Buy 12 mm Round Calibrated Gemstones from GemSelect

Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Round shapes, facet cut and cabochon gems available now in 12 mm diameter size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often around 0.3 mm or slightly higher even. This small variance can usually be accommodated for standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

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Overall Rating -> 10

I bought a small ring green so I may practice my jewelry making.

Posted By HairyOtter in July, 2023

Source: Bizrate

Overall Rating -> 8

Found on a search engine. Scanned inventory and made a small purchase.

Posted By Ralli in August, 2023

Source: Bizrate

Overall Rating -> 10

I have used Gem Select many times over the past 10 years and have always been happy with the product & services

Posted By Ordain in August, 2023

Source: Bizrate

Overall Rating -> 10

Found the stone I wanted which was delivered quickly and met expectations.

Posted By GemGrammy in January, 2024

Source: Bizrate

Overall Rating -> 10

Great site

Posted By Lord of Bananas in November, 2023

Source: Bizrate

Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

Source: Bizrate

Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

Posted By Fl_Beachcomber in October, 2023

Source: Bizrate

Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

Posted By Oakcityceo in May, 2023

Source: Bizrate

Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024

Source: Bizrate

Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

Source: Bizrate

Overall Rating -> 8

Very easy to find the specific stone I was looking for. I am pleased by both the selection and the price of the stones that are available. The only "bad" thing that I have to say is that the interface of the site is outdated.

Posted By Nick in March, 2024

Source: Bizrate

Overall Rating -> 10

The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

Posted By JAB93 in June, 2023

Source: Bizrate

Overall Rating -> 10

I have received emails for about a year and today is the condition that had me decide on the purchase

Posted By Tim in April, 2024

Source: Bizrate

Overall Rating -> 10

Everthing about researching and ordering from Gemselect was easy and uncomplicated. In the past I had payment problems, but your customer rep, Thomas, helped me get everything right. I will continue using Gemselet in the future for these reasons.

Posted By WildwillyfromArizona in August, 2023

Source: Bizrate

Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 12 mm Gems

2.51 ct Round Cut Peridot, 4.5 mm From China

2.13 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 7.2 x 5 mm

9.62 ct Marquise Rainbow Moonstone, 22.6 x 10.1 mm From the United States

0.34 ct Loose White Sapphire, 4.1 mm Diamond Cut From Madagascar

3.84 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 8.1 x 6.1 mm

0.48 ct Octagon Cut Kornerupine, 6.2 x 3.3 mm From Sri Lanka

0.96 ct Blue Kyanite, 6.9 x 5 mm Oval Cut From Nepal

14.59 ct Yellow Quartz, 20.2 x 15.2 mm Cushion Checkerboard From Brazil

1.14 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 22.6 x 2.5 mm

12.48 ct Orange Moonstone, 14.1 mm Round Cut From India

2.43 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 8 x 6.1 mm

5.12 ct Oval Cat's Eye Scapolite, 10 x 9.2 mm From Madagascar

14.99 carat Oval Fluorite, loose Certified Fluorite from India, Natural Untreated Gem, 18.4 x 14.1 mm

2.89 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10 x 7.9 mm

2.14 carat Orange Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 7 mm

1.78 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gem, 7 mm

0.87 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 10.6 x 4.9 mm

5.96 carat Square Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 4.9 x 4.8 mm

0.53 carat Green Sapphire, Cushion loose Sapphire from Tanzania, Natural Gem, 4.3 x 4.3 mm

1.21 ct Blue Kyanite, 7.1 x 5.1 mm Oval Cut From Nepal

2.89 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 9.9 mm

3.03 ct Yellow Sillimanite, 7 x 5 mm Oval Cut From Sri Lanka

7.07 ct Fancy Fire Agate, 13.6 x 10.2 mm From Mexico

6.32 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.9 x 11.7 mm

0.84 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 6 x 4.1 mm

5.27 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 13.9 x 9.9 mm

5.05 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 9.8 mm

0.91 carat Cushion Checkerboard Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 7.1 x 5.1 mm

40.24 ct Cushion Jasper, 27.6 x 26.4 mm From Indonesia

5.66 ct Oval Actinolite Cat's Eye, 13 x 10.1 mm From the United States

14.22 ct Black Spinel, 12.1 x 11.8 mm Heart Rose Cut From Thailand

2.48 ct Red Sunstone, 10 x 8.3 mm Oval Cut From India

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