Gemologica's Jewelry Learning Center, Information About Stone Size and Carat Weight

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Home » Learning Center » Stone Sizes

Gemologica Learning Center

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  · MM to Inches
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STONE SIZE

The following table shows common stone sizes, in addition to their corresponding total carat weight (i.e. CTW). Please note that the weights and sizes shown are approximate and should therefore only be used a rough guide.




		Round		CTW		.50		.75		1.00		1.25		1.50		2.00		2.50		3.00
		Round		MM		5.0		6.0		6.5		7.0		7.5		8.0		9.0		9.5

		Marquise		CTW		.50		.75		1.00		1.25		1.50		2.00		2.50		3.00
		Marquise		MM		7 X 4		8 X 4		10 X 5		10.5 X 5.5		11 X 5.5		12 X 6		13 X 6.5		14 X 7

		Pear		CTW		.50		.75		1.00		1.25		1.50		2.00		2.50		3.00
		Pear		MM		7 X 4		8 X 5		9 X 5		9.5 X 5.5		10 X 6		11 X 6.5		12 X 7		13 X 8

		Oval		CTW		.50		.75		1.00		1.25		1.50		2.00		2.50		3.00
		Oval		MM		6 X 4		6.5 X 5		7.5 X 5.5		8 X 6		8.5 X 6.5		9 X 7		9 X 7.5		10 X 8

		Emerald		CTW		.50		.75		1.00		1.25		1.50		2.00		2.50		3.00
		Emerald		MM		6 X 4		7 X 4.5		7 X 5		8 X 5		8.5 X 5.5		9 X 5.5		9.5 X 6		10.5 X 6

		Round		CTW		.01		.015		.04		.055		.11		.18		.25		.35
		Round		MM		1.3		1.5		2.0		2.5		3.0		3.5		4.0		4.5

		Baguette		CTW		.035		.05		.06		.075		.11		.15		.20		.25
		Baguette		MM		2.0		2.5		3.0		3.5		4.0		4.5		5.0		5.5

		Trillion		CTW		.10		.12		.15		.25		.30		.40		.50		1.0
		Trillion		MM		3.0		3.5		4.0		4.5		5.0		5.5		7.0		9.0

		Princess		CTW		.05		.10		.15		.25		.30		.45		.60		1.00
		Princess		MM		2.0		2.5		3.0		3.3		3.5		4.0		5.0		6.0

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