Buy 13 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 13 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

Great experience! First time buyer

Posted By Todi89 in February, 2024

Source: Bizrate

Overall Rating -> 10

was just windowshopping and spotted a couple "Very Uncommons", a tsavorite & a demantoid garnet that were both in a size I was looking for, & that I could very easily pay for -- so figured I would grab the tsavo ASAP and got the demantoid to accompany so they wouldn't be lonely.

Posted By Kittypie070 in April, 2024

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

Love Gem select. great gems for the price. Can't beet them

Posted By Apps in September, 2023

Source: Bizrate

Overall Rating -> 10

GemSelect has the Best gems. Clear photos and detailed description helps me make the best choice. I have Never been disappointed by thier quality items.

Posted By Rock Hound in July, 2023

Source: Bizrate

Overall Rating -> 10

I FOUND WHAT I WANT IT

Posted By GABY in March, 2024

Source: Bizrate

Overall Rating -> 10

I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

Posted By Sue in April, 2023

Source: Bizrate

Overall Rating -> 10

I find the website user friendly.

Posted By Becky in August, 2023

Source: Bizrate

Overall Rating -> 9

Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

Posted By Bob in November, 2023

Source: Bizrate

Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

Source: Bizrate

Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

Source: Bizrate

Overall Rating -> 10

Hello: You do have good website. Vast majority of folks would buy the Gems for its spiritual, physical / energy level, emotional level positive aspects. You have only very brief mention of this aspect of each Gem ..may be you can add little bit more about ways to leverage the beneificial effect of each gems i.e. some practical tips.ThanksRupen Patel

Posted By EarthDeep in February, 2024

Source: Bizrate

Overall Rating -> 9

It was simple and clear to understand.

Posted By Thora007 in December, 2023

Source: Bizrate

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 -> 10

all good

Posted By John in December, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 13 mm Gems

1.05 ct Yellow Beryl, 7.9 x 7.6 mm Trillion Cut From Madagascar

2.23 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 7.1 x 5 mm

0.58 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.1 x 3.9 mm

9.72 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 21.1 x 6.9 mm

6.77 ct Diamond Cut Smoky Quartz, 12.5 mm From Brazil

1.27 ct Oval Sillimanite Cat's Eye, 7.4 x 4.7 mm From Madagascar

2.79 ct Loose Princess Cut Sapphire, 2.7 x 2.7 mm From Tanzania

12.6 ct Green Amazonite, 10.3 x 10.2 mm Cushion Cut From Madagascar

0.85 ct Loose Pink Sapphire, 6.1 x 4.1 mm Oval Cut From Tanzania

3.72 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 5.9 x 4.3 mm

10.41 ct Oval Cut Strawberry Quartz, 17.5 x 13.3 mm From Russia

2.83 ct Princess Cut Peridot, 5.1 x 5 mm From China

5.97 ct Orange Sunstone, 13.8 x 10 mm Oval Cut From India

3.03 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.8 mm

17.05 ct Loose Oval Bloodstone, 20.7 x 14.2 mm From Madagascar

0.58 ct Blue Kyanite, 3.8 mm Round Cut From Nepal

0.42 ct Loose Yellow Sapphire, 4.5 mm Round Cut From Tanzania

7.08 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.2 x 4.1 mm

18.82 ct Oval Rose Quartz, 18 x 15.8 mm From South Africa

3.27 ct Blue Star Sapphire, 6.8 x 5 mm Oval Cut From Thailand

11.89 ct Druzy Variscite, 29.4 x 21 mm From Argentina

4.31 carat Pink Morganite, Pear loose Morganite from Afghanistan, Natural Untreated Gem, 14 x 9.1 mm

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

0.71 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 6.8 x 4.9 mm

0.53 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from the United States, Natural Untreated Gem, 5 x 5 mm

0.83 ct Loose Orange Sapphire, 6 x 4.1 mm Oval Cut From Tanzania

2.67 ct Loose Orange Sapphire, 4.9 mm Round Cut From Tanzania

22.35 ct Oval Agate, 18.1 x 16.8 mm From Indonesia

0.35 ct Loose Orange Sapphire, 4.2 mm Round Cut From Tanzania

13.52 ct Green Aventurine, 18.5 x 12.5 mm Odd Shaped From Brazil

4.76 carat Diamond-Cut Tsavorite Garnet, loose Certified Tsavorite Garnet from Kenya, Natural Untreated Gems, 2.2 mm

58.69 ct Oval Coral, 42.5 x 27.5 mm From Mexico

Gemstone Information

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