The quality of the gem itself is the key to determining the price of jewelry. 一般的に言えば, the quality of gemstones depends on the color, 透明性, 明確さ, cut and weight of gemstones.
Color is the most important factor in determining the price of colored gemstones. For different kinds of gems, the most expensive colors are not the same. But no matter what kind of color, it is required to achieve the most ideal color hue, lightness and saturation. 例えば, the top ruby should be pigeon blood red, bright and the saturation should be 70%~85%. If there is a slight deviation, the price will be Huge difference.
Under normal circumstances, もちろん, the more transparent a gemstone is, より良い, but for gems with special optical effects such as cat’s eye, starlight, 等, complete transparency will make the optical effect blurred and unclear. したがって, for such gems, translucency is The most ideal.
Clarity has actually been discussed previously. In theory, もちろん, the better the clarity, the fewer the defects, 価格が高いほど. Now we also know that it is very difficult to avoid flaws completely. If the flaws are unavoidable, then the location of the flaws has a great influence. The effect of a flaw of the same size in the center of the gemstone table and the edge of the gemstone waist is obviously different.
実際には, the most ideal place to hide the flaws of faceted gems is the waist edge. 一方では, this is the least conspicuous. 一方で, the flaws in this location are likely to be covered up during setting. The most undesirable thing is that the flaw is located at the culet, because due to the light reflected by the facets, the flaw at the culet may produce a lot of reflections in the gem, making the gem’s flaw appear much more serious than it actually is.