Various gemstone grading

Various institutions around the world (such as UGL, GIA, etc.) have given independent gem grading systems, but unfortunately there is no unified gem grading system in the world. The grading standards for gemstones in China have not yet been introduced. Therefore, the gem grading system of the New York Jewelry Agency and its gemstone grading certificate are introduced. According to New York Jewelry Standards, gemstones can be graded in terms of color, clarity, weight, cutting, and processing.

Emerald grading

colour

Color is an important factor in determining the value of emeralds. The color levels of emeralds from high to low are: Intensive, Vivid, Deep, Medium, and Soft.

Cleaness

Clarity is one of the main indicators for evaluating emeralds. The purity of emeralds is graded from high to low: no flaws (FL/IF), extremely fine impurities (VVS1/VVS2), very fine impurities (VS1/VS2), fine impurities (SI1/SI2), impurities (I1/ I2/I3).

weight

In the jewelry industry, such as diamonds, carat is a unit used to measure the weight of a gem. 1 carat is equal to 0.2 grams. The 1 carat emerald is slightly smaller than the 1 carat diamond.

Cutting

Cutting is similar to clarity, and the proportion of emerald value is lower than color. This is not the same as diamonds: the value of a diamond does not differ much in terms of color, clarity, weight, and cutting.

deal with

The definition of emerald processing comes from AGTA (American Jewelry Trading Association), the most authoritative organization for gem processing, testing and trading. Common treatments include: Heated, Unheated, Dyed, Filling, Diffusion, and Cedar.

Ruby grading

colour

Color is an important factor in determining the value of rubies. The color of ruby ​​is graded from high to low: PigeonBlood, Deep, Red, Purplish, Pink.

Cleaness

Clarity is one of the main indicators for evaluating rubies. The clarity of ruby ​​is graded from high to low: no flaws (FL/IF), extremely fine impurities (VVS1/VVS2), very fine impurities (VS1/VS2), fine impurities (SI1/SI2), impurities (I1/I2) /I3).

weight

In the jewelry industry, such as diamonds, carat is a unit used to measure the weight of a gem. 1 carat is equal to 0.2 grams. A 2 carat ruby ​​is not twice the size of a 1 carat ruby, but its price is much higher.

Cutting

Cutting is similar to clarity, and the proportion of ruby ​​is lower than the color. This is not the same as diamonds: the value of a diamond does not differ much in terms of color, clarity, weight, and cutting.

deal with

The definition of ruby ​​treatment comes from AGTA (American Jewelry Trading Association), the most authoritative organization for gem processing, testing and trading. Common treatments include: Heated, Unheated, Dyed, Filling, Diffusion.

Sapphire classification

colour

Color is an important factor in determining the value of sapphire. The color of sapphire is graded from high to low: Intensive, Vivid, Royal, Medium, Sky, Navy, GrayBlue. .

Cleaness

Clarity is one of the main indicators for evaluating sapphire. The sapphire's clarity is graded from high to low: no flaws (FL/IF), extremely fine impurities (VVS1/VVS2), very fine impurities (VS1/VS2), fine impurities (SI1/SI2), impurities (I1/I2) /I3).

weight

In the jewelry industry, such as diamonds, carat is a unit used to measure the weight of a gem. 1 carat is equal to 0.2 grams. A 2 carat sapphire is not twice the size of a 1 carat ruby, but its price is much higher.

Cutting

Cutting is similar to clarity, and the proportion of sapphire is lower than the color. This is not the same as diamonds: the value of a diamond does not differ much in terms of color, clarity, weight, and cutting.

deal with

The definition of sapphire treatment comes from AGTA (American Jewelry Trading Association), the most authoritative organization for gem processing, testing and trading. Common treatments include: Heated, Unheated, Diffusion.

Tanzanite classification

colour

The color of tanzanite is divided into two series, blue-violet and purple-blue. According to the color depth and saturation, it is divided into A, A+, 2A, 2A+, 3A, Block-D from shallow to deep. The higher the concentration and saturation of the color, the higher the value.

Cut

The cutting of tanzanite refers to the shape, cutting surface and cutting ratio of tanzanite. The tanzanite that has been cut to perfection is dazzling when the light passes through its perfectly proportioned, strictly symmetrical cutting surface to form the maximum radiation. The better the cut, the higher the value.

Cleaness

The clarity of tanzanite refers to its natural inclusions and mineral characteristics. According to the cleanliness, from good to bad, they are divided into: IF, VVS, VS, SI, P. The better the clarity, the higher the value.

quality

The heavier the quality, the higher the value.

Tourmaline classification

colour

Color refers to the color of a gemstone that appears under natural light. It is the key place to evaluate the tourmaline. The purer, richer the color, the better the quality. If the gems are green or black, perhaps the lighter colors will affect the value of the gems. Ordinary can be divided into deep red, red, medium red, light red, light red five. The green tourmaline is divided into five levels: dark green, green, medium green, light green, and light green.

Brightness

The brilliance of the gem is the level at which the gemstone allows the visible light to pass through. It is the most important factor in evaluating the quality of the gemstone. The quality of the tourmaline must be clear. The transparency of the tourmaline is generally divided into five categories: bright, sub-transparent, semi-transparent, semi-transparent, and unclear. Take the red tourmaline as an example, as long as the first and second grade rubies can be called high quality gem grade. At present, some red bismuths with very low prices and large granules can be seen in the market. It is because the illuminance is not up to the gem level. Although a single merchant has called it a high-quality tourmaline, it can only be regarded as a tourmaline in practice. Therefore, the value of tourmaline is reflected in the transparency.

Cut

Cuts are also important for the length of the tourmaline. The reason why the tourmaline has a beautiful fire color is that cut is one of the main elements. The cut size of the tourmaline can refer to the specification of the diamond.

Cleaness

Clarity refers to the number of flaws contained in the tourmaline. There are many impurities and ice cracks in the tourmaline. The clarity of tourmaline is based on the naked eye. It is extremely difficult to see, difficult to see, visible, easy to see, and easy to see. The first and second grades are high quality gemstones. The high purity of the tourmaline is extremely rare, and the high quality of the tourmaline clarity can greatly enhance the value of the tourmaline.

quality

The quality of tourmaline can be divided into 1~2 carats, 3~5 carats, 5~10 carats, and the number of 5 carats is multiplied. The most treasured value of the tourmaline above 15 carats is also the main force of the tourmaline collection.

Cat eye grading

colour

There are many kinds of cat's eyes, mainly yellow with other shades. The best color is honey yellow 60,000 yuan, others are yellow green, brown green is more than 70,000, brown yellow is the most expensive, each one is above 90,000 yuan. The brown price is 30,000 yuan.

Eyeliner

The eyeliner is required to be straight, uniform, continuous and continuous, clear and not turbid, bright and not dark.

weight

For gemstones, the greater the weight, the more geometrically increased the value of the gemstone. For the cat's eye, it is no exception, and there are few on the market, while the diameter is greater than 125px.

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