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 -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

Source: Bizrate

Overall Rating -> 10

Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.

Posted By Dee in September, 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 -> 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

Selection ability was straightforward and easy.

Posted By Dave in May, 2023

Source: Bizrate

Overall Rating -> 10

I particularly like information about product provided with purchase.

Posted By Dick in May, 2023

Source: Bizrate

Overall Rating -> 8

I am currently pleased. I like the layout of the website.

Posted By RayPoppa in January, 2024

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 -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

Source: Bizrate

Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

Posted By Newfguy in February, 2024

Source: Bizrate

Overall Rating -> 10

the searching format was easy to find what i needed. It helped to be able to sort Lowest price to Highest because i wasnt looking to spend too much but i did want an actual stone and not imitation.

Posted By PixelComposer in January, 2024

Source: Bizrate

Overall Rating -> 10

I found it to be easy to browse and easy to use

Posted By Kyle in December, 2023

Source: Bizrate

Overall Rating -> 10

Fantastic dealer for quality gemstones. Website is easy to navigate, selection is superb, delivery of purchases is prompt. Easy to select incorrect payment options, however.

Posted By David W in May, 2023

Source: Bizrate

Overall Rating -> 10

My overall interaction with your website was pleasant, as always.

Posted By RJ in April, 2024

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Gemstones A-Z

Buy Round Shape 13 mm Gems

0.14 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

1.29 ct Oval Checkerboard Labradorite, 7.1 x 6.1 mm From Madagascar

30.57 ct Oval Jasper, 31.3 x 19.9 mm From Indonesia

1.31 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 5 mm

5.15 carat Square Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 4.6 x 4.5 mm

0.44 carat Blue Kyanite, Round loose Kyanite from Nepal, Natural Untreated Gem, 4.2 mm

2.14 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.9 x 6.1 mm

3.26 ct Square Cut Rainbow Moonstone, 3 x 3 mm From India

1.09 ct Blue Kyanite, 7 x 5.2 mm Oval Cut From Nepal

18.94 ct Oval Rutile Quartz, 26.6 x 12 mm From India

0.87 ct Octagon Cut Color-Change Diaspore, 5.4 x 5.1 mm From Turkey

2.38 ct Oval Strawberry Quartz, 9.1 x 7.2 mm From Russia

0.81 ct Purple Spinel, 5.6 x 4.8 mm Cushion Cut From Tanzania

3.16 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.2 x 4.3 mm

27.34 ct Oval Jasper, 30.2 x 21 mm From Indonesia

3.11 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5 mm

23.09 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 31.4 x 21 mm

1.49 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 7.1 x 5.1 mm

18.07 carat Pear Shape Amethyst, loose Certified from Brazil, Natural Untreated Gem, 21.1 x 16.1 mm

1.15 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 5.4 mm

1.37 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gems, 6.1 x 6 mm

0.26 carat Purple Sapphire, Pear Shape loose Sapphire from Madagascar, Natural Gem, 5.7 x 3.7 mm

4.54 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 6.7 x 6.8 mm

45.27 ct Yellow Star Sapphire, 20.9 x 17.1 mm Oval Cut From Madagascar

1.15 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7.2 x 5.3 mm

1.83 ct Round Cut Peridot, 4 mm From China

0.2 ct Blue Apatite, 3.6 mm Round Cut From Madagascar

14.29 ct Yellow Quartz, 10.1 x 10.1 mm Carved From Brazil

6.13 ct Oval Fire Agate, 16.7 x 9 mm From Mexico

1.6 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

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

68.06 ct Oval Pietersite, 47 x 29.4 mm From Namibia

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