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 -> 9

Gemselect is a good website with a great selection of loose gems for sale. The prices are fairly decent, with the only negative being the cut quality of the gems. This is my go to retailer for gemstones and will continue to be, given that the packages arrive in a timely manner.

Posted By Lunchies in April, 2024

Source: Bizrate

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 -> 10

Great experience! First time buyer

Posted By Todi89 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

Everthing about researching and ordering from Gemselect was easy and uncomplicated. In the past I had payment problems, but your customer rep, Thomas, helped me get everything right. I will continue using Gemselet in the future for these reasons.

Posted By WildwillyfromArizona in August, 2023

Source: Bizrate

Overall Rating -> 8

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

Posted By MI photo in May, 2023

Source: Bizrate

Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

Source: Bizrate

Overall Rating -> 10

Easy to use.

Posted By Hope in March, 2024

Source: Bizrate

Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy 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 -> 10

Easy to use as always and in all steps from opening site to paying.

Posted By Pete in February, 2024

Source: Bizrate

Overall Rating -> 10

Pleasant.

Posted By Mk in November, 2023

Source: Bizrate

Overall Rating -> 9

An it was good.

Posted By Miguel in June, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 7

I feel pretty good so far, pending the delivery of the item ordered.

Posted By Steve in November, 2023

Source: Bizrate

Gemstones A-Z

Buy Marquise Shape 16x8 mm Gems

7.81 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 17.3 x 9.2 mm

10.47 ct Ball Agate, 11 mm From Indonesia

3.29 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 mm

10.34 ct Asscher Cut Smoky Quartz, 10.4 x 10.3 mm From Brazil

0.62 ct Yellow Sphalerite, 4.7 mm Round Cut From Spain

1.1 ct Marquise Cut Peridot, 8.1 x 4.1 mm From China

3 ct Green Agate, 17.7 x 9.2 mm Carved From India

3.85 ct Red Andesine Labradorite, 11.1 x 9.1 mm Oval Cut From Congo

1.37 ct Yellow Beryl, 8.1 x 8.1 mm Trillion Cut From Brazil

1.65 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 20.7 x 3 mm

1.26 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 11.2 x 7.4 mm

32.3 carat Pear Rhodonite, loose Certified Rhodonite from Australia, Natural Untreated Gem, 29.5 x 22.4 mm

0.65 carat Blue Tanzanite, Marquise Cut loose Tanzanite from Tanzania, Natural Gems, 7.2 x 3.6 mm

1.62 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.7 x 6.7 mm

0.71 ct Yellow Beryl, 7 x 6.7 mm Trillion Cut From Madagascar

1.46 carat Pink Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 7.1 mm

2.32 ct Brown Moonstone, 8.4 x 8.2 mm Carved From India

5.11 ct Trillion Concave Cut Smoky Quartz, 10.1 x 10 mm From Brazil

3.1 ct Round Onyx, 7.2 mm From Sri Lanka

9.43 ct Oval Pietersite, 24.8 x 12.2 mm From Namibia

1.2 ct Loose Orange Sapphire, 6.1 x 4 mm Oval Cut From Tanzania

1.81 carat Pear Shape Iolite, loose Certified Iolite from Madagascar, Natural Untreated Gem, 10 x 7.7 mm

2.55 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.2 x 5.1 mm

3.82 ct Diamond Cut Andalusite, 3.7 mm From Brazil

2.6 ct Oval Malachite, 9.8 x 7.1 mm From Congo

10.35 ct Oval Cat's Eye Opal, 18.4 x 13.3 mm From Madagascar

8.17 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 13 x 11 mm

5.67 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 11 x 9.1 mm

5.02 ct Pink Kunzite, 9.5 x 8.3 mm Octagon Cut From Afghanistan

2.59 ct Red Andesine Labradorite, 10 x 7.9 mm Oval Cut From Congo

22.02 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 19.9 x 15.1 mm

2.04 carat Blue Tanzanite, Marquise Cut loose Tanzanite from Tanzania, Natural Gems, 6.8 x 3.5 mm

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