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Standard Gemstones Weight and Sizes Chart

Jun 05, 2024

Standard Gemstones Weight and Sizes Chart

Calibrated Size Charts for Gemstones to be set in Standard Jewelry Mountings

Oval Cut Calibrated Size Chart for Standard Jewelry Mountings (approximate weights)
Size in mm Weight in carat	5×3	6×4	7×5	8×6	9×7	10×8	11×9	12×10	14×12
Alexandrite	.30	.51	.80	1.45	2.00	3.60	4.25	6.00	8.90
Amethyst	.23	.45	.85	1.25	1.75	2.40	3.20	4.50	6.50
Aquamarine	.20	.40	.75	1.10	1.75	2.25	3.00	4.50	6.75
Citrine	.23	.45	.85	1.25	1.75	2.40	3.25	4.20	5.20
Diamond	.25	.50	.75	1.40	2.00	3.00	4.00	5.00	8.00
Emerald	.25	.52	.85	1.26	1.90	2.60	3.75	5.00	7.50
Pyrope Garnet	.25	.55	1.00	1.40	2.10	2.80	3.75	5.00	7.00
Iolite	.21	.40	.63	1.02	–	–	–	–	–
Opal	.16	.28	.47	.78	1.10	1.65	2.15	3.00	4.00
Peridot	.28	.50	.95	1.35	2.00	2.50	3.50	4.00	6.00
Ruby	.35	.60	1.06	1.55	2.20	3.15	3.80	6.00	7.25
Sapphire	.35	.60	1.00	1.55	2.20	3.15	3.80	6.00	7.25
Tanzanite	.20	.48	.89	1.35	–	–	–	–	–
Topaz	.28	.57	1.10	1.60	2.50	3.50	4.50	6.00	8.80
Tourmaline	.25	.50	.90	1.18	2.30	2.90	3.50	5.25	6.80
Tsavorite	.28	.52	.75	–	–	–	–	–	–
Zircon	.40	.75	1.45	2.00	2.85	4.00	5.60	7.50	8.20

Round Cut Calibrated Size Chart for Standard Jewelry Mountings (approximate weights)
Size in mm Weight in carat	2	3	4	5	6	6.5	7	8	10
Alexandrite	.04	.12	.35	.63	1.30	1.86	2.15	2.90	5.20
Amethyst	.04	.10	.20	.40	.70	1.10	1.30	1.80	3.30
Aquamarine	.04	.10	.25	.45	.75	1.31	1.60	2.40	3.50
Citrine	.04	.10	.20	.40	.70	1.10	1.30	1.80	3.30
Diamond	.03	.10	.23	.47	.80	1.00	1.25	1.90	3.50
Emerald	.04	.12	.27	.48	.80	1.26	1.70	2.50	6.10
Pyrope Garnet	.05	.13	.30	.60	1.00	1.40	1.60	2.50	5.75
Opal	.02	.09	.16	.34	.57	.75	.83	1.30	2.00
Peridot	.05	.12	.26	.50	.85	1.11	1.25	2.00	5.25
Ruby	.05	.15	.34	.65	1.05	1.41	1.60	2.25	4.50
Sapphire	.05	.15	.34	.65	1.05	1.41	1.60	2.25	4.50
Topaz	.04	.11	.30	.56	1.00	1.36	1.55	2.50	5.75
Tourmaline	.04	.12	.24	.45	.75	1.28	1.55	2.00	3.00
Zircon	.06	.17	.36	.69	1.25	1.58	1.75	2.60	5.00

Pear Cut Calibrated Size Chart for Standard Jewelry Mountings (approximate weights)
Size in mm Weight in carat	5×3	6×4	7×5	8×6	9×6	10×7	12×8	14×9
Alexandrite	.30	.50	.85	1.10	2.10	3.60	6.60	8.80
Amethyst	.20	.35	.65	.85	1.25	1.70	4.00	5.00
Aquamarine	.20	.35	.65	.90	1.30	1.85	4.20	5.60
Citrine	.20	.35	.65	.85	1.30	1.70	4.00	5.00
Diamond	.25	.50	.75	1.00	1.50	2.00	3.50	5.00
Emerald	.25	.45	.70	1.05	1.70	2.60	4.15	6.10
Pyrope Garnet	.25	.40	1.00	1.15	1.30	1.80	3.50	5.80
Opal	.13	.22	.35	.50	.70	1.03	1.40	2.45
Peridot	.25	.45	.70	.80	1.10	1.40	3.40	4.75
Ruby	.30	.50	.75	1.00	1.85	2.50	4.75	7.90
Sapphire	.30	.50	.75	1.00	1.85	2.50	4.75	7.90
Topaz	.25	.50	1.00	1.10	2.00	3.50	6.50	8.50
Tourmaline	.35	.45	.60	.90	1.10	1.40	2.80	6.75
Zircon	.30	.70	1.00	1.30	2.60	4.00	5.25	7.50

Octagon / Emerald Cut Calibrated Size Chart for Standard Jewelry Mountings (approximate weights)
Size in mm Weight in carat	5×3	6×4	7×5	8×6	9×7	10×8	11×9	12×10	14×12
Alexandrite	.40	.70	1.30	2.60	3.60	4.20	6.00	8.50	9.90
Amethyst	.35	.55	1.10	1.60	2.25	2.90	4.20	5.60	7.25
Aquamarine	.25	.50	.80	1.40	2.00	3.00	4.30	4.75	7.75
Citrine	.35	.55	1.00	1.60	2.25	2.90	4.20	5.60	7.25
Diamond	.25	.50	1.00	1.50	3.00	4.00	5.00	7.80	8.80
Emerald	.30	.60	.90	1.80	2.31	3.15	4.50	5.25	5.80
Pyrope Garnet	.40	.80	1.20	1.70	2.50	3.50	4.30	6.35	9.00
Peridot	.35	.60	1.00	1.70	2.25	3.80	5.25	6.25	8.80
Ruby	.55	.75	1.15	1.60	2.30	2.75	4.00	6.25	9.00
Sapphire	.55	.75	1.15	1.75	2.30	2.75	4.00	6.25	9.00
Topaz	.40	.65	1.25	2.40	3.40	4.00	5.75	8.00	9.50
Tourmaline	.30	.60	1.60	2.15	2.80	3.60	4.30	5.20	8.50
Zircon	.60	.85	1.70	2.35	3.90	450	6.20	7.01	8.95

Marquise Cut Calibrated Size Chart for Standard Jewelry Mountings (approximate weights)
Size in mm Weight in carat	4×2	5×3	6×3	7×3.5	8×4	10×5	12×6	14×7
Alexandrite	.07	.20	.30	.50	.70	1.25	2.10	3.50
Amethyst	.10	.15	.20	.34	.48	.90	1.59	2.45
Aquamarine	.08	.14	.20	.25	.50	.80	1.50	2.75
Citrine	.10	.15	.20	.35	.50	.90	1.59	2.45
Diamond	.12	.18	.25	.37	.50	1.00	2.00	3.00
Emerald	.09	.19	.30	.45	.60	1.40	1.80	2.80
Pyrope Garnet	.09	.16	.25	.42	.60	1.20	2.00	2.85
Opal	.09	.13	.17	.27	.37	.59	1.00	1.25
Peridot	.10	.17	.25	.37	.50	1.00	2.00	2.55
Ruby	.13	.24	.35	.55	.75	1.15	2.20	3.00
Sapphire	.13	.24	.35	.55	.75	1.15	2.20	3.00
Topaz	.07	.17	.30	.50	.70	1.20	2.00	3.40
Tourmaline	.10	.20	.30	.45	.60	.85	1.55	2.20
Zircon	.13	.23	.33	.55	.75	1.25	1.95	3.00

Gemstone (Colored Stones) Standard Size and Weight Chart

Conversion rate : 1 millimeter (mm) = 0.0393700787 inch (in)
1 inch (in) = 25.4 millimeters (mm)

	Oval Cut
	Oval Faceted Gemstone Weight Chart (approximate weights)
	5x3mm	6x4mm	7x5mm	8x6mm	9x7mm	10x8mm	11x9mm	12x10mm	14x10mm
Alexandrite	.30 ct	.51 ct	.80 ct	1.45 ct	2.00 ct	3.60 ct	4.25 ct	6.00 ct	8.90 ct
Amethyst	.23 ct	.45 ct	.85 ct	1.25 ct	1.75 ct	2.40 ct	3.20 ct	4.50 ct	6.50 ct
Aquamarine	.20 ct	.40 ct	.75 ct	1.10 ct	1.75 ct	2.25 ct	3.00 ct	4.50 ct	6.75 ct
Citrine	.23 ct	.45 ct	.85 ct	1.25 ct	1.75 ct	2.40 ct	3.25 ct	4.20 ct	5.20 ct
Emerald	.25 ct	.52 ct	.85 ct	1.26 ct	1.90 ct	2.60 ct	3.75 ct	5.00 ct	7.50 ct
Garnet	.25 ct	.55 ct	1.00 ct	1.40 ct	2.10 ct	2.80 ct	3.75 ct	5.00 ct	7.00 ct
Rhodolite	.25 ct	.55 ct	1.00 ct	1.40 ct	2.10 ct	2.80 ct	-	-	-
Iolite	.21 ct	.40 ct	.63 ct	1.02 ct	-	-	-	-	-
Opal	.16 ct	.28 ct	.47 ct	.78 ct	1.10 ct	1.65 ct	2.15 ct	3.00 ct	4.00 ct
Peridot	.28 ct	.50 ct	.95 ct	1.35 ct	2.00 ct	2.50 ct	3.50 ct	4.00 ct	6.00 ct
Ruby	.35 ct	.60 ct	1.06 ct	1.55 ct	2.20 ct	3.15 ct	3.80 ct	6.00 ct	7.25 ct
Sapphire	.35 ct	.60 ct	1.00 ct	1.55 ct	2.20 ct	3.15 ct	3.80 ct	6.00 ct	7.25 ct
Tanzanite	.20 ct	.48 ct	.89 ct	1.35 ct	-	-	-	-	-
Topaz	.28 ct	.57 ct	1.10 ct	1.60 ct	2.50 ct	3.50 ct	4.50 ct	6.00 ct	8.80 ct
Tourmaline	.25 ct	.50 ct	.90 ct	1.18 ct	2.30 ct	2.90 ct	3.50 ct	5.25 ct	6.80 ct
Tsavorite	.28 ct	.52 ct	.75 ct	-	-	-	-	-	-
Zircon	.40 ct	.75 ct	1.45 ct	2.00 ct	2.85 ct	4.00 ct	5.60 ct	7.50 ct	8.20 ct
	5x3mm	6x4mm	7x5mm	8x6mm	9x7mm	10x8mm	11x9mm	12x10mm	14x10mm

	Pear shape.
	Pear Faceted Gemstone Weight Chart (approximate weights)
	5x3mm	6x4mm	7x5mm	8x6mm	9x6mm	10x7mm	12x8mm	14x9mm
Alexandrite	.30 ct	.50 ct	.85 ct	1.10 ct	2.10 ct	3.60 ct	6.60 ct	8.80 ct
Amethyst	.20 ct	.35 ct	.65 ct	.85 ct	1.25 ct	1.70 ct	4.00 ct	5.00 ct
Aquamarine	.20 ct	.35 ct	.65 ct	.90 ct	1.30 ct	1.85 ct	4.20 ct	5.60 ct
Citrine	.20 ct	.35 ct	.65 ct	.85 ct	1.30 ct	1.70 ct	4.00 ct	5.00 ct
Emerald	.25 ct	.45 ct	.70 ct	1.05 ct	1.70 ct	2.60 ct	4.15 ct	6.10 ct
Garnet	.25 ct	.40 ct	1.00 ct	1.15 ct	1.30 ct	1.80 ct	3.50 ct	5.80 ct
Opal	.13 ct	.22 ct	.35 ct	.50 ct	.70 ct	1.03 ct	1.40 ct	2.45 ct
Peridot	.25 ct	.45 ct	.70 ct	.80 ct	1.10 ct	1.40 ct	3.40 ct	4.75 ct
Ruby	.30 ct	.50 ct	.75 ct	1.00 ct	1.85 ct	2.50 ct	4.75 ct	7.90 ct
Sapphire	.30 ct	.50 ct	.75 ct	1.00 ct	1.85 ct	2.50 ct	4.75 ct	7.90 ct
Topaz	.25 ct	.50 ct	1.00 ct	1.10 ct	2.00 ct	3.50 ct	6.50 ct	8.50 ct
Tourmaline	.35 ct	.45 ct	.60 ct	.90 ct	1.10 ct	1.40 ct	2.80 ct	6.75 ct
Zircon	.30 ct	.70 ct	1.00 ct	1.30 ct	2.60 ct	4.00 ct	5.25 ct	7.50 ct

	Round Cut Gemstones
	Round Faceted Gemstone Weight Chart (approximate weights)
	2mm	3mm	4mm	5mm	6mm	6.5mm	7mm	8mm	10mm
Alexandrite	.04 ct	.12 ct	.35 ct	.63 ct	1.30 ct	1.86 ct	2.15 ct	2.90 ct	5.20 ct
Amethyst	.04 ct	.10 ct	.20 ct	.40 ct	.70 ct	1.10 ct	1.30 ct	1.80 ct	3.30 ct
Aquamarine	.04 ct	.10 ct	.25 ct	.45 ct	.75 ct	1.31 ct	1.60 ct	2.40 ct	3.50 ct
Citrine	.04 ct	.10 ct	.20 ct	.40 ct	.70 ct	1.10 ct	1.30 ct	1.80 ct	3.30 ct
Emerald	.04 ct	.12 ct	.27 ct	.48 ct	.80 ct	1.26 ct	1.70 ct	2.50 ct	6.10 ct
Garnet	.05 ct	.13 ct	.30 ct	.60 ct	1.00 ct	1.40 ct	1.60 ct	2.50 ct	5.75 ct
Opal	.02 ct	.09 ct	.16 ct	.34 ct	.57 ct	.75 ct	.83 ct	1.30 ct	2.00 ct
Peridot	.05 ct	.12 ct	.26 ct	.50 ct	.85 ct	1.11 ct	1.25 ct	2.00 ct	5.25 ct
Ruby	.05 ct	.15 ct	.34 ct	.65 ct	1.05 ct	1.41 ct	1.60 ct	2.25 ct	4.50 ct
Sapphire	.05 ct	.15 ct	.34 ct	.65 ct	1.05 ct	1.41 ct	1.60 ct	2.25 ct	4.50 ct
Topaz	.04 ct	.11 ct	.30 ct	.56 ct	1.00 ct	1.36 ct	1.55 ct	2.50 ct	5.75 ct
Tourmaline	.04 ct	.12 ct	.24 ct	.45 ct	.75 ct	1.28 ct	1.55 ct	2.00 ct	3.00 ct
Zircon	.06 ct	.17 ct	.36 ct	.69 ct	1.25 ct	1.58 ct	1.75 ct	2.60 ct	5.00 ct

	Emerald Cut (octagon cut)
	Octagon Faceted Gemstone Weight Chart (approximate weights)
	5x3mm	6x4mm	7x5mm	8x6mm	9x7mm	10x8mm	11x9mm	12x10mm	14x10mm
Alexandrite	.40 ct	.70 ct	1.30 ct	2.60 ct	3.60 ct	4.20 ct	6.00 ct	8.50 ct	9.90 ct
Amethyst	.35 ct	.55 ct	1.00 ct	1.60 ct	2.25 ct	2.90 ct	4.20 ct	5.60 ct	7.25 ct
Aquamarine	.25 ct	.50 ct	.80 ct	1.40 ct	2.00 ct	3.00 ct	4.30 ct	4.75 ct	7.75 ct
Citrine	.35 ct	.55 ct	1.00 ct	1.60 ct	2.25 ct	2.90 ct	4.20 ct	5.60 ct	7.25 ct
Emerald	.30 ct	.60 ct	.90 ct	1.80 ct	2.31 ct	3.15 ct	4.50 ct	5.25 ct	5.80 ct
Garnet	.40 ct	.80 ct	1.20 ct	1.70 ct	2.50 ct	3.50 ct	4.30 ct	6.35 ct	9.00 ct
Peridot	.35 ct	.60 ct	1.00 ct	1.70 ct	2.25 ct	3.80 ct	5.25 ct	6.25 ct	8.80 ct
Ruby	.55 ct	.75 ct	1.15 ct	1.60 ct	2.30 ct	2.75 ct	4.00 ct	6.25 ct	9.00 ct
Sapphire	.55 ct	.75 ct	1.15 ct	1.75 ct	2.30 ct	2.75 ct	4.00 ct	6.25 ct	9.00 ct
Topaz	.40 ct	.65 ct	1.25 ct	2.40 ct	3.40 ct	4.00 ct	5.75 ct	8.00 ct	9.50 ct
Tourmaline	.30 ct	.60 ct	1.60 ct	2.15 ct	2.80 ct	3.60 ct	4.30 ct	5.20 ct	8.50 ct
Zircon	.60 ct	.85 ct	1.70 ct	2.35 ct	3.90 ct	4.50 ct	6.20 ct	7.01 ct	8.95 ct

	Marquise Cut
	Marquise Faceted Gemstone Weight Chart (approximate weights)
	4x2mm	5x3mm	6x3mm	7x3.5mm	8x4mm	10x5mm	12x6mm	14x7mm
Alexandrite	.07 ct	.20 ct	.30 ct	.50 ct	.70 ct	1.25 ct	2.10 ct	3.50 ct
Amethyst	.10 ct	.15 ct	.20 ct	.34 ct	.48 ct	.90 ct	1.59 ct	2.45 ct
Aquamarine	.08 ct	.14 ct	.20 ct	.25 ct	.50 ct	.80 ct	1.50 ct	2.75 ct
Citrine	.10 ct	.15 ct	.20 ct	.35 ct	.50 ct	.90 ct	1.59 ct	2.45 ct
Emerald	.09 ct	.19 ct	.30 ct	.45 ct	.60 ct	1.40 ct	1.80 ct	2.80 ct
Garnet	.09 ct	.16 ct	.25 ct	.42 ct	.60 ct	1.20 ct	2.00 ct	2.85 ct
Opal	.09 ct	.13 ct	.17 ct	.27 ct	.37 ct	.59 ct	1.00 ct	1.25 ct
Peridot	.10 ct	.17 ct	.25 ct	.37 ct	.50 ct	1.00 ct	2.00 ct	2.55 ct
Ruby	.13 ct	.24 ct	.35 ct	.55 ct	.75 ct	1.15 ct	2.20 ct	3.00 ct
Sapphire	.13 ct	.24 ct	.35 ct	.55 ct	.75 ct	1.15 ct	2.20 ct	3.00 ct
Topaz	.07 ct	.17 ct	.30 ct	.50 ct	.70 ct	1.20 ct	2.00 ct	3.40 ct
Tourmaline	.10 ct	.20 ct	.30 ct	.45 ct	.60 ct	.85 ct	1.55 ct	2.20 ct
Zircon	.13 ct	.23 ct	.33 ct	.55 ct	.75 ct	1.25 ct	1.95 ct	3.00 ct

Standard Gem Sizes Chart Image

Printable Actual Size Gem Size Chart

Rounds		Squares		Ovals
Size	Weight	Size	Weight	Size	Weight
1.6 mm	.02 carat	5 mm	.75 carat	5 x 3 mm	.25 carat
2 mm	.03 carat	6 mm	1.3 carat	6 x 4 mm	.5 carat
2.5 mm	.06 carat	7 mm	2.05 carat	7 x 5 mm	1.0 carat
3 mm	.10 carat	8 mm	2.9 carat	8 x 6 mm	1.5 carat
3.5 mm	.16 carat	9 mm	4.4 carat	9 x 7 mm	2.5 carat
4 mm	.25 carat	10 mm	6.0 carat	10 x 8 mm	3.0 carat
4.5 mm	.33 carat	11 mm	8.0 carat	11 x 9 mm	4.0 carat
5 mm	.50 carat	12 mm	10.35 carat	12 x 10 mm	5.0 carat
5.5 mm	.65 carat	13 mm	13.2 carat	14 x 10 mm	6.0 carat
6 mm	.75 carat	14 mm	16.5 carat	14 x 12 mm	8.0 carat
6.5 mm	1.0 carat	15 mm	20.25 carat	16 x 12 mm	10.5 carat
7 mm	1.25 carat	16 mm	24.6 carat	18 x 13 mm	14.2 carat
8 mm	2.0 carat	20 x 15 mm	20.3 carat
9 mm	2.75 carat	22 x 15 mm	23.5 carat
10 mm	3.5 carat	23 x 17 mm	32.2 carat
11 mm	4.6 carat	25 x 18 mm	43.0 carat
12 mm	6.0 carat	27 x 20 mm	58.5 carat
13 mm	7.75 carat	30 x 22 mm	79.6 carat
14 mm	9.65 carat
15 mm	11.85 carat
16 mm	14.35 carat
17 mm	17.25 carat
18 mm	20.5 carat
19 mm	24.0 carat
20 mm	28.0 carat
21 mm	34.8 carat
22 mm	41.8 carat
23 mm	49.8 carat
24 mm	57.9 carat
25 mm	68.7 carat

Emerald		Pear		Marquis
6 x 4 mm	.5 carat	6 x 5 mm	.7 carat	4 x 2 mm	.10 carat
7 x 5 mm	1.0 carat	7 x 5 mm	.75 carat	5 x 2.5 mm	.25 carat
8 x 6 mm	1.5 carat	8 x 5 mm	1.0 carat	6 x 3 mm	.30 carat
9 x 7 mm	2.5 carat	9 x 6 mm	1.5 carat	8 x 4 mm	.75 carat
10 x 8 mm	3.0 carat	10 x 7 mm	2.0 carat	10 x 5 mm	1.0 carat
11 x 9 mm	4.0 carat	11 x 7 mm	2.25 carat	12 x 6 mm	2.0 carat
12 x 10 mm	5.0 carat	12 x 8 mm	3.0 carat	14 x 7 mm	3.0 carat
14 x 10 mm	6.0 carat	13 x 9 mm	3.5 carat	16 x 8 mm	4.0 carat
14 x 12 mm	8.0 carat	15 x 10 mm	5.5 carat	18 x 9 mm	6.0 carat
16 x 12 mm	10.5 carat	16 x 12 mm	8.6 carat	20 x 10 mm	8.5 carat
18 x 13 mm	14.2 carat	18 x 13 mm	12 carat
20 x 15 mm	20.3 carat	20 x 15 mm	17.3 carat
25 x 18 mm	52.2 carat	22 x 15 mm	18.7 carat
25 x 18 mm	30.6 carat
30 x 22 mm	54.5 carat

Calibrated Standard Stone Size Charts for Gemstones to be set in Standard Jewelry Mountings Chart

Estimating Weights for Standard Faceted Cut Diamond

Rounds		Squares / Princess		Ovals
Size	Weight	Size	Weight	Size	Weight
1.6 mm	.02 carat	2 mm	.05 carat	5 x 3 mm	.25 carat
2 mm	.03 carat	2.5 mm	.09 carat	6 x 4 mm	.5 carat
2.5 mm	.06 carat	3 mm	.16 carat	7 x 5 mm	.75 carat
3 mm	.10 carat	3.5 mm	.25 carat	8 x 6 mm	1.0 carat
3.5 mm	.16 carat	4 mm	.33 carat	9 x 7 mm	1.5 carat
4 mm	.25 carat	4.5 mm	.50 carat	10 x 8 mm	2.16 carat
4.5 mm	.33 carat	5 mm	.75 carat	11 x 9 mm	3.5 carat
5 mm	.50 carat	5.5 mm	1.0 carat	12 x 10 mm	4.25 carat
5.5 mm	.62 carat	6 mm	1.25 carat	14 x 10 mm	6.0 carat
6 mm	.75 carat	6.5 mm	1.5 carat	14 x 12 mm	8.0 carat
6.5 mm	1.0 carat	7 mm	2.0 carat	16 x 12 mm	9.33 carat
7 mm	1.25 carat	7.5 mm	2.5 carat	18 x 13 mm	14.2 carat
7.5 mm	1.62 carat	8 mm	3.0 carat
8 mm	2.0 carat	8.5 mm	3.75 carat
8.5 mm	2.33 carat	9 mm	4.0 carat
9 mm	2.9 carat	9.5 mm	5.0 carat
9.5mm	3.25 carat	10 mm	5.5 carat
10 mm	3.75 carat	10.5 mm	6.0 carat
10.5 mm	4.5 carat	11 mm	7.5 carat
11 mm	5.0 carat	12 mm	9.5 carat
11.5 mm	5.375 carat	13 mm	13.2 carat
12 mm	6.125 carat	14 mm	16.5 carat
13 mm	7.75 carat	15 mm	20.25 carat
14 mm	9.75 carat	16 mm	24.6 carat
15 mm	11.85 carat
16 mm	16 carat
17 mm	17.25 carat
8 mm	20.5 carat
19 mm	24.0 carat
20 mm	28.0 carat
21 mm	34.8 carat
22 mm	41.8 carat

Emerald		Pear		Marquise
Size	Weight	Size	Weight	Size	Weight
5 x 3 mm	.33 carat	3 x 2 mm	.05 carat	4 x 2 mm	.08 carat
6 x 4 mm	.625 carat	4 x 3 mm	.14 carat	5 x 2.5 mm	.15 carat
7 x 5 mm	1.25 carat	5 x 3 mm	.2 carat	5 x 3 mm	.20 carat
8 x 6 mm	1.75 carat	6 x 4 mm	.33 carat	6 x 3 mm	.25 carat
9 x 7 mm	2.5 carat	7 x 5 mm	.5 carat	8 x 4 mm	.50 carat
10 x 8 mm	3.75 carat	8 x 5 mm	.9 carat	9 x 5 mm	.75 carat
11 x 9 mm	4.75 carat	9 x 6 mm	1.5 carat	10 x 5 mm	.9 carat
12 x 10 mm	5.0 carat	10 x 7 mm	1.75 carat	11 X 5.5 mm	1.12 carat
14 x 10 mm	8.5 carat	11 x 7 mm	2 carat	12 x 6 mm	2.0 carat
14 x 12 mm	9.0 carat	12 x 8 mm	3.0 carat	14 x 7 mm	3.0 carat
16 x 12 mm	10.5 carat	13 x 9 mm	3.5 carat	16 x 8 mm	4.0 carat
18 x 13 mm	14.2 carat	15 x 10 mm	5 carat	18 x 9 mm	6.0 carat
20 x 15 mm	20.3 carat	16 x 12 mm	8.6 carat	20 x 10 mm	8.5 carat
25 x 18 mm	52.2 carat	18 x 12 mm	9.3 carat
25 x 18 mm	30.6 carat	20 x 15 mm	18 carat
30 x 22 mm	54.5 carat	22 x 16 mm	23 carat
		23 x 17 mm	25 carat
		25 x 18mm	27 carat
		27 x 20mm	30 carat
		30 x 22mm	34 carat

Cushion		Heart		Asscher
Size	Weight	Size	Weight	Size	Weight
4 x 4 mm	.375 carat	4 x 4 mm	.25 carat	3 x 3 mm	.16 carat
4.5 x 4.5 mm	.5 carat	5 x 5 mm	.5 carat	3.5 x 3.5 mm	.25 carat
5 x 5 mm	.625 carat	6 x 6 mm	.75 carat	4 x 4 mm	.33 carat
5.5 x 5.5 mm	.75 carat	6.5 x& 6..5 mm	1.0 carat	4.5 x 4.5 mm	.5 carat
6 x 6 mm	1.25 carat	7 x 7 mm	1.5 carat	5 x 5 mm	.75 carat
6.5 x 6..5 mm	1.5 carat	8 x 8 mm	2.0 carat	5.5 x 5.5 mm	1.0 carat
7 x 7 mm	2.0 carat	9 x 9 mm	3.0 carat	5.9 x 5.9 mm	1.33 carat
8 x 6 mm	2.0 carat	10 x 10 mm	4.0 carat	6 x 6 mm	1.25 carat
8 x 8 mm	2.9 carat	11 x 11 mm	5.0 carat	6.25 x 6.25 mm	1.37 carat
9 x 7 mm	2.5 carat	12 x 12 mm	5.66 carat	6.5 x 6.5mm	1.5 carat
10 x 8 mm	4.0 carat	15 x 15 mm	10.75 carat	6.6 x 6.6 mm	1.75 carat
12 x 10 mm	7.5 carat	16 x 16 mm	13.25 carat	7 x 7 mm	2.0 carat
14 x 10 mm	9.5 carat	18 x 18 mm	15.33 carat	8 x 8 mm	3.0 carat

Trillion
Size	Weight	Size	Weight
2 x 2 x 2 mm	0.04 carat
3 x 3 x 3mm	0.06 carat
3.5 x 3.5 x 3.5mm	0.125 carat
4 x 4 x 4mm	0.1666 carat
4.5 x 4.5 x 4.5mm	0.2 carat
5 x 5 x 5mm	0.333 carat
5.5 x 5.5 x 5.5mm	0.375 carat
6 x 6 x 6mm	0.5 carat

Faceted Gemstone Weight and Size Charts

Round (rd)

Size / mm

1.5

2.5

3.5

4.5

5.5

6.5

7.5

Amethyst - CT

0.01

0.02

0.04

0.07

0.1

0.14

0.2

0.28

0.4

0.52

0.7

0.91

1.3

1.5

1.8

3.3

Aquamarine - CT

0.01

0.02

0.04

0.06

0.1

0.16

0.25

0.33

0.45

0.57

0.75

1.09

1.6

1.92

2.2

3.5

Citrine - CT

0.01

0.02

0.04

0.07

0.1

0.14

0.2

0.28

0.4

0.52

0.7

0.91

1.3

1.5

1.8

3.3

Cubic Zirconia - CT

0.01

0.03

0.05

0.09

0.18

0.28

0.45

0.63

0.9

1.08

1.44

1.8

2.25

2.7

3.6

7.2

Diamond - CT

0.01

0.02

0.03

0.05

0.1

0.16

0.25

0.35

0.5

0.6

0.8

1.25

1.5

Emerald - CT

0.01

0.02

0.04

0.08

0.12

0.2

0.27

0.38

0.48

0.65

0.8

1.16

1.55

1.85

2.2

4.25

Garnet - CT

0.01

0.03

0.05

0.08

0.13

0.2

0.3

0.42

0.6

0.76

1.24

1.6

1.96

2.5

5.75

Opal - CT

0.01

0.02

0.05

0.09

0.12

0.16

0.23

0.34

0.43

0.57

0.67

0.83

1.02

1.3

Peridot - CT

0.01

0.02

0.05

0.77

0.12

0.18

0.26

0.36

0.5

0.62

0.85

1.01

1.25

1.55

5.25

Ruby - CT

0.01

0.03

0.05

0.09

0.15

0.24

0.34

0.45

0.6

0.82

1.05

1.3

1.7

2.3

4.75

Sapphire - CT

0.01

0.03

0.05

0.09

0.15

0.24

0.34

0.45

0.6

0.82

1.05

1.3

1.7

2.3

4.75

Topaz - CT

0.01

0.02

0.04

0.07

0.11

0.19

0.3

0.41

0.56

0.73

1.22

1.55

1.93

2.5

5.75

Tourmaline - CT

0.01

0.02

0.04

0.08

0.12

0.17

0.24

0.32

0.45

0.57

0.75

1.01

1.25

1.55

3.2

Oval (ov)

Size / mm

5x3

6x4

7x5

8x6

9x7

10x8

11x9

12x10

Amethyst - CT

0.23

0.45

0.85

1.25

1.75

2.4

3.2

4.5

Aquamarine - CT

0.2

0.4

0.75

1.1

1.75

2.25

4.5

Citrine - CT

0.23

0.45

0.85

1.25

1.75

2.4

3.2

4.5

Cubic Zirconia - CT

0.45

0.9

1.26

2.35

3.6

5.4

7.2

Diamond - CT

0.25

0.5

0.75

1.4

Emerald - CT

0.28

0.52

0.85

1.6

2.25

3.75

Garnet - CT

0.25

0.55

1.4

2.1

2.8

3.75

Opal - CT

0.16

0.28

0.47

0.78

1.1

1.65

2.15

Peridot - CT

0.28

0.5

0.95

1.35

2.25

3.5

Ruby - CT

0.35

0.6

1.55

2.2

3.15

3.8

Sapphire - CT

0.35

0.6

1.55

2.2

3.15

3.8

Topaz - CT

0.27

0.57

1.1

1.6

2.5

3.5

4.5

Tourmaline - CT

0.25

0.5

0.9

1.18

2.3

2.9

3.5

5.25

Emerald Cut (ec)

Size / mm

5x3

6x4

7x5

8x6

9x7

10x8

11x9

12x10

Amethyst - CT

0.35

0.55

1.6

2.25

2.9

4.2

5.6

Aquamarine - CT

0.25

0.5

0.8

1.4

4.3

4.75

Citrine - CT

0.35

0.55

1.6

2.25

2.9

4.2

5.6

Cubic Zirconia - CT

0.45

0.9

1.8

2.7

4.5

5.85

12.6

Diamond - CT

0.25

0.5

1.5

2.5

3.25

Emerald - CT

0.3

0.6

0.9

1.8

2.31

3.15

4.5

5.25

Garnet - CT

0.4

0.8

1.2

1.7

2.5

3.5

4.3

6.35

Peridot - CT

0.35

0.6

1.7

2.25

3.8

5.25

6.25

Ruby - CT

0.55

0.7

1.15

1.7

2.3

3.4

6.25

Sapphire - CT

0.55

0.7

1.15

1.7

2.3

3.4

6.25

Topaz - CT

0.4

0.65

1.25

2.4

3.4

5.75

Tourmaline - CT

0.3

0.6

1.6

2.15

2.8

3.6

4.3

5.2

Pear Shape (ps)

Size / mm

5x3

6x4

7x5

8x5

9x6

10x7

Amethyst - CT

0.2

0.35

0.65

0.85

1.2

1.7

Aquamarine - CT

0.2

0.35

0.65

0.9

1.3

1.85

Citrine - CT

0.2

0.35

0.65

0.85

1.2

1.7

Cubic Zirconia - CT

0.45

0.9

1.26

1.53

1.89

3.6

Diamond - CT

0.25

0.5

0.7

0.85

1.05

Emerald - CT

0.25

0.45

0.7

1.05

1.7

2.6

Garnet - CT

0.25

0.4

1.15

1.3

1.8

Opal - CT

0.13

0.22

0.35

0.5

0.7

1.03

Peridot - CT

0.25

0.45

0.7

0.8

1.1

1.4

Ruby - CT

0.3

0.5

0.85

1.05

1.85

2.5

Sapphire - CT

0.3

0.5

0.85

1.05

1.85

2.5

Topaz - CT

0.25

0.5

1.1

1.4

Tourmaline - CT

0.35

0.45

0.6

0.9

1.1

1.4

Marquise (mq)

Size / mm

4x2

6x3

8x4

10x5

12x6

Amethyst - CT

0.1

0.2

0.48

0.9

1.59

Aquamarine - CT

0.08

0.2

0.5

0.8

1.5

Citrine - CT

0.1

0.2

0.48

0.9

1.59

Cubic Zirconia - CT

0.18

0.45

0.9

1.8

2.7

Diamond - CT

0.1

0.25

0.5

1.5

Emerald - CT

0.09

0.3

0.6

1.1

1.8

Garnet - CT

0.09

0.25

0.6

1.2

Opal - CT

0.09

0.17

0.37

0.59

Peridot - CT

0.1

0.25

0.5

Ruby - CT

0.13

0.35

0.75

1.15

2.2

Sapphire - CT

0.13

0.35

0.75

1.15

2.2

Topaz - CT

0.07

0.3

0.7

1.2

Tourmaline - CT

0.1

0.3

0.6

0.85

1.55

Square (sq)

Size / mm

1.5

2.5

3.5

4.5

Amethyst - CT

...

0.1

0.15

0.23

0.3

0.4

Aquamarine - CT

...

0.11

0.18

0.25

0.34

0.45

Citrine - CT

...

0.1

0.15

0.23

0.3

0.4

Cubic Zirconia - CT

0.02

0.05

0.09

0.15

0.22

0.32

0.39

0.5

Diamond - CT

0.02

0.05

0.09

0.15

0.22

0.32

0.39

0.5

Emerald - CT

0.03

0.07

0.11

0.18

0.25

0.35

0.41

0.5

Garnet - CT

...

0.15

0.27

0.4

0.54

0.75

Peridot - CT

...

0.14

0.22

0.34

0.46

0.65

Ruby - CT

0.04

0.07

0.13

0.2

0.3

0.4

0.47

0.55

Sapphire - CT

0.04

0.07

0.13

0.2

0.3

0.4

0.47

0.55

Topaz - CT

...

0.12

0.24

0.35

0.51

0.7

Tourmaline - CT

...

0.13

0.2

0.33

0.41

0.55

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Standard Gemstones Weight and Sizes Chart

Oval Cut

Pear Cut

Octagon / Emerald Cut

Marquise Cut

Gemstone (Colored Stones) Standard Size and Weight Chart

Conversion rate : 1 millimeter (mm) = 0.0393700787 inch (in) 1 inch (in) = 25.4 millimeters (mm)

Oval Cut

Pear shape.

Round Cut Gemstones

Emerald Cut (octagon cut)

Marquise Cut

Standard Gem Sizes Chart Image

Printable Actual Size Gem Size Chart

Calibrated Standard Stone Size Charts for Gemstones to be set in Standard Jewelry Mountings Chart

Faceted Gemstone Weight and Size Charts

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Subscribe to our newsletter for regular updates about Offers, Coupons & more

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Conversion rate : 1 millimeter (mm) = 0.0393700787 inch (in)
1 inch (in) = 25.4 millimeters (mm)