Bright cut:
A 57-sided round diamond, its shape and cutting surface arrangement are designed according to the maximization of luster, reflected light and aesthetic feeling.
Carat: A unit of weight for diamonds, equal to 200 milligrams, or one-fifth of a gram. In ancient India, the seeds of a plant called carob were used to measure the weight of precious stones, because these seeds weighed the same. Now carat is thought to have evolved from the ancient word carob. As it becomes more and more rare, the price of big diamonds is much higher than that of small diamonds.
Clarity: used to classify the purity or inclusion of diamonds.
Transparency levels include:
FL: Perfect-professionals observe under the magnification of 10, and there are no flaws inside and outside, which is the rarest and most precious among all cleanliness levels.
If: there is no flaw in the interior-professionals observe under the magnification of 10 times, there is no flaw in the interior, but there are tiny flaws on the diamond surface.
VVS- 1: Minimum defect level 1- Professionals only observed a tiny defect at the magnification of 10.
VVS-2: Minimum defect level 2- Minimum defect observed by professionals at magnification 10.
VS- 1: micro-defect level 1- 10 times magnification, micro-defects can be seen.
VS-2: Defect level 2- 10 times magnification, you can see several tiny defects.
SI- 1: defect grade 1- 10 times magnification, obvious defects are easy to observe.
SI-2: The defect grade is 2- 10 times magnification, and several obvious defects can be easily observed.
SI-3: defect level 3-defects that can be observed by professionals with naked eyes.
I- 1: serious defect level 1- visible defect.
I-2: Severe flaw level 2-Several flaws clearly visible to the naked eye, which reduce the luster of the diamond.
I-3: Three levels of heavy defects-several defects can be clearly seen by naked eyes, which not only reduce the luster of the diamond, but also endanger the structure of the diamond and are easy to break or appear gaps.
Cloud: A cluster of tiny inclusions inside a diamond. Tiny clouds have no effect on the flow of light, but large or many clouds will affect the luster of diamonds.
Color: Graded according to the color of diamonds. D is transparent and colorless, which is the rarest and most precious color. D-Z is in the normal color range and gradually increases in the grade of yellow and/or brown diamonds. Only professionals can tell the difference between two adjacent color grades (such as E and F) under special light, while most people can tell the difference between several grades (such as E and H) with a little practice. Colored diamonds, such as pink, red, blue and green diamonds are found every year, but they are very rare and extremely expensive. These colored diamonds are not suitable for the general color/price range, but are classified separately.
Color grading range:
D extremely white
E extremely white
F Bai Han+
Bai Han
H white
Pale white
K-L is slightly white
M, N-O, P-R, S-Z are light yellow.
Bottom tip: The bottom surface of a diamond. Preferably a small or medium bottom top. The big bottom tip will make the bottom of the diamond look like a hole because of light leakage. Without the bottom tip, the tip of a diamond is more likely to be damaged or broken.
Cut: usually refers to the shape (round, pear-shaped, oval, etc. ) and the structure of the diamond (the proportion of each part of the diamond after cutting). Regardless of shape, structure is the most important factor to determine the amount of refracted light.
Perfect cutting: Round diamond with perfect proportion (the percentage of height and the percentage of table top make the fire color and luster reach the best balance). This kind of diamond has the highest polishing grade and symmetry, which means that a lot of energy is spent in the comprehensive polishing process. These diamonds made by the best cutting technology have achieved the most perfect effect. Diamonds in perfect cut are more expensive than diamonds of all cut grades. This is determined by three factors: 1, it takes more time and technology to cut such diamonds; 2. This kind of diamond is in great demand and may not be the main one; In order to achieve perfect proportion, more parts of the original stone must be sacrificed.
Excellent cutting: diamond cutting meets very strict requirements of depth and table proportion. These excellent proportions maximize the fire color and luster of diamonds.
Good cutting: The cutting of diamonds is acceptable, but it is not in perfect proportion. These diamonds usually have very bright colors of light and fire and can be made into excellent jewelry.
General cutting: the diamond cutting ratio is not perfect. In order to maximize the weight of the original stone, the fire color and luster are sacrificed. Because this kind of diamond does not have the luster and flash that people expect, it is cheaper than excellent cutting.
Poor cut: Diamonds with poor cut look rigid. We don't recommend using this kind of diamond when making fine jewelry.
Full depth: the vertical distance between the tip of the diamond bottom and the table (the largest part at the top of the diamond).
Full depth ratio: the height of a diamond (the vertical distance from the table top to the bottom tip) divided by the width of the diamond. The luster and fire color produced by diamonds have strict requirements on the proportion of full depth. If the aspect ratio is too small or too large, the diamond will leak light, resulting in the loss of luster of the diamond.
Visually flawless: when observed with the naked eye, diamonds are flawless. Clarity grade SI- 1 and above usually belong to this kind of diamond.
Cutting: The polished surface of a diamond. For example, including the bottom tip, a bright round diamond has 58 facets.
Fire color: the colored light reflected inside the diamond. White light enters the diamond and is divided into seven colors like a prism. Good fire color can only be achieved in a good to excellent ratio. Huocai is also called "refraction" or "light scattering" in trade.
Fluorescence effect: Some diamonds will glow under ultraviolet light, usually blue light. Too strong fluorescence effect should be avoided, but weak fluorescence generally does not affect the appearance of diamonds. In fact, weak or moderate blue fluorescence is welcomed by some consumers because it will make cheaper yellow diamonds appear whiter or more transparent during the day.
Waist: the outermost part of a diamond. The base of jewelry is usually fixed on the diamond waist. The diamond waist can be rough (looks like sandblasting) or cut (polished like other parts of the diamond). Any kind is good, but it has a slight influence on the overall beauty of diamonds.
Inclusions: impurities in a diamond, such as spots or irregular diamond crystal structure. These impurities include clouds, cracks, other diamonds in big diamonds, liquid substances and so on. The content may be visible to the naked eye (usually with a resolution of SI-3 or lower), or it may only be visible after enlargement. The fewer inclusions, the higher the clarity grade, the rarer and the higher the value.
Structure: the quality of polishing and the proportion of diamonds after cutting. A good structure has a proportion that can maximize the luster and fire color of the diamond. Poor structure will make the light leak when it passes through the diamond, thus reducing the brilliance and fire color of the diamond.
Pavilion: The lower half of the diamond, from the lower waist to the bottom tip. If the pavilion is too deep or too shallow, it will cause the loss of light and the diamond will lose its fire luster.
Minute: the unit of measurement for the weight of a diamond. One cent equals one hundredth of a carat. A 0.5 carat diamond can also be called 50 cents. This unit does not refer to the number of knots.
Polishing: the degree of polishing on the surface of a diamond. The polishing grade ranges from poor to excellent. Good polishing is very important to maximize the luster of diamonds, but professionals are needed to distinguish the grades of polishing. Usually, some rough and granular lines can be removed from the extra parts, which can only be seen under a small magnifying glass or microscope.
Flash: the combination of fire color and luster. The diamond reflects the faint light from the cut surface. Old diamond dealers, including us, sometimes call it "Spark".
Symmetry: the overall uniformity of diamond cutting, and the degree of symmetry varies from poor to excellent. Poor symmetry will destroy the flash color of diamonds, because light will be lost when it is reflected from diamonds to the naked eye. We only recommend excellent symmetry.
Table: The largest part at the top of a diamond. The table top is too big or too small, indicating that the overall proportion is not good. Poor proportion will destroy the fire color and luster of diamonds.
Table ratio: the width of the table divided by the total diameter of the diamond. Table proportion is very important to the flash of diamond and the generation of fire color.