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

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

Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.

Posted By Dee in September, 2023

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Overall Rating -> 9

GemSelect has a fantastic assortment of Semi-precious stones. I have not found any other web site with the variety you have.

Posted By RobDill in August, 2023

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Overall Rating -> 10

Perfect size I was looking for and great price

Posted By Izzy in September, 2023

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Overall Rating -> 10

Easy to use,I have spent many hours looking at the site

Posted By Skip in November, 2023

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Overall Rating -> 10

Great experience! First time buyer

Posted By Todi89 in February, 2024

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Overall Rating -> 10

Always an easy experience using Gem select.

Posted By Jeff in November, 2023

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Overall Rating -> 10

The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

Posted By Orchidisle in February, 2024

Source: Bizrate

Overall Rating -> 9

Gemselect is a good website with a great selection of loose gems for sale. The prices are fairly decent, with the only negative being the cut quality of the gems. This is my go to retailer for gemstones and will continue to be, given that the packages arrive in a timely manner.

Posted By Lunchies in April, 2024

Source: Bizrate

Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

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Overall Rating -> 9

They had a easy to navigate directory for all the currently available products. You could filter by almost any parameter you could think of. The checkout process was smooth and painless, and the shipping was quick and efficient. All-in-all, it was a very positive experience.

Posted By Brian in May, 2024

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Overall Rating -> 9

It went well

Posted By Rob in December, 2023

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Overall Rating -> 10

all good

Posted By John in December, 2023

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Overall Rating -> 10

Purchased for my granddaughter she was very pleased with it.

Posted By Charlie in April, 2024

Source: Bizrate

Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

Posted By Oakcityceo in May, 2023

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Gemstones A-Z

Buy Square Shape 4x4 mm Gems

3.23 carat Half Drilled Briolette Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.9 mm

2.06 carat Blue Green Fluorite, Pear Shape loose Fluorite from India, Natural Untreated Gem, 9 x 6.9 mm

1.46 ct Loose Round Cut Lapis Lazuli, 5.9 mm From Afghanistan

0.32 carat Round Cabochon Emerald, loose Certified Emerald from Colombia, Natural Gem, 4.2 mm

23.71 ct Fancy Coral, 21 x 14 mm From Indonesia

5.83 ct Oval Actinolite Cat's Eye, 14 x 11.2 mm From the United States

1.3 ct Loose Orange Moonstone, 10 x 5.1 mm Marquise Cut From India

16.26 ct Green Aventurine, 19 x 10.4 mm Cushion Cut From Brazil

1.52 ct Multicolor Mystic Quartz, 8 mm Round Concave Cut From Brazil

5.27 carat Brown Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 12.2 x 8.9 mm

4.03 ct Blue Star Sapphire, 6.9 x 5.1 mm Oval Cut From Thailand

39.01 ct Fancy Jasper, 36.2 x 15.1 mm From Indonesia

15.15 ct Round Rainbow Moonstone, 16.8 mm From the United States

8.38 ct Yellow Quartz, 8.7 x 8.5 mm Carved From Brazil

4.55 carat Oval Strawberry Quartz, loose Certified from India, Natural Untreated Gem, 12.1 x 9.9 mm

2.65 carat Emerald Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.8 x 4 mm

3.29 ct Orange Sunstone, 6.2 x 4.2 mm Oval Cut From Russia

1.33 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 8 x 6.2 mm

3.38 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10.1 x 8.1 mm

3.03 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 9.2 x 9.1 mm

5.38 carat Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.4 x 11.4 mm

2.17 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.8 x 4.9 mm

1.47 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.1 x 7 mm

34.78 ct Round Labradorite, 25.3 mm From Madagascar

3.08 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 7.1 x 7.2 mm

2.64 carat Diamond Ruby, loose Certified Ruby from Myanmar, Natural Gems, 3.4 mm

0.96 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 7.2 x 5.2 mm

0.52 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.1 x 4.1 mm

5.13 ct Round Concave Cut Mystic Quartz, 12.1 mm From Brazil

3.43 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.9 x 3.8 mm

2.69 ct Blue Star Sapphire, 7 x 5.2 mm Oval Cut From Thailand

2.08 carat Oval Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 7 x 5.1 mm

Gemstone Information

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