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

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024

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Overall Rating -> 10

I was pleased with the selection of gems, the ease of navigating, and the smooth checkout

Posted By JamesMichael781 in September, 2023

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Overall Rating -> 10

Everything was fine.

Posted By Matt in March, 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 -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

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Overall Rating -> 10

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

Posted By Fl_Beachcomber in October, 2023

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Overall Rating -> 8

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

Posted By MI photo in May, 2023

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Overall Rating -> 10

Very Good

Posted By Julian in July, 2023

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Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

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Overall Rating -> 9

My first purchase went well. I will purchase more gems in the future.

Posted By NoHalalAl in March, 2024

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Overall Rating -> 10

Great Job today! No issues!

Posted By Samlovesgems777 in August, 2023

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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

Purchased for my granddaughter she was very pleased with it.

Posted By Charlie in April, 2024

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Overall Rating -> 10

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 2023

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Overall Rating -> 10

The website is easy to search, the variety of gems is excellent and the educational information is interesting and helpful! Love browsing and shopping the GemSelect website!

Posted By Happiness in January, 2024

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

1.18 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 6.2 x 5 mm

5 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gems, 6.8 x 5 mm

1.85 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3 mm

1.19 ct Blue Kyanite, 6.2 mm Round Cut From Nepal

8.79 carat Pink Topaz, Cushion loose Topaz from Brazil, Natural Gem, 14.1 x 10 mm

0.45 ct Square Cut Color-Change Diaspore, 4.6 x 4.5 mm From Turkey

19.4 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 28.6 x 15.4 mm

2.11 ct Oval Cut Andalusite, 6.1 x 4.1 mm From Brazil

20.03 ct Carved Prehnite, 19.3 x 13.3 mm From South Africa

5.44 ct Green Agate, 12.2 x 10.1 mm Octagon Cut From India

3.18 ct Fancy Fire Agate, 10.1 x 8.3 mm From Mexico

2.09 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.1 x 3.1 mm

21.47 ct Cushion Rose Cut Lapis Lazuli, 22.1 x 21.6 mm From Afghanistan

1.41 ct Blue Kyanite, 6.7 mm Round Cut From Nepal

9.62 ct Octagon Concave Cut Smoky Quartz, 14 x 14 mm From Brazil

1.26 ct Purple Spinel, 6.7 x 5.6 mm Cushion Cut From Tanzania

11.49 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 17.8 x 13.3 mm

1.74 ct Yellow Sphene, 8 x 6.5 mm Oval Cut From Sri Lanka

23.49 ct Oval Quartz With Marcasite, 20.9 x 16.8 mm From Brazil

1.81 ct Blue Kyanite, 8.1 x 6.1 mm Oval Cut From Nepal

1.56 ct Round Cut Golden Beryl, 7.9 mm From Madagascar

1.78 ct Loose Yellow Sapphire, 8.3 x 6.7 mm Oval Cut From Madagascar

2.78 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 5 mm

9.32 ct Baguette Malachite, 9.2 x 7.4 mm From Congo

2.41 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 6.1 mm

2.4 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.8 x 7.4 mm

0.6 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 4.9 x 4.1 mm

8.4 ct Round Quartz Cat's Eye, 12.2 mm From India

17.47 ct Carved Prehnite, 19.7 x 12.6 mm From South Africa

0.61 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 7 x 4.9 mm

15.07 ct Brown Moonstone, 16 x 12.8 mm Carved From India

0.19 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 4.7 x 2.9 mm

Gemstone Information

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