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Gemstone Evaluation Criteria And Classification Of Gemstones

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By Author: Saif Saiyed
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There are four main criteria for evaluating gems that can be applied to gems of inorganic origin, for example, diamond, ruby, sapphire, emerald, etc. They sound as follows: Color (color), purity (clarity), Cut (cut), weight (carat weight).
Color
Undoubtedly, color will always be a fundamental factor in the evaluation of precious stones. The color of the faceted insert is characterized by three criteria: hue, tone, intensity (saturation). We will analyze each one individually.
He is an important criterion, especially for stones such as emerald, ruby. Why? The fact is that these gems have one primary color, for emerald - green, for ruby - red. And it is in this case, the shade (color combination of the main color) is very important in assessing the color of the stone. For example, emerald, the main color is green. The hue may be yellow-green, blue-green. Ruby, the main color is red. Possible shades: brown-red, violet-red, orange-red. For stones such as topaz, tourmaline, this criterion is poorly applicable, because these gems themselves have many different colors. And the concrete color of names is a specific value.
Tone is a measure of darkness. This value can be displayed as a percentage. From 0% - the palest to 100% - the darkest (opaque), 60-80% - optimal.
Intensity - the saturation (brightness) of a color. A very important factor. When the hue and tone of the precious insert is perfect, the degree of saturation greatly affects the price of the gem, making it more expensive or cheaper.
Purity
Cleanliness is something that should not be neglected when you buy stones, such as topaz, citrine, amethyst, quartz. The fact is that in nature such gems are very common. And a good indicator of cleanliness for them is VVS - IF (FL), which in general is not uncommon. Another question is when you get an emerald, a demantoid, an unclarified ruby or a large cabochon of pomegranate, a dark saturated color. Here, purity does not play a primary role in evaluating a gem. Emerald, for example, is extremely rarely pure, as is ruby. In this case, the main role is played by color, tone and degree of transparency. You can purchase a pale, yellow-green emerald with purity VS for a relatively small price. However, you will pay a lot more for a bright, rich Zambian emerald of the same weight, but with a purity of I2 - I1.
Faceting
Cutting is an essential attribute of a gemstone’s valuation, but not the most important. The degree of importance of the quality of the cut increases when the master granite is relatively inexpensive, common material. For example - topaz, citrine, amethyst, pomegranate. There is no point in chasing the mass of the finished stone to the detriment of the quality of the cut, because in the end you will get a "dead, lifeless" stone. Therefore, the main task of the master is to make this gem play, sparkle, and sparkle, regardless of how much mass of the workpiece he grinds until he reaches the desired result.
When you need to cut a rare gemstone with a small mass, for example, cornflower blue sapphire or a Burmese unbleached ruby, then the yield of the mass is very important. And the quality of the cut goes to last place, as this is the last criterion that will be paid attention to when evaluating such a rare jewelry insert.
The weight
When evaluating gemstones, weight plays a final role. Everything is simple here, the more the stone weighs, and the more expensive it is. And the price of a gem in some cases increases out of proportion to weight. As soon as the weight of a stone approaches a certain ceiling, its value grows in a geometric rather than arithmetic progression in relation to its mass.
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