GIA Diamond Grading Standards

The GIA (Gemological Institute of America) pioneered the diamond grading system known as the 4C standard,Standardized global grading criteria for diamond quality,It has become the industry-recognized grading standard today; This allows consumers to accurately understand the quality and characteristics of the diamonds they purchase, which is significant.The 4C standard includes: Carat, Clarity , Color, Cut; To this day, the diamond quality certification process around the world has widely adopted the 4C standard.

1.Carat•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 a diamond 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 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. The size, number, position, nature, and visibility of these 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.

New Column	New Column	New Column	New Column
	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 brightness
I3	Included 3	Included 3	Severe flaws, reduced diamond transparency and brightness, the boundary of industrial diamonds

WILLS JEWELLERY diamond collection

WILLS JEWELLERY selects diamonds with the strictest requirements of F/G color and SI-VS clarity, set in their own jewelry designs, creating dazzling diamond pieces that captivate the eye. Our store guarantees that every diamond is natural and not synthetic, giving you the utmost confidence.

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18K white gold round diamond bracelet (half circle diamonds) - WILLS JEWELLERY

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Cross ribbon diamond pendant - WILLS JEWELLERY

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Cross-shaped diamond bracelet - WILLS JEWELLERY

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Flower halo round diamond earrings - WILLS JEWELLERY

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3.Color•Diamond color grading

According to the GIA color grading scale, there are 23 levels from the completely colorless and extremely rare D to the Z with brownish hues, varying in depth of color.•D. E. F. grades belong to the colorless range, G. H. I are near colorless, J. K. L are faint yellow, and M. N and below are light yellow.•In addition to colorless diamonds being highly valued, colored diamonds are also very valuable.

4.Cut•Cut refers to the shape and style of the diamond

The shape of the diamond's 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 on cutting; if the cutting proportions are good, the diamond can exhibit its maximum optical properties, presenting perfect white light, sparkle, and fire.FluorescenceFluorescence refers to the color light reaction that occurs when a diamond is exposed to ultraviolet light.Fluorescence mainly affects diamonds in two ways:1. Affects fire -- stronger fluorescence makes the diamond appear less transparent.2. Changes color -- a diamond with medium fluorescence of the same color H appears whiter;on the diamond grading certificate, fluorescence istested asMedium and above, which will affect the price of the diamond.

WILLS JEWELLERY's GIA matching diamonds

What makes WILLS JEWELLERY's matching diamonds exceptional? The answer is that we spare no expense in the polishing process, deliberately cutting the diamonds into pairs. Many so-called matching diamonds in the market are simply two similar diamonds put together; WILLS's matching diamonds are crafted by artisans who simultaneously polish two uncut rough stones into matching pairs based on the selected ideal shape, ensuring that both diamonds are cut identically, which is what qualifies them as matching diamonds.

Buy matching diamonds

WILLS JEWELLERY offers different shapes of white and colored diamonds ranging from 30 points to over 5 carats, all diamonds are GIA certified. If you need a quotation for GIA diamonds, please fill in your requirements in the information form below or inquire via Whatsapp, and our store will reply to you as soon as possible.