Sapphire appraisal
Sapphire appraisal
The natural sapphire's color is often non-uniform, the majority has the straight growth grain. The man-made sapphire color is consistent, its growth grain is the arc belt, is often obvious in vivo to have the crumbly bread shape or the beaded air bubble. cheap wedding dresses
The natural sapphire also has the obvious dichroism, looks from a direction for the blue color, from another direction looked, is the cyan color. Other gems assume the color to be different with the natural sapphire, according to the above may differentiate.
Moreover, the simplest method available degree of hardness measuring method, the natural sapphire may score the trace in the topaz, but other blue color gem scores the trace with difficulty in the topaz, therefore purchases time the jewelry, if the side does not have the instrument, so long as has together the topaz, sometimes can also solve some problems. [supplement explanation sapphire]
The sapphire English name is Sapphire, stems from Latin Spphins, the meaning is the blue color. The sapphire mineral name is a corundum, is the corundum race mineral. At present the gem the ruby outside, other assorted valuable stone step corundum is called as the sapphire. The sapphire chemical composition for the trioxide two aluminum (Al2O3), because of (Ti4+) or the iron (Fe2+) assumes the blue color including the trace element titanium. Is the trigonal system. Crystal shape Chang Chengtong the shape, short columnar, plate-type and so on, the geometric solid many are granular or compact massive. Transparently to translucent, glassy luster. Index of refraction 1.76-1.77, double refraction rate 0.008, dichroic. Heterogeneous body. Sometimes has the special optical effect - star light effect. Degree of hardness is 9, density 3.95-4.1 grams/cubic centimeters. Does not have the cleavage, cracks the principle growth. Under certain condition, may produce beautifully six shoots the star light, is called “the star light sapphire”cheap evening dresses .
The sapphire may divide into the blue color sapphire and the colorful color (non-blue color) the sapphire. The color produces “the cornflower take India to be blue” best as. It is said the sapphire can protect king and the crowned head is exempt from the injury, has “the king stone” the name. The international gem decides as the sapphire “nine months to be born the stone”, the symbolic affection, is loyal and is firm. The sapphire is world one of five big precious upscale gemstaylor made suits .
The sapphire appraisal with selects and purchases. The sapphire appraisal with selects and purchases the factor is the color, the weight, the transparency and only. The sapphire most major characteristic is the color is non-uniform, the polysynthetic twin does not grow, dichroic. The Burmese area produces the sapphire, assumes the bright blue color (titaniferous to send color), because contains the inclusion, may produce six shoots or 12 shoots the star light. The Indian Kashmir sapphire, assumes the cornflower blue color, is the microstrip purple indigo blue, the color is bright, is the high quality sapphire. Sri Lanka, Thailand, China, Australia produce the sapphire is also unique. The sapphire has brittleness, wears when should avoid beating, the clash.
In the nature, many with the grandmother green similar green transparent gem type, common has the jadeite, the alexandrite, the fluorspar, the olivine, the garnet and the zircon and so on, what the outward appearance resembles the grandmother green and easy to confuse is the alexandrite, the fluorspar and the jadeite. By the visual observation, the green jadeite assumes the translucent shape generally, often has interweaves the textile fiber porphyritic texture, but high quality grandmother green transparent crystal clear. Grandmother's green degree of hardness 7.5-8, but fluorspar degree of hardness is low, is only 4. The grandmother green proportion is small, but the fluorspar, the alexandrite, the jadeite proportion is big. The zircon chromatic dispersion strong and has the obvious double shadecheap women shoes .
In addition, but also has with the natural grandmother green similar artificial grandmother is green, the green glass and so on, between them place of the biggest difference is the natural grandmother green overwhelming majority has the slight defect or the inclusion, and obvious dichroism. Certainly, wants the strict correct discrimination to be best using the refractometer, the polariscope and so on appraises the instrument.
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