Calibrated 18 x 13 mm Oval Shape Natural Loose Gemstones: GemSelect

Item Description
Stone Type:	Loose Grandidierite
Grandidierite Weight:	17.66 ct Grandidierite
Grandidierite Shape:	Oval Cabochon Grandidierite
Grandidierite Size:	18.2 x 12.8 mm Grandidierite
Grandidierite Color:	Turquoise Grandidierite
Grandidierite Clarity:	Translucent Grandidierite
Grandidierite Origin:	Madagascar Grandidierite
Grandidierite Treatment:	Untreated
Grandidierite Quantity:	1
Grandidierite Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Larimar
Larimar Weight:	11.26 ct Larimar
Larimar Shape:	Oval Cabochon Larimar
Larimar Size:	18.1 x 13.2 mm Larimar
Larimar Color:	Blue Green Larimar
Larimar Clarity:	Opaque Larimar
Larimar Origin:	Dominican Republic Larimar
Larimar Treatment:	Untreated
Larimar Quantity:	1
Larimar Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Larimar
Larimar Weight:	11.86 ct Larimar
Larimar Shape:	Oval Cabochon Larimar
Larimar Size:	18 x 13.1 mm Larimar
Larimar Color:	Light Greenish Blue Larimar
Larimar Clarity:	Opaque Larimar
Larimar Origin:	Dominican Republic Larimar
Larimar Treatment:	Untreated
Larimar Quantity:	1
Larimar Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Larimar
Larimar Weight:	10.72 ct Larimar
Larimar Shape:	Oval Cabochon Larimar
Larimar Size:	17.9 x 13.1 mm Larimar
Larimar Color:	Light Greenish Blue Larimar
Larimar Clarity:	Opaque Larimar
Larimar Origin:	Dominican Republic Larimar
Larimar Treatment:	Untreated
Larimar Quantity:	1
Larimar Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Grandidierite
Grandidierite Weight:	10.79 ct Grandidierite
Grandidierite Shape:	Oval Cabochon Grandidierite
Grandidierite Size:	17.4 x 12.5 mm Grandidierite
Grandidierite Color:	Greenish Blue Grandidierite
Grandidierite Clarity:	Translucent Grandidierite
Grandidierite Origin:	Madagascar Grandidierite
Grandidierite Treatment:	Untreated
Grandidierite Quantity:	1
Grandidierite Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Larimar
Larimar Weight:	12.29 ct Larimar
Larimar Shape:	Oval Cabochon Larimar
Larimar Size:	18.1 x 13.2 mm Larimar
Larimar Color:	Light Greenish Blue Larimar
Larimar Clarity:	Opaque Larimar
Larimar Origin:	Dominican Republic Larimar
Larimar Treatment:	Untreated
Larimar Quantity:	1
Larimar Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Larimar
Larimar Weight:	10.67 ct Larimar
Larimar Shape:	Oval Cabochon Larimar
Larimar Size:	18.6 x 13.1 mm Larimar
Larimar Color:	Blue Green Larimar
Larimar Clarity:	Opaque Larimar
Larimar Origin:	Dominican Republic Larimar
Larimar Treatment:	Untreated
Larimar Quantity:	1
Larimar Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Larimar
Larimar Weight:	11.23 ct Larimar
Larimar Shape:	Oval Cabochon Larimar
Larimar Size:	18.1 x 13.2 mm Larimar
Larimar Color:	Blue Green Larimar
Larimar Clarity:	Opaque Larimar
Larimar Origin:	Dominican Republic Larimar
Larimar Treatment:	Untreated
Larimar Quantity:	1
Larimar Certificate:	GemSelect
Product Description:

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 18 x13 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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Gemstone Information

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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

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Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

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Overall Rating -> 9

Good interaction with site

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Overall Rating -> 10

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Overall Rating -> 10

I love GemSelect, photos and details are great.

Posted By #1 in February, 2024

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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.

Posted By Kittypie070 in April, 2024

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Overall Rating -> 10

Posted By ChiChi in January, 2024

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Overall Rating -> 10

LOVE YOU GUYS. YOU CARRY EVERY GEMSTON I WANT. THE PRICE IS GREAT,THE PRODUCT IS OUTSTANDING,AND THE SERVICE CANT BE BEET.

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Overall Rating -> 9

Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

Posted By Bob in November, 2023

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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).

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Overall Rating -> 10

I find the website user friendly.

Posted By Becky in August, 2023

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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 !!

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Overall Rating -> 10

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Overall Rating -> 9

Overall good, shipping prices just seem a little on the high side.

Posted By Steve in August, 2023

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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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Selected Gemstones

Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

17.66 ct Blue Green Grandidierite, 18.2 x 12.8 mm Oval Cut From Madagascar

Natural Grandidierite, Qty: 1 pc | 17.66 carat weight Grandidierite

11.26 ct Oval Larimar, 18.1 x 13.2 mm From the Dominican Republic

Natural Larimar, Qty: 1 pc | 11.26 carat weight Larimar

11.86 ct Oval Larimar, 18 x 13.1 mm From the Dominican Republic

Natural Larimar, Qty: 1 pc | 11.86 carat weight Larimar

10.72 ct Oval Larimar, 17.9 x 13.1 mm From the Dominican Republic

Natural Larimar, Qty: 1 pc | 10.72 carat weight Larimar

10.79 ct Blue Green Grandidierite, 17.4 x 12.5 mm Oval Cut From Madagascar

Natural Grandidierite, Qty: 1 pc | 10.79 carat weight Grandidierite

12.29 ct Oval Larimar, 18.1 x 13.2 mm From the Dominican Republic

Natural Larimar, Qty: 1 pc | 12.29 carat weight Larimar

10.67 ct Oval Larimar, 18.6 x 13.1 mm From the Dominican Republic

Natural Larimar, Qty: 1 pc | 10.67 carat weight Larimar

11.23 ct Oval Larimar, 18.1 x 13.2 mm From the Dominican Republic

Natural Larimar, Qty: 1 pc | 11.23 carat weight Larimar

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