Calibrated 18 x 13 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 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.

Read All

Gemstone Information

Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

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

Posted By Jf in January, 2024

Source: Bizrate

Overall Rating -> 9

Well presented images, clear information, quick and easy check out.

Posted By Mr. Bezel in July, 2023

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

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

I find the website user friendly.

Posted By Becky in August, 2023

Source: Bizrate

Overall Rating -> 10

the searching format was easy to find what i needed. It helped to be able to sort Lowest price to Highest because i wasnt looking to spend too much but i did want an actual stone and not imitation.

Posted By PixelComposer in January, 2024

Source: Bizrate

Overall Rating -> 9

It went well

Posted By Rob in December, 2023

Source: Bizrate

Overall Rating -> 10

Easy to navigate

Posted By G Funk in December, 2023

Source: Bizrate

Overall Rating -> 8

Very easy to find the specific stone I was looking for. I am pleased by both the selection and the price of the stones that are available. The only "bad" thing that I have to say is that the interface of the site is outdated.

Posted By Nick in March, 2024

Source: Bizrate

Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 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

Love Gem select. great gems for the price. Can't beet them

Posted By Apps in September, 2023

Source: Bizrate

Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B in October, 2023

Source: Bizrate

Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 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

Gemstone SHOP

POLICIES

WHO ARE WE?

Gemstone EDUCATION

WE ARE LOCATED AT

183/24-25 Moo 4, Trirat Rd.
T. Chantanimit, A. Muang
Chanthaburi 22000
THAILAND
Phone: 1-800-464-1640
Phone: +66-39601289

STAY IN TOUCH | NEWSLETTER

*You're signing up to receive GemSelect promotional email.

Switch to Mobile Version

Reproduction (text or graphics) without the express written consent of GemSelect.com (SETT Company Ltd.) is strictly prohibited.

973

Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

3.28 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 13.2 x 9.7 mm

3.44 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 10.1 x 8 mm

0.6 ct Loose Purple Sapphire, 4.8 x 3.2 mm Oval Cut From Tanzania

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

3.98 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.1 mm

0.57 ct Loose Yellow Sapphire, 4.6 x 4.6 mm Heart Cut From Tanzania

1.56 carat Yellow Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8.1 x 5.8 mm

0.83 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10 x 4.1 mm

19.53 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18 x 18 mm

1.97 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.2 mm

7.12 ct Green Amazonite, 19.7 x 9.9 mm Marquise Cut From Madagascar

6.74 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 15.7 x 10.5 mm

11.43 ct Oval Serpentine, 23.3 x 14.5 mm From the United States

8.82 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 18 x 13.2 mm

37.32 ct Loose Pencil Cut Jasper, 36.3 x 11.8 mm From Indonesia

3.09 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gems, 5 x 5 mm

4.57 ct Trillion Pietersite, 14.4 x 12.6 mm From Namibia

12.41 carat Bi-color Tourmaline, Carved Fish loose Tourmaline from Mozambique, Natural Untreated Gem, 23.7 x 16.8 mm

7.85 ct Yellow Quartz, 9.5 x 9.5 mm Carved From Brazil

1.76 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.3 x 3.4 mm

3.66 ct Yellow Agate, 11.3 x 9.4 mm Oval Cut From India

1.66 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5 x 5.1 mm

1.14 ct Oval Sillimanite Cat's Eye, 7 x 4.5 mm From Madagascar

7.08 ct Octagon Cut Smoky Quartz, 12.1 x 12 mm From Brazil

34.65 ct Cushion Obsidian, 31.6 x 19.1 mm From Mexico

4.1 ct Oval Prehnite, 10.5 x 9.1 mm From South Africa

0.47 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 6 x 4.3 mm

1.25 ct Purple Spinel, 6.4 x 5.9 mm Cushion Cut From Tanzania

0.95 ct Octagon Cut Peridot, 7 x 5 mm From China

2.68 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 12 x 8.6 mm

27.94 ct White Scolecite, 31.3 x 23.7 mm Oval Cut From South Africa

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

Gemstone Information

Gemstone SHOP

POLICIES

WHO ARE WE?

Gemstone EDUCATION

WE ARE LOCATED AT