Buy 6.5 mm Round Calibrated Gemstones from GemSelect

Some people buy 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 6.5 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 even slightly higher. 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

Easy to find products I want. I've ordered several times from gem select and never any problems. Will order again. Thank you.

Posted By Ray in January, 2024

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Overall Rating -> 10

Selection and purchasing online was very easy

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Overall Rating -> 10

Great experience! First time buyer

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Overall Rating -> 10

Great website and information

Posted By Moonshot in December, 2023

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Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

Posted By Ray in December, 2023

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Overall Rating -> 10

Great Job today! No issues!

Posted By Samlovesgems777 in August, 2023

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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

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Overall Rating -> 10

I have started a small gem brokerage. I find stones to meet clients needs. Gemselect has helped me find what people what.

Posted By Pirates Bounty in April, 2024

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Overall Rating -> 10

I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!

Posted By Ana in September, 2023

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Overall Rating -> 10

Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

Posted By Kate in December, 2023

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Overall Rating -> 9

The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

Posted By Kasper in June, 2023

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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

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Overall Rating -> 10

I FOUND WHAT I WANT IT

Posted By GABY in March, 2024

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Overall Rating -> 10

Love gemselect

Posted By Joshua Howard in March, 2024

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Overall Rating -> 10

Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

Posted By Meow in June, 2023

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

0.65 ct Loose Yellow Sapphire, 4.8 mm Round Cut From Tanzania

14.48 carat Pear Checkerboard Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gems, 18.3 x 13.3 mm

0.65 ct Loose Pink Sapphire, 5.7 x 3.8 mm Oval Cut From Madagascar

9.43 ct Oval Pietersite, 24.8 x 12.2 mm From Namibia

23.14 ct Odd Shaped Druzy Azurite, 17.6 x 16.9 mm From the United States

4.06 carat Brown Tourmaline, Cushion loose Tourmaline from Mozambique, Natural Untreated Gem, 8.9 x 8.3 mm

2.6 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5 x 5 mm

7.26 ct Black Spinel, 9.3 mm Round Rose Cut From Thailand

2 carat Orange Hessonite Garnet, Round loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.3 mm

1.18 ct Loose Orange Sapphire, 6.1 x 4.1 mm Oval Cut From Tanzania

2.17 carat Sky Blue Topaz, loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

1.31 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.2 x 4.1 mm

0.93 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 9.9 x 3.7 mm

2.76 ct Asscher Cut Rose Quartz, 9.2 x 9 mm From South Africa

4.89 carat Trillion Rhodolite Garnet, loose Certified Rhodolite Garnet from Tanzania, Natural Untreated Gems, 5.1 x 5 mm

2.01 carat Sky Blue Topaz, loose Topaz from Brazil, Natural Gems, 6.9 x 5 mm

1.95 carat Yellow Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 6.9 mm

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

3.76 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 10.9 x 8.9 mm

21.68 ct Yellow Quartz, 16.9 x 13.1 mm Carved From Brazil

8.71 carat Uvarovite Garnet Drusy, loose Certified Uvarovite Garnet Drusy from Russia, Natural Untreated Gem, 18 x 12.1 mm

7.25 ct Yellow Quartz, 13.1 x 11.9 mm Carved From Brazil

1.15 carat Orange Hessonite Garnet, Baguette Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.2 x 4.5 mm

2.08 carat Pear Shape Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gems, 8.1 x 6 mm

24.06 carat Cushion Ruby, loose Certified Ruby from Madagascar, Natural Gem, 15.2 x 14.9 mm

0.99 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5 x 5 mm

2.08 carat White Zircon, Diamond-Cut loose Zircon from Colombia, Natural Gem, 7 mm

0.79 ct Pink Spinel, 5.6 x 4.8 mm Cushion Cut From Tanzania

13.18 carat Trillion Ammolite, loose Certified Ammolite from Canada, Natural Gem, 21 x 15.9 mm

2.26 ct Octagon Cut Peridot, 6 x 4.1 mm From China

4.46 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7 x 5.1 mm

1.21 carat Pear Shape Chrysoberyl, loose Certified Chrysoberyl from Sri Lanka, Natural Untreated Gem, 9.4 x 5.5 mm

Gemstone Information

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