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

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

Posted By MJC in January, 2024

Source: Bizrate

Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

Source: Bizrate

Overall Rating -> 10

Selection ability was straightforward and easy.

Posted By Dave in May, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Super easy to do business for great products.

Posted By BoBBy in January, 2024

Source: Bizrate

Overall Rating -> 10

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

Posted By Fl_Beachcomber in October, 2023

Source: Bizrate

Overall Rating -> 10

Great selection of various gems, easy to navigate site

Posted By Josh in August, 2023

Source: Bizrate

Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 2023

Source: Bizrate

Overall Rating -> 10

all good

Posted By John in December, 2023

Source: Bizrate

Overall Rating -> 10

Very detailed and great pictures

Posted By Alexandrite in November, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Love Gem select. great gems for the price. Can't beet them

Posted By Apps in September, 2023

Source: Bizrate

Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

Source: Bizrate

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 -> 9

Overall good, shipping prices just seem a little on the high side.

Posted By Steve in August, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

0.72 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 4.9 mm

17.64 ct Round Howlite, 19.8 mm From the United States

4.84 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.7 x 10.2 mm

1.03 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 6.9 mm

5.68 ct Round Rutile Quartz, 12.2 mm From India

1.14 carat Brown Malaya Garnet, Marquise Cut loose Malaya Garnet from Tanzania, Natural Untreated Gem, 9 x 4.7 mm

12.95 ct Marquise Rainbow Moonstone, 25.5 x 11.4 mm From the United States

0.73 ct Blue Kyanite, 6.3 x 4.1 mm Oval Cut From Nepal

8.1 ct White Quartz, 12.8 x 12.7 mm Asscher Cut From Brazil

3.7 carat White Topaz, Oval loose Topaz from Brazil, Natural Untreated Gem, 11.1 x 9.1 mm

9.43 ct Oval Coral, 18.1 x 14.5 mm From Indonesia

8.83 ct Brown Moonstone, 15.5 x 9.7 mm Oval Cut From India

1.75 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.3 x 3.6 mm

1.87 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 4.6 x 2.9 mm

12.53 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 17 x 11.9 mm

0.25 ct Octagon Cut Iolite, 5 x 2.9 mm From Madagascar

2.32 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.1 x 9.1 mm

6.1 carat Pear Rainbow Moonstone, loose Certified Rainbow Moonstone from the United States, Natural Untreated Gem, 18.4 x 9.5 mm

0.57 ct Violet Spinel, 5 mm Round Cut From Tanzania

6.29 ct Odd Shaped Druzy Variscite, 23.7 x 9.9 mm From China

0.66 ct Loose Yellow Sapphire, 4.5 x 4.5 mm Cushion Cut From Tanzania

2.03 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9.1 x 8.9 mm

5.57 ct Oval Cut Peridot, 8 x 5.9 mm From China

0.87 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gems, 5.2 x 5.1 mm

2.12 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gem, 6.9 mm

1.9 ct Oval Chocolate Opal, 12.9 x 8.8 mm From Ethiopia

3.4 carat Yellow Citrine, Cushion Buff Top loose Citrine from Brazil, Natural Untreated Gem, 10 x 10 mm

1.47 carat Yellow Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.2 x 6.1 mm

0.19 ct Yellow Sphalerite, 3.3 mm Round Cut From Spain

24.61 ct Oval Jasper, 32.3 x 20.1 mm From Indonesia

1.41 ct Purple Spinel, 6.7 x 5.4 mm Cushion Cut From Tanzania

1.47 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5 x 4.9 mm

Gemstone Information

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