Rhinestone sizing is actually based on very old pearl sizing techniques, rather than the more 'modern-day' English, American, or Metric measurements.

The chart below is our attempt to make sense of these sizes, and show you how they convert to fractions of an inch and to millimeters.

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Rhinestone Size Conversion Chart Although the images and sizes in this chart are very close to actual size, they are still Approximate Only! We do NOT guarantee sizing based on this chart.
Rhinestone Size		Inches	Millimeters
		1/16	1.6
	5ss - (1.7 to 1.9mm)		1.8
	6ss - (1.9 to 2.1mm)	5/64	2.0
	7ss - (2.1 to 2.3mm)		2.2
	8ss - (2.3 to 2.5mm)	3/32	2.4
	9ss - (2.5 to 2.7mm)		2.6
	10ss - (2.7 to 2.9mm)	7/64	2.8
	3mm		3.0
	12ss - (3.0 to 3.2mm)		3.1
		1/8	3.2
	14ss - (3.4 to 3.6mm)		3.5
		9/64	3.6
	16ss - (3.8 to 4.0mm)		3.9
	4mm	5/32	4.0
	18ss - (4.2 to 4.4mm)		4.3
		11/64	4.4
	19ss - (4.4 to 4.6mm)		4.5
	20ss - (4.6 to 4.8mm)		4.7
		3/16	4.8
	5mm		5.0
		13/64	5.2
	24ss - (5.3 to 5.5mm)		5.4
		7/32	5.6
	6mm	15/64	6.0
	29ss - (6.1 to 6.3mm)		6.2
	30ss - (6.3 to 6.5mm)	1/4	6.4
		17/64	6.7
	7mm		7.0
		9/32	7.1
	34ss - (7.1 to 7.3mm)		7.2
		19/64	7.5
		5/16	7.9
	8mm		8.0
		21/64	8.3
	40ss - (8.4 to 8.7mm)		8.5
		11/32	8.7
		23/64	9.1
		3/8	9.5
		25/64	9.9
	10mm		10.0
		13/32	10.3
		27/64	10.7
			11.0
	48ss - (10.9 to 11.3mm)	7/16	11.1
		29/64	11.5
		15/32	11.9
	12mm		12.0
		31/64	12.3
		1/2	12.7
		33/64	13.1
		17/32	13.5
		9/16	14.3
		37/64	14.7
		19/32	15.1
		5/8	15.9
	16mm		16.0
		41/64	16.3
		21/32	16.7
		43/64	17.1
		11/16	17.5
		45/64	17.9
	18mm		18.0
		23/32	18.3
		47/64	18.7
		3/4	19.1
Rhinestone Size		Inches	Millimeters