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

The website is easy to navigate and has a great selection. I am an amateur silver smith casting jewelry with stones

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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

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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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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

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Overall Rating -> 10

I purchase all of my stones from GemSelect! They're the best I've found for both selection and value.

Posted By Terry in June, 2023

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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

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Overall Rating -> 10

Wonderful selection of gems to choose from. Have made many purchases and was only slightly disappointed once.

Posted By Teemo in February, 2024

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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

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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

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Overall Rating -> 9

I am of the opinion that the company gem select cares about the product beautiful gems it sells and the cost of the gem I purchased was small i was treated as if it cost a lot of money and product was described in detail and i felt good about the little stones i had ordered.

Posted By Sparkle in March, 2024

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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

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Overall Rating -> 10

Everything fine.

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Overall Rating -> 10

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

Posted By HairyOtter in July, 2023

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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

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Overall Rating -> 10

all good

Posted By John in December, 2023

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Gemstones A-Z

Buy Oval Shape 16x12 mm Gems

1.18 carat Baguette Facet Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gems, 3 x 1.7 mm

0.98 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.5 mm

3.72 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 4 mm

5.62 ct Green Agate, 18.7 x 9.5 mm Carved From India

9.42 ct Yellow Cat's Eye Apatite, 12.6 x 11.5 mm Oval Cut From Kenya

0.34 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 6.5 x 4.4 mm

3.36 carat Oval Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 7.9 x 6 mm

2.69 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gem, 9 x 6.1 mm

12.62 ct Oval Pietersite, 24.1 x 14.2 mm From Namibia

6.2 carat Swiss Blue Topaz, Round loose Topaz from Brazil, Natural Gems, 9.2 mm

2.19 carat Orange Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 8.3 x 6.2 mm

4.73 carat Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11 x 10.5 mm

40.89 carat Pear Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gem, 29.1 x 24.6 mm

0.45 ct Loose Purple Sapphire, 5.7 x 3.8 mm Oval Cut From Tanzania

0.85 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 9.8 x 4.9 mm

2.8 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.5 x 7.8 mm

1.25 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 4.9 mm

1.93 ct Yellow Apatite, 7.8 x 7.6 mm Asscher Cut From Madagascar

6.45 carat Pear Shape Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gem, 15.2 x 11.1 mm

3.88 ct Round Cut Strawberry Quartz, 8.2 mm From Russia

36.22 ct Multicolor Fossil Coral, 21.7 x 14.6 mm Cushion Cut From Indonesia

3.19 carat Orange Zircon, Emerald Cut loose Zircon from Tanzania, Natural Untreated Gems, 6.2 x 4.2 mm

7.76 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 8.2 x 6.1 mm

2.03 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.1 x 7.1 mm

3.73 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 7.1 x 5.2 mm

1.98 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 8.1 mm

13.27 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 23.3 x 13.3 mm

18.51 ct Oval Cut Rose Quartz, 19.5 x 16 mm From South Africa

2.52 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Sri Lanka, Natural Untreated Gems, 5.7 x 5.7 mm

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

13.21 ct Fancy Boulder Opal, 14.4 x 14.1 mm From Australia

1.06 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 9.3 x 3.6 mm

Gemstone Information

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Gemstone EDUCATION

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