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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Easy to use. Limited supply of higher quality gemstones.

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Overall Rating -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

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The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

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I love GemSelect, photos and details are great.

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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!

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I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

Posted By Sue in April, 2023

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Overall Rating -> 10

was just windowshopping and spotted a couple "Very Uncommons", a tsavorite & a demantoid garnet that were both in a size I was looking for, & that I could very easily pay for -- so figured I would grab the tsavo ASAP and got the demantoid to accompany so they wouldn't be lonely.

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Overall Rating -> 10

i love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

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Overall Rating -> 10

all good

Posted By John in December, 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.

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Overall Rating -> 9

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024

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Overall Rating -> 10

Interested in unusual stones and found many that I purchased or will purchase in the near future. I have been a customer of gem select for almost ten years and have always been pleased with buying experience and the delivered product

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Gemstones A-Z

Buy Oval Shape 16x12 mm Gems

7.62 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.1 x 11.9 mm

0.08 ct Green Diamond, 2.7 mm Diamond Cut From India

24.88 ct Oval Rose Quartz, 20.1 x 15.1 mm From South Africa

17.55 ct Octagon / Emerald Cut Hematite, 19.7 x 14.4 mm From Brazil

1.76 carat Orange Hessonite Garnet, Round loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.6 mm

1.79 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5.1 mm

1.18 ct Cushion Cut Color-Change Diaspore, 7.4 x 5.1 mm From Turkey

7 carat Pink Morganite, Pear loose Morganite from Afghanistan, Natural Untreated Gem, 15.9 x 10.8 mm

21.59 ct Fancy Boulder Opal, 24.1 x 18.3 mm From Australia

5.68 ct Yellow Quartz, 11.9 x 11.4 mm Carved From Brazil

1.64 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 7 x 5 mm

6.07 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9.1 x 8.9 mm

0.54 ct Loose Violet Sapphire, 5.9 x 4.2 mm Oval Cut From Tanzania

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

26.27 ct Oval Seraphinite, 31.5 x 17.7 mm From Russia

3.81 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

4.02 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.8 x 9.1 mm

43.77 carat Blue Green Aquamarine, Oval loose Aquamarine from Madagascar, Natural Untreated Gem, 25.2 x 20.6 mm

1.08 carat Teal Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 6.7 x 4.8 mm

1.26 carat Blue Sapphire, Princess-Cut loose Sapphire from Tanzania, Natural Gems, 3 x 3 mm

8.89 carat Blue Green Turquoise, Pear loose Turquoise from China, Natural Untreated Gem, 24.2 x 12.8 mm

34.7 carat Pear Bloodstone, loose Certified Bloodstone from Madagascar, Natural Untreated Gem, 33.6 x 24.3 mm

5.69 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 8.9 x 8.9 mm

26.63 carat Swiss Blue Topaz, Oval Portuguese-Cut loose Topaz from Brazil, Natural Gem, 19.3 x 13.7 mm

4.83 ct Round Cut Strawberry Quartz, 9 mm From Russia

1.34 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 8.1 x 6.1 mm

9.13 ct Baguette Labradorite, 10.2 x 7.9 mm From Madagascar

0.84 ct Loose Blue Green Sapphire, 5.6 x 4.6 mm Cushion Cut From Madagascar

0.85 ct Yellow Beryl, 7.1 x 7 mm Trillion Cut From Madagascar

1.9 ct Blue Green Apatite, 5.4 x 3.9 mm Oval Cut From Madagascar

3.86 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gem, 14.5 x 9.4 mm

3.3 ct Oval Tiger's Eye, 10.5 x 8.1 mm From Thailand

Gemstone Information

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