamond – mostly unsuccessfully…