淨度等級   Clarity  Grade                

淨度 ( Clarity ) 乾淨程度，指寶石不含表面缺隙與內含物的相對程度。

淨度等級 ( Clarity grade ) 對於存在於鑽石表面或內部的淨度特徵所作的專業分析，是依據淨度特徵的明顯程度，及如何影響寶石的堅固性來評定，

通常以一專業的術語來表達，GIA的淨度分級系統分為 以下等級：

    IF  -  Internally  Flawless                              

內無瑕 IF-Internally Flawless

若IF級再加上外表無瑕則為Flawless

     VVS1  -  Very  Very  Slightly  Included 1            

極輕微瑕級 1

VVS1 - Very Very Slightly Included 1

     VVS2  -  Very  Very  Slightly  Included 2             

極輕微瑕級 2

VVS2 - Very Very Slightly Included 2

     VS1  -  Very  Slightly  Included 1                       

輕微瑕極 1

VS1 - Very Slightly Included 1

     VS2  -  Very  Slightly  Included 2                    

輕微內含二級

VS2 - Very Slightly Included 2

     SI 1  -   Slightly  Included 1                           

微內含一級

SI1 - Slightly Included 1

     SI 2  -   Slightly  Included 2                            

微內含二級

SI2 - Slightly Included 2

SI2 以下尚有SI3,I1,I2,I3