Calibrated 4 x 4 mm Square Shape Loose Natural Gemstones from GemS...

Some people by 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 Square shapes, facet cut and cabochon gems available now in 4 mm x 4 mm 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 meant nor 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 slightly higher even. 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

Great selection of various gems, easy to navigate site

Posted By Josh in August, 2023

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 -> 8

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

Posted By MI photo in May, 2023

Source: Bizrate

Overall Rating -> 10

My last experience was good, in fact every experience I have had with them has met my expectations or surpassed them. These are really good people to work with.

Posted By Spinach in May, 2023

Source: Bizrate

Overall Rating -> 10

Very detailed and great pictures

Posted By Alexandrite in November, 2023

Source: Bizrate

Overall Rating -> 9

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

Posted By NoHalalAl in March, 2024

Source: Bizrate

Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

Source: Bizrate

Overall Rating -> 8

Very easy to find the specific stone I was looking for. I am pleased by both the selection and the price of the stones that are available. The only "bad" thing that I have to say is that the interface of the site is outdated.

Posted By Nick in March, 2024

Source: Bizrate

Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

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 -> 10

It was easy to find the color gem I desired and checkout was simple as well. Very excited to receive my gemstone.

Posted By Nikki J in September, 2023

Source: Bizrate

Overall Rating -> 10

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

Source: Bizrate

Overall Rating -> 10

Selection and purchasing online was very easy

Posted By Aggy in January, 2024

Source: Bizrate

Overall Rating -> 10

all good

Posted By John in December, 2023

Source: Bizrate

Overall Rating -> 9

Well presented images, clear information, quick and easy check out.

Posted By Mr. Bezel in July, 2023

Source: Bizrate

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Gemstones A-Z

Buy Square Shape 4x4 mm Gems

2.9 ct Round Onyx, 7.1 mm From Sri Lanka

1.56 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 22.2 x 3.2 mm

22.14 ct Odd Shaped Agate Geode, 17.6 x 16.9 mm From Mexico

28.73 ct Carved Ruby-Zoisite, 22.9 x 22.2 mm From Tanzania

6.3 ct Oval Cut Smoky Quartz, 11.5 x 9.1 mm From Brazil

1.51 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 10.2 x 8.1 mm

1.33 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 12.6 x 3.7 mm

4.88 ct Green Jade, 12.3 x 10 mm Oval Cut From Myanmar

0.98 carat Red Spessartite Garnet, Briolette loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.9 mm

1.92 carat Violet Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 4.8 x 3.1 mm

14.26 ct Oval Coral, 25 x 17.2 mm From Indonesia

2.52 ct Oval Prehnite, 7.7 x 5.8 mm From South Africa

1.99 carat Swiss Blue Topaz, Square loose Topaz from Brazil, Natural Gem, 6.9 x 6.8 mm

1.77 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 11.6 x 6.3 mm

10.9 ct Oval Bloodstone, 16.4 x 10.5 mm From Madagascar

0.75 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

2.47 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.1 x 5.2 mm

2.8 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.6 x 9.1 mm

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

6.96 ct Marquise Ruby-Zoisite, 22 x 9.3 mm From Tanzania

1.79 ct Round Strawberry Quartz, 7.1 mm From Russia

18.77 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.1 x 14 mm

6.15 ct Fancy Fire Agate, 17.4 x 8.7 mm From Mexico

3.66 ct Loose Trillion Concave Cut Mystic Quartz, 8.2 x 8.1 mm From Brazil

9.29 ct Round Checkerboard Labradorite, 12.2 mm From Madagascar

6.89 ct Green Amazonite, 17.8 x 9.1 mm Marquise Cut From Madagascar

3.7 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4 x 4 mm

3.32 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 4.2 x 4.1 mm

1.33 ct Oval Cut Golden Beryl, 8.2 x 6 mm From Madagascar

0.67 ct Loose Pink Sapphire, 6.3 x 4.5 mm Oval Cut From Madagascar

0.25 ct Oval Cut Kornerupine, 4.5 x 3.4 mm From Sri Lanka

0.26 ct Black Diamond, 3 mm Diamond Cut From India

Gemstone Information

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Gemstone EDUCATION

WE ARE LOCATED AT