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IA American Jewellery Institute American Jewellery Institute, American Jewellery Institute, an international authoritative diamond testing institution.

A girdle diamond has the largest circumference.

In the grinding process of waist crack of waist seal steel ring, there may be tiny cracks on diamond waist. Slight cracks can be completely removed after re-grinding.

Waist seal ratio is the percentage of waist thickness to average diameter, and the calculation formula is as follows: lower waist thickness ratio = waist thickness/average diameter × 100% growth or grain diamond grain. These thin lines or planes are internal defects that can only be detected when the diamond rotates at a very low speed. They appear at a certain angle and then disappear in an instant.

Gypsy inlay Gypsy inlay This is a common inlay method for men's diamond rings. The top of the ring arm is thick, and the main stone is embedded in the center of the dome. The design without metal claws makes the ring lines more concise and smooth.

Heart-shaped and arrow-shaped cutting cuts a round diamond shape with eight arrows and eight hearts, with eight arrows above and eight hearts below. The cutting loss of standard blank with eight arrows and eight centers is large.

Heart diamond heart

HRD (Belgian Diamond High Council): Belgian Diamond High Council, an international authoritative diamond organization and testing institution. The highest official management body of the Belgian diamond industry. The four diamond exchanges in Antwerp, the Belgian Federation of Diamond Exchanges, relevant trade organizations and trade unions all have human rights defenders as their spokespersons. The goal of HRD is to develop and protect Belgium's diamond trade and industry. The organizational structure of HRD is the General Assembly, Board of Directors, Council, General Management Office, Diamond Bureau, Gemological Institute, Diamond Science and Technology Research Center and Certificate Department.

Independent Gem Laboratory Company is the authoritative diamond testing organization in the United States.

The illusion mosaic is more interesting than others, because the metal next to the main stone is carefully designed to make the main stone look bigger and more charming.

Inclusions Inclusions are naturally formed, so every diamond has different flaws inside, and every diamond is different. You can know the number, size and types of these natural birthmarks from the clarity grading rules. Inclusions can be divided into cloud, crystal, needle and feather. The position of inclusions also directly affects the clarity and value of diamonds.

The original diamond mesh with serrated natural concave surface is concave as the natural mesh inside the diamond.

There is no defect inside, if an experienced grader observes the diamond with a 30-fold magnifying glass under a standard light source, and no defect features are found inside the diamond.

Original crystal plane: the natural crystal plane that remains at or near the waist of the diamond to maintain the highest quality.

Laser drilling laser marking marks left by laser and chemical substances to remove dark inclusions in diamonds. Tubular or funnel-shaped marks are called laser holes. Can be filled with high refractive index glass.

LC-level experienced raters observed it with a magnifying glass of 10 times under standard light source, and defined it without finding any defect features. In other words, the diamond does not contain any defect features larger than 5 microns and has sufficient brightness. (highest definition in China standard). The following conditions still belong to LC level: 1. The extra facets are located in the pavilion, and the crown is invisible. 2. The primary crystal plane is located at the waist line, which does not affect the transparency. 3. There are extremely subtle features inside and outside the diamond, and the triangular facet between the low waist and the main facet of the pavilion can be removed by slight micro-polishing.

Fluorescent intensity contrast sample's main stone A set of standard circular cut diamond samples with calibrated fluorescent intensity grades consists of three pieces, which represent the lower limits of the three grades in turn.

Blue-pointed cut diamond

Mixed cutting mixed cutting this cutting method has both stepped cutting surface and bright cutting surface. Mixed cutting gives diamonds both the beauty of beryl and the light of bright cutting.

Mohs hardness international hardness scale.

Natural surface texture A natural growth trace on the surface of a diamond.

A part of the waist of a diamond, where tiny needle-like cracks go deep into the interior.

Nickel is often added to K platinum.

NGTC (National Jewellery and Jade Quality Supervision and Inspection Center)

The National Gemstone Testing Center is a national professional quality inspection institution authorized by the relevant state departments according to law, and it is the authoritative institution for jewelry and jade testing in China. The inspection center provides entrusted inspection services to the society, undertakes national market supervision and inspection, arbitration inspection, import and export commodity inspection, and formulates and revises relevant national standards. The main reviser of national diamond standard.

Oval cut diamond oval

P Inexperienced graders can easily find defects with naked eyes, which will affect the "fire" of diamonds.

The pavilion has 24 or 25 sides above the waist.

Pavilion main surface Pavilion main surface quadrilateral surface.

The angle between the main surface of futon and the horizontal plane of waist.

Pavilion proportion is the percentage of pavilion depth relative to the average diameter. The calculation formula is as follows: pavilion depth ratio = pavilion depth/average diameter × 100% Pav inlay technology for small diamonds. Diamonds are closely inlaid with each other, so there is no metal. The inlaid surface looks all paved with diamonds.

A wax cavity mold is a jewelry making process.

Pear diamond pear-shaped

Tiny natural inclusions in diamonds.

Platinum Platinum is an ideal metal for setting diamonds, and platinum is its symbol.

Diamonds with a point weight less than 1 carat are usually measured in "minutes", 1 carat = 100 minutes.

Polishing grinding/polishing refers to the process that the cutting technician grinds the diamond embryo and makes the diamond section. The polishing degree of diamond surface is an important index to measure the quality of diamond.

Bad cutting Bad cutting refers to the angle at which the technician cuts the valve surface and the proportion of each part of the diamond after cutting. Cutting too deep or too shallow is called bad cutting. When the proportion of the diamond below the waist is too deep or too shallow, the light will flow away from the bottom or side and lose its luster, and the value of the diamond will become lower.

Princess cut diamond Princess square improved bright cut diamond

Pointed setting/Tiffany setting Pointed setting is a slender gem with four or six claws. This kind of inlay shows the beauty of diamonds, which is convenient for observing the lathe work, color and clarity of diamonds. It was invented by Tiffany, a famous jeweler in new york, and is now widely used.

The percentage of the value of each face of a diamond relative to the average diameter.

Bright cut diamond

Ring size The size of the ring is called the hand inch, which is expressed by numbers. The size of oriental hand is between 8 and 24.

Rose gold Rose gold contains 75% gold alloy.

Circular bright cutting circular drilling ideal cutting, also known as Torkovsky cutting. It's the Polish mathematician Marshall. Marcel Tolkovsky of Tolkovsky (1899 ~ 199 1) first calculated the cutting equation that theoretically made the diamond reflect the most light in 19 19. The width of the platform should be 53% of the total width, and the angles of the pavilion should be 40 degrees and 45 degrees. There are 57 or 58 faces.

Rhodium Rhodium is a platinum group metal.

Circular diamond-shaped circle

Shallow cutting is too shallow, which refers to the angle at which the technician cuts the valve surface and the proportion of each part of the diamond after cutting. If the proportion of diamonds below the waist is too shallow, the light will flow away from the bottom or side and lose its luster. The value of diamonds has also become lower.

Shape refers to the type of diamond, such as circle, triangle, square, olive pointed, pear-shaped, oval or heart-shaped.

Step cutting steps cut a first-class cutting surface like stairs. Beryl and long step cutting are examples of step cutting.

A triangular facet between the main facet of the star-shaped faceted crown and the mesa.

It is easy to find small defect features with a magnifying glass of 10 times for experienced raters of SI level who are slightly included. According to the size, location and number of defect features, it is decided whether it is SI 1 (a few visible inclusions) or SI2 (some visible inclusions).

When a diamond reflects light, a little light from the cut surface is called flash.

Silver is often added to K platinum.

Solitaire single gem inlay.

The horizontal symmetry of each part around the center point obtained by cutting and polishing symmetrical diamonds, that is, the arrangement of cutting planes and their mutual angles. Like ratio, it is also an important index to evaluate cutting. If the lathe work and proportion of a diamond are excellent, symmetrical cutting will make the flash and flame more intense. The evaluation of symmetry in foreign certificates is more detailed, and the order from high to low is ideal (ID), excellent (EX) (or premium), very good (VG), average (F) and poor (P).

An octagonal facet of a crown.

Table Proportion Table width is the percentage of table width relative to the average diameter. The calculation formula is as follows: table width ratio = table width/average diameter × 100% tensile force sets the pressure of metal arms on both sides of the wall inlay to fix the main stone urgently.

Total depth The vertical distance between the table top and the bottom tip of a full depth diamond.

The total depth ratio is the percentage of the total depth to the average diameter, and the calculation formula is as follows: total depth ratio = total depth/average diameter ×100% t.w. (total weight).

The total number of carats of diamonds set in jewelry.

Tapered long stick-pointed stepped diamond, the cutting surface is stepped and the long side gradually narrows.

Trillion triangle is a kind of triangular diamond with 50 cutting faces, which is usually used as a foil to accompany the tiny linear traces of twin Wisp polished diamonds due to improper polishing. They are parallel to each other at the same moment.

Upper main facet Crown main facet (kite face)

Crown quadrilateral facet.

A triangular facet between the waist and the coronal major surface on the upper major surface.

Very, very slight VV S experienced graders can find tiny defects with a 30x magnifying glass. It is extremely difficult. According to the size, location and number of defect features, it is decided whether it is VVS1(less inclusions at 30x) or VVS 2 (more inclusions at 30x).

Very slight inclusion VS experienced graders can find small defect features with a magnifying glass of 10 times. The difficulty is not too difficult. According to the size, location and number of defect features, it is decided whether VS1(less inclusions at10x) or VS2 (more inclusions at10x).

Whiteboard or white paper used as a colorimetric background has no obvious directional reflection.

Platinum Platinum is a white alloy containing 75% gold.