Calibrated 12 x 10 mm Cushion Shape Loose Natural Gemstones from G...

Some people by gems by color or price, but for many, it is best to buy gems by size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated cushion shapes, facet cut and cabochon gems available now in 12 mm x 10 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.

Read All

Gemstone Information

Find More Content Here

Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

Overall Rating -> 10

I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!

Posted By Ana in September, 2023

Source: Bizrate

Overall Rating -> 10

I have used this site for sseveral years now. All has been great. I started collection gems from GemSelect for years and wanted to collect at least one of most stones. I loved Safers because the mols is a 9 + and they come in every color. This is the best place to buy gems for the assortment and price. Great place to learn about gems too. Sometimes the shipping is a little on the long side. But I would give them a 9.9 out of 10 !!

Posted By Steve in July, 2023

Source: Bizrate

Overall Rating -> 10

Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

Posted By Devi in October, 2023

Source: Bizrate

Overall Rating -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

Posted By NJD in September, 2023

Source: Bizrate

Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

Source: Bizrate

Overall Rating -> 10

I was pleased with the selection of gems, the ease of navigating, and the smooth checkout

Posted By JamesMichael781 in September, 2023

Source: Bizrate

Overall Rating -> 10

The website was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

Posted By AV in May, 2023

Source: Bizrate

Overall Rating -> 10

My overall interaction with your website was pleasant, as always.

Posted By RJ in April, 2024

Source: Bizrate

Overall Rating -> 10

It was easy to navigate and I hope that the gem is as nice as the picture

Posted By 1 in April, 2024

Source: Bizrate

Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

Source: Bizrate

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

I’ve enjoyed purchasing stones from this site. It’s convenient and fairly priced.

Posted By Chico in May, 2023

Source: Bizrate

Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

Source: Bizrate

Gemstones A-Z

Buy Cushion Cut 12x10 mm Gems

8.14 ct Green Jadeite, 21.9 x 10.1 mm Marquise Cut From Myanmar

0.39 ct Loose Orange Sapphire, 6.1 x 4.1 mm Oval Cut From Tanzania

8.41 carat Swiss Blue Topaz, Carved Flower loose Topaz from Brazil, Natural Gem, 10.5 x 10.4 mm

1.23 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 16.1 x 3.4 mm

2.53 carat Green Tourmaline, Rondelle Cut loose Tourmaline from Mozambique, Natural Untreated Gems, 4.2 x 4.2 mm

2.61 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.2 mm

2.34 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10 x 5.1 mm

0.75 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 6 x 5.1 mm

1.8 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 15.9 x 3.9 mm

2.81 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 10.2 x 7.2 mm

7.36 carat Swiss Blue Topaz, Carved Flower loose Topaz from Brazil, Natural Gem, 13.3 x 10.2 mm

0.91 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 5 x 5 mm

10.98 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 18.8 x 13.8 mm

0.93 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gems, 6.2 x 4.1 mm

1.45 carat Round Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 3.7 mm

4.81 ct Loose Baguette Lapis Lazuli, 12.5 x 9 mm From Afghanistan

3.22 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.6 mm

1.48 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.4 x 3.6 mm

3.4 ct Yellow Quartz, 12.8 x 12.8 mm Carved From Brazil

2.39 ct Oval Checkerboard Rainbow Moonstone, 7 x 6 mm From India

10.69 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 19.7 x 13.3 mm

1.08 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9 x 6.9 mm

0.38 ct Loose Yellow Sapphire, 5 x 3.2 mm Octagon Cut From Tanzania

17.65 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 28.5 x 17.6 mm

0.57 carat Oval Color-Change Garnet, loose Certified Color-Change Garnet from Tanzania, Natural Untreated Gem, 5.9 x 4.1 mm

0.86 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 5 x 4.9 mm

2.87 carat Sky Blue Topaz, loose Topaz from Brazil, Natural Gems, 10 x 5 mm

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

24.53 ct Oval Jasper, 24.3 x 14.5 mm From Indonesia

3.52 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.2 x 9 mm

1.39 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 6.1 x 6.1 mm

1.08 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 8.9 x 4.6 mm

Gemstone Information

Gemstone SHOP

POLICIES

WHO ARE WE?

Gemstone EDUCATION

WE ARE LOCATED AT