WILLS JEWELLERY is a local brand jewelry store in Hong Kong, specializing in providing customers with exquisitely designed, value-for-money jewelry. As experts in natural gemstones, the WILLS JEWELLERY team has over ten years of gemstone procurement experience, with all gemstones sourced directly from their origin, undergoing careful internal evaluation procedures to ensure they meet the brand's strictest requirements, and finally submitted to international certification agencies for scientific verification. In addition to a professional procurement team, the WILLS JEWELLERY design team is constantly creating various jewelry pieces for customers. Whether it is self-designed or WILLS Tailor Made service, the designers are dedicated to serving customers, blending traditional top-notch jewelry craftsmanship to create a unique and touching story that evokes your deepest memories.
WILLS DIAMOND GIA diamond grading standard "4C"
The GIA (Gemological Institute of America) pioneered the diamond grading system known as the 4C standard, which unified global grading criteria for diamond quality, becoming the industry-recognized standard today; it also allows consumers to accurately understand the quality and characteristics of the diamonds they purchase, which is significant.
The 4C standard includes: Carat weight, Clarity, Color, Cut; to this day, the diamond quality certification process worldwide has widely adopted the 4C standard.
The 4C standard includes: Carat weight, Clarity, Color, Cut; to this day, the diamond quality certification process worldwide has widely adopted the 4C standard.
1.Carat weight•Carat is the unit of weight for diamonds.
- Tools for measuring diamond weight include carob seeds → mechanical scales → electronic carat scales.
One carat = 100 points = 0.2 grams
- The weight of diamonds is recorded to the second decimal place below one carat, with the third decimal place not counted unless the third decimal is 0.009, which can be rounded up to 0.01.
- Diamond sieves are usually measured by the approximate size of each round piece, with the diameter of each small hole representing the weight of each type of diamond.
2.Clarity•Clarity grading is based on observation under ten times magnification.
- The clarity of a diamond refers to its purity and transparency. Internal characteristics are called inclusions, while external characteristics are called blemishes. Factors such as size, quantity, location, nature, and visibility of the characteristics determine the clarity grade.
- Although most diamonds contain extremely fine inclusions, these inclusions do not affect the beauty of the diamond itself. The fewer and smaller the inclusions, the lower the impact on light penetration within the diamond, making the diamond's brilliance more beautiful.
|
|
English name |
Chinese name |
Definition |
|
FL |
Flawless |
Flawless |
No internal or external flaws. |
|
IF |
Internally Flawless |
Internally Flawless |
No internal flaws, but there are extremely minor external flaws. |
|
VVS1 |
Very Very Slightly Included 1 |
Very Very Slightly Included 1 |
Extremely minor flaws, difficult to detect. |
|
VVS2 |
Very Very Slightly Included 2 |
Very Very Slightly Included 2 |
Extremely minor flaws, difficult to detect. |
|
VS1 |
Very Slightly Included 1 |
Very Slightly Included 1 |
Minor flaws, not easy to observe. |
|
VS2 |
Very Slightly Included 2 |
Very Slightly Included 2 |
Minor flaws, not easy to observe. |
|
SI1 |
Slightly Included 1 |
Slightly Included 1 |
Easily noticeable obvious flaws, but not visible to the naked eye. |
|
SI2 |
Slightly Included 2 |
Slightly Included 2 |
Easily noticeable obvious flaws, but not visible to the naked eye. |
|
I1 |
Included 1 |
Included 1 |
Obvious flaws, visible to the naked eye. |
|
I2 |
Included 2 |
Included 2 |
Large and numerous flaws, visible to the naked eye, affecting its brilliance. |
|
I3 |
Included 3 |
Included 3 |
Severe flaws have reduced the diamond's transparency and brilliance, the boundary for industrial diamonds. |
3.Color•Diamond color grading
According to the GIA color grading scale, there are 23 grades from the letter D to Z, ranging from completely colorless D, which is extremely rare, to Z, which has a yellow-brown tint, with varying shades in between.
D. E . F. grade belongs to the colorlessrange
D. E . F. grade belongs to the colorlessrange
G . H . I Belonging to the near colorless range.
J . K . L are faint yellow.
M . N below is light yellow.
In addition to colorless diamonds having high value, colored diamonds also have very high value.
4.Cut•The cut refers to the shape and style of the diamond.
The shape of the diamond cut is usually divided into two main categories: round diamonds and fancy diamonds. The most common is the brilliant round cut, while fancy diamonds, also known as fancy cuts, mainly include: cushion, emerald, heart, pear, princess, marquise, oval, radiant, etc.
- Nature endows each rough stone with different characteristics, and the quality of the finished product is closely related to the rough stone, which cannot be changed by human effort; however, through the cutting skills of the cutter, the most beautiful side can be presented, creating maximum value.
- The factors that make diamonds so outstanding rely entirely on cutting and polishing. If the cutting and polishing ratio is good, the diamond can exhibit its maximum optical characteristics, presenting perfect white light, sparkling light, and brilliance.
Other related standards:
Fluorescence reaction
The fluorescence reaction refers to the color light that occurs when a diamond is exposed to ultraviolet light.
The fluorescence reaction mainly has two effects on diamonds:
The fluorescence reaction refers to the color light that occurs when a diamond is exposed to ultraviolet light.
The fluorescence reaction mainly has two effects on diamonds:
1. Affects brilliance--the stronger the fluorescence, the more opaque the diamond will appear.
2. Change of color--a diamond with medium fluorescence that is also color Hdiamond
the stone lookscomparatively white;On the diamond certification certificate, the fluorescence reaction isTest items
Medium fluorescence and above will affect the price of diamonds.
