Diamond Education | Clarity grading chart

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Diamond Clarity

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Clarity grading chart

Below are the foremost clarity grading scales ranged together with impressions of clarities drawn in top view on diamond diagrams.

Please see below the scale for important explanations on:

Gemological Institute of America GIA	American Gem Society	Scandinavian SCAN.D.N.		CIBJO Confederation International de la Bijouterie, Joaillerie, Orfevrierie des Diamantes.	HRD Hoge Raad voor Diamant Diamond High Council	Russian < 0.29 ct	Russian > 0.30 ct
		Main Grades <0.47 carats	Sub grades >>0.47 carats
FL (flawless)	0	Loupe clean	FL	Loupe clean Free from inclusions and bearding	Loupe clean. Inclusions that do not exceed 5 micron	1	1
Internally flawless	1		IF
VVS₁ (very, very slightly included)		VVS	VVS₁	VVS (VVS₁, VVS₂) Very, very small inclusion(s), very hard to find with a 10x loupe	VVS₁ - VVS₂ Inclusions that are visible through table have average sizes of 12 micron (VVS₁), 25 micron (VVS₂), larger when visible through other facets	2	2
						3	3
VVS₂ (very, very slightly included)	2		VVS₂				4
VS₁ (very slightly included)	3	VS	VS₁	VS (VS₁, VS₂) Very small inclusion(s), which can hardly be found with a 10x loupe	VS₁ - VS₂ Inclusions that are visible through table have average sizes of 40 micron (VS₁), 70 micron (VS₂); larger when visible through other facets	4	5
VS₂ (very slightly included)	4		VS₂			5	6
SI₁ (slightly included)	5	SI	SI₁	SI (SI₁, SI₂) Small inclusion(s), easy to find with a 10x loupe, not seen with the naked eye through the crown side	S1 Inclusions that are visible through table have average sizes of 150 micron		7
SI₂ (slightly included)	6		SI₂				7a
I₁ (imperfect)	7-8	P	P₁	PI (Pique I) Inclusion(s) immediately evident with a 10x loupe, difficult to find with the naked eye through the crown side, not impairing brilliance	P1 Inclusions which are visible through the crown-side have average sizes of 0.5 mm	6	9
I₂ (imperfect)	9		P₂	PII (Pique II) Large and/or numerous inclusion(s), easily visible to the naked eye through the crown side and which slightly reduce(s) brilliance	P2 Inclusions have average sizes of 1.5 mm; they slightly reduce brilliancy	7	10
I₃ (imperfect)	10		P₃	PIII (Pique III) Large and/or numerous inclusion(s), very easily visible to the naked eye through the crown side and which reduce(s) brilliance	P3 Inclusions have average sizes of 3 mm or larger; they reduce the brilliancy	8-9	11-12