The specific gravity values rather less used in gem testing in most cases increase with increasing refractive index and fall within limits into defined groups and therefore may be readily found in the table. The following table lists these values for selected. Schubert 1 refractive index of various substances gemstones agate 1 544 1 553 alexandrite 1 746 1 755 almandine 1 75 1 83 amber 1 539 1 545. Refractive index or ri is one of the most important signatures of a gemstone. Refractive index ri is the slowing that is characteristic of since it travels through a given treasure species or substance.
The angle of refraction determines its refractive index or ri. Details include refractive indexes. Refractive index reading 1 544 1 553 1 560 0 016 1 600 0 010 1 536 1 579 1 532 1 542 1 530 1 540 1 530 1 544 1 530 0 005 1 553 0 039 1 518 1 530 1 518 1 585 1 514 1 539 1 513 1 600 1 544 0 031 1 553 0 047 1 540 0 027 1 553 0 047 1 540 0 037 0 010 1 490 1 609 1 518 0 028 1 530 0 011. Scroll down for a chart of over 100 gems and their corresponding ri. The undeniable fact that each gem features its own ri causes it to be necessary to facet each species at slightly various angles and makes it a characteristic that is useful gem identification.
Ri is the difference between the speed of light. Refraction is the bending of light as it passes through a gem. Refractive index 1 434 1 434 1 450 1 450 1 440 1 900 1 460 1 700 1 483 1 483 1 500 1 500 1 500 1 500 1 500 1 500 1 486 1 658 1 486 1 658 1 525 1 536 1 522 1 530 1 518 1 526 1 535 1 539 1 540 1 540 1 540 1 540 1 539 1 547 1 542 1 551 1 544 1 553 1 559 1 568 1 550 1 572 1 561 1 564 1 560 1 570 1 568 1 573 1 577 1 583 gemstone. Refractive index is the most important testing factor so the values given for these are published in ascending order. Gemstone refractive index double refraction.
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Measuring the refractive index is one of the first steps in identifying a gemstone though some gems have similar refractive indices and additional tests are required for a definitive identification. Measuring the refractive index is one of the first steps in identifying a gemstone though some gems have similar refractive indices and additional tests are required for a definitive identification. Ri is the difference between the speed of light. The angle of refraction determines its refractive index or ri. The specific gravity values rather less used in gem testing in most cases increase with increasing refractive index and fall within limits into defined groups and therefore may be readily found in the table.
