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 -> 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 -> 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

Source: Bizrate

Overall Rating -> 10

I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.

Posted By Cahall in March, 2024

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

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber in September, 2023

Source: Bizrate

Overall Rating -> 10

Great site

Posted By Lord of Bananas in November, 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 -> 9

It was simple and clear to understand.

Posted By Thora007 in December, 2023

Source: Bizrate

Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 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

Easy to use as always and in all steps from opening site to paying.

Posted By Pete in February, 2024

Source: Bizrate

Overall Rating -> 10

Everything was fine.

Posted By Matt in March, 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

The website is easy to navigate and the images are incredible.

Posted By Lindsy in October, 2023

Source: Bizrate

Overall Rating -> 10

I have had and will always have a great time shopping at GemSelect. It's a great web site with great products and great service.

Posted By Apps in November, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

0.87 carat Yellow Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gem, 9 x 5.1 mm

5.7 ct Yellow Quartz, 12.5 x 10.1 mm Oval Cut From Brazil

0.92 ct Loose Oval Cut Black Opal, 8.5 x 6.6 mm From Ethiopia

0.7 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gem, 6.9 x 5 mm

7.78 ct Red Andesine Labradorite, 11.2 x 9.1 mm Oval Cut From Congo

0.66 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 8.2 x 4 mm

2.03 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.1 x 6.9 mm

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

1.37 carat Trillion Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gems, 6.1 x 6 mm

5.57 carat Pear Fire Agate, loose Certified Fire Agate from Mexico, Natural Untreated Gem, 13.5 x 9.7 mm

0.41 carat Pear Shape Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.6 x 4.4 mm

5.73 ct Round Cut Smoky Quartz, 12 mm From Brazil

1.04 carat Pink Morganite, Pear Shape loose Morganite from Brazil, Natural Untreated Gem, 9.5 x 5.4 mm

0.88 ct Oval Cut Peridot, 7.1 x 5.1 mm From China

5.06 ct Yellow Quartz, 13.2 x 8 mm Marquise Concave Cut From Brazil

7.82 ct Yellow Quartz, 14.9 x 12.9 mm Hexagon Cut From Brazil

2.67 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 4.9 x 3 mm

2.9 carat Blue Sapphire, Princess-Cut loose Sapphire from Sri Lanka, Natural Gems, 2.3 x 2.3 mm

11.13 ct Yellow Quartz, 17.2 x 16.4 mm Carved From Brazil

0.53 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gems, 5.1 x 3.2 mm

0.43 ct Loose Gray Spinel, 6 x 3.6 mm Octagon Cut From Tanzania

8.82 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13.6 x 13.1 mm

23.46 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.1 mm

20.64 ct Pencil Cut Tiger's Eye, 30.9 mm From Thailand

3.19 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.9 x 5 mm

3.62 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

1.2 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 9 x 7 mm

2.79 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 7.2 x 3.6 mm

44.06 ct Oval Agate, 30.2 x 22.2 mm From India

19.53 ct Rainbow Pyrite, 23.8 x 17.9 mm From Russia

43.85 ct Cushion Lapis Lazuli, 30.5 x 20 mm From Afghanistan

1.22 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 5.6 mm

Gemstone Information

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Gemstone EDUCATION

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