淨度   Clarity

淨度以鑽石內的內含物多少決定。內含物可能是天然的雜質或裂痕。內含物的數量、位置、大小等都會影響評級。通常使用10倍放大鏡觀察鑽石內部及表面內含物的大小、數量、分布及對鑽石光彩影響的程度，分出等級。主要來說，淨度分級如下：

• IF - 「Internally Flawless」，內部無瑕。在十倍放大鏡下只有表面有輕微花痕。
• VVS1, VVS2 - 「Very Very Slight」，非常非常小。在十倍放大鏡下只有很難看見的內含物。VVS1淨度高於VVS2。
• VS1 and VS2 - 「Very Slight」，非常小。在十倍放大鏡下可看見內含物，但肉眼難以辨認。VS1淨度高於VS2。
• SI1 and SI2 - 「Slight Inclusions」，小型內含物，肉眼可能看見。
• I1, I2 and I3 - 「Imperfect」，清楚的內含物，可以被肉眼看見。

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​The clarity is determined by the amount of inclusion in the diamond. The inclusions may be natural impurities or cracks. The number, location, size, etc. of the inclusions will affect the rating. A 10x magnifying glass is usually used to observe the size, quantity, distribution and the degree of influence on the brilliance of the diamond inside and surface of the diamond. Mainly, clarity is graded as follows:
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The GIA Diamond Clarity Scale has 6 categories, some of which are divided, for a total of 11 specific grades.
(FL) No inclusions and no blemishes visible under 10x magnification
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• Flawless (FL) No inclusions and no blemishes visible under 10x magnification
• Internally Flawless (IF) No inclusions visible under 10x magnification
• Very, Very Slightly Included (VVS1 and VVS2) Inclusions so slight they are difficult for a skilled grader to see under 10x magnification
• Very Slightly Included (VS1 and VS2) Inclusions are observed with effort under 10x magnification, but can be characterized as minor
• Slightly Included (SI1 and SI2) Inclusions are noticeable under 10x magnification
• Included (I1, I2, and I3) Inclusions are obvious under 10x magnification which may affect transparency and brilliance

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