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

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Posted By Becky in August, 2023

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Overall Rating -> 10

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

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Overall Rating -> 10

After having looked at other purchasing sites, this is my first choice.

Posted By MJC in January, 2024

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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

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Overall Rating -> 10

I bought a small ring green so I may practice my jewelry making.

Posted By HairyOtter in July, 2023

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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 !

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Overall Rating -> 9

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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

I had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

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Overall Rating -> 10

Love the variety of stones, sizes and the prices

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It was easy to search and find what i wanted

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Overall Rating -> 10

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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.

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

1.38 ct Loose Purple Sapphire, 7.5 x 5.4 mm Cushion Cut From Tanzania

1.44 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8.2 x 8.1 mm

16.32 ct Oval Rainbow Moonstone, 21.4 x 12.8 mm From the United States

6.48 ct Oval Actinolite Cat's Eye, 14.8 x 11.7 mm From the United States

0.05 ct Blue Diamond, 2.2 mm Diamond Cut From India

7.63 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 11.1 x 9 mm

13.29 ct Loose Pear Charoite, 19.6 x 12.5 mm From Russia

2.3 ct Loose Orange Moonstone, 9.1 x 6.9 mm Cushion Cut From India

2.57 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.7 x 7.8 mm

1.64 carat Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5.2 mm

2.09 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.7 x 6.8 mm

10.69 ct Oval Tiger's Eye, 11.5 x 9 mm From Thailand

1.16 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.1 x 7.1 mm

5.21 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9.1 x 8.9 mm

1.49 ct Purple Spinel, 6.1 x 5.9 mm Cushion Cut From Tanzania

1.75 ct Round Cut Strawberry Quartz, 7.9 mm From Russia

3.28 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5 mm

3.57 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 9 x 8.9 mm

2.94 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.8 x 8.7 mm

1.73 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 5 x 4.1 mm

8.71 ct Heart Rose Cut Onyx, 10.5 x 10.4 mm From Sri Lanka

4.91 ct White Moonstone, 8.1 mm Round Cut From India

0.03 ct Blue Diamond, 2 mm Diamond Cut From India

1.43 ct Loose Yellow Sapphire, 6.7 x 5.3 mm Cushion Cut From Tanzania

2.93 ct Orange Sunstone, 10.1 x 8.1 mm Oval Cut From India

34.8 carat Pear Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gem, 31.2 x 25 mm

4.96 ct Orange Sunstone, 10 x 8.1 mm Oval Cut From India

2.88 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 5.9 x 4 mm

5.51 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 9 x 7.2 mm

3.38 ct Loose Round Concave Cut Mystic Quartz, 10.1 mm From Brazil

1.88 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.9 x 5 mm

28.79 ct Loose Violet Lepidolite, 36.7 x 10.2 mm Pencil Cut From the United States

Gemstone Information

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