Explanation of Gem Refractometer Phenomena
Release time:
2023-03-16
When the gemstone to be tested rotates 360° on the refractometer, there is always only one shadow boundary (fixed), indicating that the gemstone is an isotropic gemstone (single refraction gemstone).
1. When the gemstone to be tested rotates 360° on the refractometer, there is always only one shadow boundary (fixed), indicating that the gemstone is an isotropic gemstone (single refraction gemstone).
2. When the gemstone to be tested rotates 360° on the refractometer, two shadow boundaries appear, one shadow boundary is fixed, and the other moves, indicating that the gemstone is a uniaxial crystal gemstone. If the dynamic value is large, it is a uniaxial crystal positive gemstone; if the dynamic value is small, it is a uniaxial crystal negative gemstone.
3. When the gemstone to be tested rotates 360° on the refractometer, both shadow boundaries move, indicating that the gemstone is a biaxial crystal gemstone. If the high value moves beyond the middle value, it means that the β value is close to α, and the biaxial crystal is positive; if the shadow boundary of the low value moves beyond the middle value, it means that the β value is close to γ, and the biaxial crystal is negative.
4. Point measurement method (hyperopia technique method): for gemstones with cabochons and smaller facets
1) Cleaning Prisms and Gems
2) Put a drop of contact oil on the metal table
3) Hold the gemstone, and use the arc surface or small facet to contact the contact oil on the metal table. The diameter of the oil droplet is preferably 0.2mm
4) Lightly place the gemstone with the oil drop in the center of the prism
5) The eyes are 25-45cm away from the eyepiece, move the head back and forth parallel to the eyepiece
6) Observe the half-bright and half-dark junction of the oil droplet, take a reading and record it, and keep the reading to two decimal places
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