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

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Overall Rating -> 10

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Overall Rating -> 10

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Overall Rating -> 10

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Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

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Overall Rating -> 9

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Posted By Brian in May, 2024

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Overall Rating -> 10

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

2.21 carat Violet Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.1 x 3.1 mm

1.4 ct Oval Cut Black Opal, 10.4 x 7.4 mm From Ethiopia

0.93 ct Purple Spinel, 5.7 x 5.1 mm Cushion Cut From Tanzania

23.6 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 34.3 x 16.8 mm

0.6 ct Oval Chrysoberyl Cat's Eye, 5.1 x 4.4 mm From Sri Lanka

1.5 ct Yellow Beryl, 7.9 mm Round Cut From Madagascar

2.72 ct Black Star Sapphire, 8.2 x 6.4 mm Oval Cut From Thailand

6.92 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 9.8 x 8.1 mm

4.99 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gems, 12.1 x 6.1 mm

4.16 ct Red Sunstone, 12 x 9.9 mm Oval Cut From India

2.78 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.2 x 10 mm

3.12 ct Oval Cut Rainbow Moonstone, 11.4 x 9.1 mm From India

13.33 ct Baguette Maw-Sit-Sit, 16.3 x 10.4 mm From Myanmar

21.92 ct Square Hematite, 15.1 x 14.7 mm From Brazil

12.53 ct Carved Prehnite, 16.1 x 12.3 mm From South Africa

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

0.48 ct Loose Orange Sapphire, 4.3 x 4.2 mm Cushion Cut From Tanzania

15.88 ct Oval Pietersite, 19.6 x 15.4 mm From Namibia

0.71 ct Violet Spinel, 6.1 x 5.2 mm Oval Cut From Tanzania

2.73 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12 x 10 mm

9.15 carat Bi-color Ametrine, Emerald-Cut loose Ametrine from Brazil, Natural Untreated Gem, 13.4 x 11.7 mm

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

4.01 ct Green Apatite, 8.9 x 8.8 mm Asscher Cut From Madagascar

6.37 ct Loose Oval Lapis Lazuli, 15 x 11.1 mm From Afghanistan

0.84 ct Loose Pink Sapphire, 5 x 4 mm Oval Cut From Tanzania

4.02 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.8 x 7.9 mm

0.08 ct Black Diamond, 2 mm Diamond Cut From India

0.58 carat Teal Sapphire, Trillion-Cut loose Sapphire from Madagascar, Natural Gem, 5 x 4.8 mm

13.69 ct Oval Bloodstone, 14.7 x 12.4 mm From Madagascar

0.82 ct Octagon Cut Color-Change Diaspore, 6.4 x 4.5 mm From Turkey

1.36 ct Blue Kyanite, 7.1 x 5.2 mm Oval Cut From Nepal

2.72 ct Oval Rutile Quartz, 10.1 x 7.9 mm From India

Gemstone Information

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