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

Shipping

Payment

Help

Gemstone Information

Customers Say it Best!

"I just wanted to let you know that I really appreciated that you combined the two orders.It was very thoughtful of you to do and refund me the additional $20, as when I placed the first order, I didn't have plans for another order so soon. I have been placing gemstone orders from your company for the last couple of years and have been very happy with the stones. Your company's service has always been top notch and it is a pleasure to do business with such an outstanding company."
--LH, UNITED STATES (March 2012)
"I appreciate the how GemSelect does business, and will continue to recommend it to other jewelry makers. The matched spinels from my last order were extremely good, and the violet sapphire from this most recent is very nice. The service is also very prompt and professional. Thank you very much."
--LD, UNITED STATES (October 2011)
"Thanks so much for the swift delivery I am happy with the 1.43 ct opal and will have it set as a pair of earrings soon. Thanks! "
--GTS, PHILIPPINES (September 2010)
"Dear GemSelect, I have been researching gem sales sites and yours is by far and away the best site I've encountered for ease of use, clarity, flexibility and logicality - it's a fantastic website. At present I'm saving my pennies with a view to being in touch soon to order some items. The degree of flexibility of the site is truly very impressive. However, the only thing that I've found I wanted to do that didn't seem possible was to set up a search for only translucent or opaque gems. I imagine that's possibly not something that a lot of users might be interested in doing, but for my purposes it would have been useful. "
--GS, Australia (December 2010)

Click here for more Testimonials

Email to a Friend
Recipient's E-Mail:
Recipient's Name:
Sender's Name:
Short Message:

Subscribe to our Newsletter
Your E-Mail address:
Confirm E-Mail address:
First Name:
Last Name: