Marquise Shape 16 x 8 mm calibrated natural loose gems from 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 marquise shaped facet cut gems, gemstone carvings and cabochons available in 16 mm x 8 mm sizes. For the largest selection of colored gemstones, Shop GemSelect Online.

As a general guideline, when it comes to calibrated gems, they are not usually expected to be cut to exact measurements and specifications. But rather, they're cut with slight variance in size, though the close approximatation in size is not clearly defined, there are general guidelines for what is considered acceptable. Obviously larger and heavy carat weight stones allow more room in size for variance, while smaller stones may leave little to none. This means a large 30mm calibrated gemstone, could actually be closer to 31 millimeters. For this reason, we recommend to always view the exact size in addition to the calibrated size details. The exact size will inform you of the variance you can expect. Some setting styles are more flexible with variance, such as prong settings, while other styles of mountings may need almost an exact size to the fraction of millimeter.

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

Selection ability was straightforward and easy.

Posted By Dave in May, 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 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

The website is easy to navigate and the images are incredible.

Posted By Lindsy in October, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

Posted By T-bone in October, 2023

Source: Bizrate

Overall Rating -> 10

GemSelect has the Best gems. Clear photos and detailed description helps me make the best choice. I have Never been disappointed by thier quality items.

Posted By Rock Hound in July, 2023

Source: Bizrate

Overall Rating -> 10

Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

Posted By Kate in December, 2023

Source: Bizrate

Overall Rating -> 10

Found the stone I wanted which was delivered quickly and met expectations.

Posted By GemGrammy in January, 2024

Source: Bizrate

Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

Posted By Kickbass.2 in May, 2023

Source: Bizrate

Overall Rating -> 10

After having looked at other purchasing sites, this is my first choice.

Posted By MJC in January, 2024

Source: Bizrate

Overall Rating -> 10

I particularly like information about product provided with purchase.

Posted By Dick in May, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

I have used gm select a while ago and was always pleased with the products

Posted By Jaytee in November, 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

Gemstones A-Z

Buy Marquise Shape 16x8 mm Gems

16.07 ct Marquise Hematite, 21.1 x 10.1 mm From Brazil

3.65 ct Oval Buff Top Chalcedony, 11.1 x 9.1 mm From Brazil

10 ct Carved Prehnite, 18.2 x 13.7 mm From South Africa

0.39 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.1 x 4.3 mm

0.51 ct Orange Sphalerite, 4.9 x 4.2 mm Oval Cut From Spain

76.71 ct Drilled Sphere Seraphinite, 14.1 mm From Russia

2.82 carat Trillion Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.9 x 3.9 mm

2.31 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7 x 5.1 mm

22.9 carat Pear Fossil Coral, loose Certified Fossil Coral from Indonesia, Natural Untreated Gems, 21.9 x 15.4 mm

1.55 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 8.2 x 6.3 mm

1.41 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 15 x 3.7 mm

0.45 ct Loose Yellow Sapphire, 5.2 x 3.3 mm Octagon Cut From Tanzania

3.43 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9 mm

1.37 carat Orange Opal, Oval loose Opal from Ethiopia, Natural Gems, 8.1 x 5.9 mm

9.6 carat Pear Coral, loose Certified Coral from Indonesia, Natural Untreated Gem, 18.8 x 13.8 mm

16.68 ct Carved Rose Quartz, 19.8 x 19.8 mm From Brazil

0.53 ct Loose Orange Sapphire, 5.8 x 3.9 mm Oval Cut From Tanzania

3.55 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 11.2 x 11.1 mm

9.44 ct Fancy Pietersite, 20.3 x 9.8 mm From Namibia

4.96 ct Yellow Agate, 11.8 x 10.3 mm Oval Cut From India

4.36 carat Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.5 x 10 mm

2.01 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 4.9 x 3.1 mm

0.5 carat Purple Sapphire, Pear Shape loose Sapphire from Madagascar, Natural Gem, 5.9 x 4.1 mm

6.64 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10.9 x 8.8 mm

8.04 carat Pink Morganite, Pear loose Morganite from Afghanistan, Natural Untreated Gem, 19.7 x 11.8 mm

0.98 ct Oval Cut Peridot, 7.9 x 5.7 mm From China

1.13 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 15.4 x 2.9 mm

66.65 ct Cushion Jasper, 41.3 x 30.6 mm From Indonesia

0.6 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.9 x 4.2 mm

19.86 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 28.6 x 19 mm

4.43 ct Yellow Agate, 10.8 x 10.4 mm Oval Cut From India

1.77 ct Loose Oval Malachite, 8.7 x 6.8 mm From Congo

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