Calibrated 16 x 12 mm Oval Shape Natural Loose Gemstones: GemSelect

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 oval shapes, facet cut and cabochon gems available now in 16 x 12 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 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 round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most 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

I really enjoy browsing through GemSelect. The selection is always marvelous and I love how detailed everything is described. The only thing I noticed is that when browsing through my phone, the videos of the gems do not load. If there were more videos of the gems, that would be amazing, though I understand that is a lot of work on GemSelect's part! Checking out is also very fast and easy, and I love that the return policy is very good, though I hope I don't have to use it anytime soon.

Posted By ChiChi in January, 2024

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

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

I have received emails for about a year and today is the condition that had me decide on the purchase

Posted By Tim in April, 2024

Source: Bizrate

Overall Rating -> 10

The site is very easy to use and I will continue to shop here. The quality is superb

Posted By Genia in January, 2024

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

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

Easy to use website, made it very easy to buy. Will shop here again.

Posted By Bjorn in January, 2024

Source: Bizrate

Overall Rating -> 10

all good

Posted By John in December, 2023

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

Always an easy experience using Gem select.

Posted By Jeff in November, 2023

Source: Bizrate

Overall Rating -> 10

Love the variety of stones, sizes and the prices

Posted By Dorita in March, 2024

Source: Bizrate

Overall Rating -> 10

I bought a small ring green so I may practice my jewelry making.

Posted By HairyOtter in July, 2023

Source: Bizrate

Overall Rating -> 10

Everthing about researching and ordering from Gemselect was easy and uncomplicated. In the past I had payment problems, but your customer rep, Thomas, helped me get everything right. I will continue using Gemselet in the future for these reasons.

Posted By WildwillyfromArizona in August, 2023

Source: Bizrate

Gemstones A-Z

Buy Oval Shape 16x12 mm Gems

6.96 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.2 x 10.1 mm

4.07 ct Asscher Cut Rose Quartz, 10.3 x 10 mm From South Africa

6.34 ct Oval Strawberry Quartz, 10.1 x 8.2 mm From Russia

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

19.77 ct Brown Moonstone, 22.1 x 15.9 mm Oval Cut From India

5.86 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16 x 11.8 mm

6.89 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 13.8 x 11 mm

2.33 ct Green Apatite, 7.6 x 7.6 mm Asscher Cut From Madagascar

0.69 carat Heart Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 6.9 x 5.1 mm

14.78 ct Round Labradorite, 16.1 mm From Madagascar

1.2 ct Oval Cut Kornerupine, 7.4 x 5.8 mm From Sri Lanka

2.42 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 6.1 mm

2.02 ct Yellow Beryl, 8.1 x 5.9 mm Oval Cut From Madagascar

3.46 carat Square Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 4.1 x 3.7 mm

3.89 ct Orange Sunstone, 11.8 x 9.7 mm Oval Cut From India

3.03 ct Loose Baguette Labradorite, 8.9 x 7 mm From Madagascar

1.65 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 5.3 x 4.1 mm

4.07 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gem, 16 x 9.9 mm

0.45 carat Orange Spessartite Garnet, Pear Shape loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.1 x 3.9 mm

0.91 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

0.43 ct Loose White Sapphire, 4.5 mm Diamond Cut From Madagascar

3.52 carat Red Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 9.1 x 7.8 mm

1.24 carat Green Tourmaline, Round Cabochon loose from Mozambique, Natural Untreated Gem, 6.1 mm

1.29 ct Oval Sillimanite Cat's Eye, 6.5 x 6.2 mm From Madagascar

15.79 carat Pear Howlite, loose Certified Howlite from the United States, Natural Untreated Gem, 23.6 x 17.5 mm

24.37 ct Oval Jasper, 29.9 x 20.6 mm From Indonesia

5.12 carat Yellow Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gem, 20 x 9.7 mm

2.14 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 7.4 x 6.3 mm

26.83 ct Oval Jasper, 32.2 x 18.4 mm From Indonesia

3.49 ct Loose Oval Cut Strawberry Quartz, 12 x 10 mm From India

22.44 ct Round Rainbow Moonstone, 22 mm From the United States

2.37 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9.2 x 7.2 mm

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