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Grit - Micron Conversion

American  Standard (Grit)	Micron
100,000	1/4
60,000	1/2
14,000	1
13,000	1.5
9,000	2.5
8,000	3
5,000	4
4,500	5
2,800	7
1,800	9
1,400	14
1,200	15
1,050	18
800	25
600	30
500	35
325	45
285	55
240	70
225	90
160	110
100	150

Gemstone Properties    Faceting How-to

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