WILLS JEWELLERY is a Hong Kong local brand jewelry and gemstone specialty store that specializes in providing customers with exquisitely designed and value-for-money jewelry. As natural gemstone experts, the WILLS JEWELLERY team has more than ten years of experience in gem procurement. All gemstones are purchased directly from the place of origin. After careful internal identification procedures, they ensure that they meet the most stringent requirements of the brand. Finally, they are handed over to international certification agencies for scientific testing of gemstones. Authentication. In addition to the professional purchasing team, WILLS JEWELLERY's jewelry design team is always carving and painting all kinds of jewelry for customers. Whether it is our own design or the WILLS Tailor Made service, our designers will do their best to serve our customers, combining traditional top-notch jewelry craftsmanship to create your own unique and moving story, evoking your most profound memories.
WILLS DIAMOND GIA Diamond Evaluation Criteria "4C"
The GIA Gemological Institute of America pioneered the diamond grading system, called the 4C standard, which unified the global grading criteria for diamond quality and became the recognized identification standard in the industry today ; it also allows consumers to accurately understand the quality and characteristics of the diamonds they choose, and its significance. major.
The 4C standards include: Carat weight, Clarity , Color, and Cut . Today, the 4C standards have been widely used in diamond quality certification processes around the world.
The 4C standards include: Carat weight, Clarity , Color, and Cut . Today, the 4C standards have been widely used in diamond quality certification processes around the world.
1.Carat weight •Carat is the unit of weight of diamond.
- Tool for measuring diamond weight, carob seed → mechanical chain scale → electronic carat scale.
One carat = 100 points = 0.2 grams
- The weight of a diamond is recorded to the second decimal place below one carat, and the weight to the third decimal place is not counted. Unless the third decimal place is 0.009, it can be rounded up to 0.01.
- Diamond sieves usually use a measuring tape of each disc as the approximate size, and the diameter of each small hole represents each weight of diamond.
2. Clarity •The classification of clarity grades is based on observation under ten times magnification.
- The clarity of a diamond is its purity and transparency. Clarity characteristics are called inclusions on the inside and gaps on the outside. Factors such as the size, number, location, nature, and conspicuity of features determine the clarity grade.
- Although most diamonds contain very fine inclusions, these inclusions do not affect the beauty of the diamond itself. However, the fewer and smaller the inclusions, the greater the impact on the penetration of light into the diamond. The lower it is, the more beautiful the diamond will shine.
|
English name |
Chinese name |
Definition |
|
|
FL |
Flawless |
Flawless |
Flawless inside and out |
|
IF |
Internally Flawless |
internally flawless |
Although there are no defects internally, there are very minor defects externally. |
|
VVS1 |
Very Very Slightly Included 1 |
Very Slightly Contains Level 1 |
Very slight flaws, difficult to detect |
|
VVS2 |
Very Very Slightly Included 2 |
Very Slightly Contains Level 2 |
Very slight flaws, difficult to detect |
|
VS1 |
Very Slightly Included 1 |
Slightly Contains Level 1 |
Tiny flaws, difficult to observe |
|
VS2 |
Very Slightly Included 2 |
Slightly Contains Level 2 |
Tiny flaws, difficult to observe |
|
SI1 |
Slightly Included 1 |
Micro inclusion level 1 |
Obvious flaws are easily noticeable but cannot be seen with the naked eye |
|
SI2 |
Slightly Included 2 |
Micro inclusion level 2 |
Obvious flaws are easily noticeable but cannot be seen with the naked eye |
|
I1 |
Included 1 |
Contains level one |
Obvious flaws, visible to the naked eye |
|
I2 |
Included 2 |
Contains secondary |
Large and many defects are visible to the naked eye and affect its brightness |
|
I3 |
Included 3 |
Contains three levels |
Serious flaws, which have reduced the transparency and brilliance of the diamond, the boundary of industrial diamonds |
3. Color Color • Diamond color grading
According to GIA's color grade table, there are 23 grades from D to Z in English letters, ranging from the completely colorless and extremely rare D to the yellowish-brown Z, with different shades of color.
D. E. F. grade belongs to the colorless range
D. E. F. grade belongs to the colorless range
G . H . I belongs to the nearly colorless range
J . K . L is slightly light yellow
M. N and below are light yellow.
In addition to the high value of colorless diamonds, the value of colored diamonds is also very high.
4. Cut • The cut is the shape and style of the diamond.
Diamond cutting shapes are usually divided into two categories: round diamonds and fancy diamonds. The most common diamond cut is the brilliant round diamond. Fancy diamonds are also called fancy cuts, which mainly include: cushion-shaped, emerald-shaped, heart-shaped, drop-shaped, princess-shaped, marquise-shaped, oval, and minefield. en form etc.
- Nature gives each rough stone different characteristics. The quality of its finished product is closely related to the original stone, and cannot be changed by manpower. However, through the cutting skills of the cutter, its most beautiful side can be brought out, and Create maximum value.
- What makes a diamond so outstanding depends entirely on its cutting. If it is cut in good proportions, the diamond can exert its maximum optical properties, showing perfect white light, sparkle, and fire.
Other relevant standards:
Fluorescence reaction
Fluorescence reaction refers to the reaction color light that occurs when a diamond is exposed to ultraviolet light.
Fluorescence reaction has two main effects on diamonds:
Fluorescence reaction refers to the reaction color light that occurs when a diamond is exposed to ultraviolet light.
Fluorescence reaction has two main effects on diamonds:
1. Affects fire--the stronger the fluorescence, the more opaque the diamond will appear.
2. Change the color - the same diamond with color H, a diamond with moderate fluorescence
The stone looks whiter; on the diamond identification certificate, fluorescence reaction is a test item
Medium (moderate) fluorescence and above will have an impact on the price of diamonds.
