Calibrated Size » Calibrated Size Comparison 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	5x3	6x4	7x5	8x6	9x7	10x8	11x9	12x10	14x12
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	5x3	6x4	7x5	8x6	9x6	10x7	12x8	14x9
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	5x3	6x4	7x5	8x6	9x7	10x8	11x9	12x10	14x12
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	4x2	5x3	6x3	7x3.5	8x4	10x5	12x6	14x7
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

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