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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (174): Oval Shape 18x13 mm Gems Clear All
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10.6ct Oval Cabochon Multicolor Coral Gem (ID: 492200)
10.62 ct Coral
17.8 x 12.7 mm
$ 30.27
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2 pcs
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9.3ct Oval Cabochon Multicolor Jasper Gem (ID: 370761)
9.32 ct (total 18.63ctw) Jasper
18 x 13.2 mm
$ 18.63
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14ct Oval Facet Green Tourmaline Gem (ID: 412591)
14.01 ct Tourmaline
18.5 x 13.3 mm
$ 770.55
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10.8ct Oval Cabochon Multicolor Jasper Gem (ID: 488292)
10.81 ct Jasper
18.1 x 12.9 mm
$ 6.05
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2 pcs
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10.9ct Oval Cabochon Multicolor Jasper Gem (ID: 371111)
10.85 ct (total 21.70ctw) Jasper
17.8 x 13.2 mm
$ 21.70
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14.2ct Oval Cabochon Golden-Brown Star Sunstone Gem (ID: 471219)
14.23 ct Star Sunstone
18 x 13.2 mm
$ 28.46
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9.7ct Oval Cabochon Multicolor Opal Gem (ID: 462196)
9.66 ct Opal
18.4 x 13.5 mm
$ 388.91
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8.6ct Oval Cabochon Multicolor Jasper Gem (ID: 469142)
8.56 ct Jasper
18 x 12.9 mm
$ 6.25
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13.6ct Oval Facet Red Strawberry Quartz Gem (ID: 472287)
13.60 ct Strawberry Quartz
17.8 x 13.4 mm
$ 95.20
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11.8ct Oval Cabochon Multicolor Jasper Gem (ID: 488556)
11.80 ct (total 23.60ctw) Jasper
18.2 x 13 mm
$ 13.22
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13.4ct Oval Facet Red Strawberry Quartz Gem (ID: 472335)
13.38 ct Strawberry Quartz
17.4 x 13.2 mm
$ 93.66
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9.8ct Oval Cabochon Multicolor Jasper Gem (ID: 370766)
9.82 ct (total 19.64ctw) Jasper
18.1 x 13.1 mm
$ 19.64
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19.7ct Oval Cabochon Blue-Green Cat's Eye Aquamarine Gem (ID: 333920)
19.65 ct Cat's Eye Aquamarine
17.5 x 13.3 mm
$ 353.70
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7.9ct Oval Cabochon Multicolor Jasper Gem (ID: 364110)
7.89 ct Jasper
18 x 13 mm
$ 15.78
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13.3ct Oval Cabochon Light Blue Aquamarine Gem (ID: 469725)
13.33 ct Aquamarine
17.8 x 13.1 mm
$ 112.11
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17.7ct Oval Cabochon Pink Rose Quartz Gem (ID: 334299)
17.68 ct Rose Quartz
18.3 x 13.2 mm
$ 21.57
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7.7ct Oval Cabochon Multicolor Pietersite Gem (ID: 347717)
7.68 ct Pietersite
18.1 x 13.2 mm
$ 30.72
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10.8ct Oval Cabochon Multicolor Jasper Gem (ID: 370756)
10.81 ct (total 21.62ctw) Jasper
18 x 13 mm
$ 21.62
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10.3ct Oval Cabochon Multicolor Fossil Coral Gem (ID: 482204)
10.27 ct (total 20.54ctw) Fossil Coral
18.1 x 12.8 mm
$ 20.13
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12.3ct Oval Rose-Cut Black Spinel Gem (ID: 438289)
12.29 ct (total 24.58ctw) Spinel
18.1 x 12.7 mm
$ 73.74
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12.1ct Oval Sugarloaf Cabochon Bluish Green Fluorite Gem (ID: 472027)
12.05 ct Fluorite
18.1 x 12.9 mm
$ 12.05
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Oval Shape 18x13 mm Gems
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.

Certified Customer Reviews
Overall Rating -> 10 star ratings
I have been using GemSelect for at lest five years and I have no complaints!
Posted By in October, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
This site always has beautiful stones to choose from and you will get the actual gem that is pictured. The shipping is fast and reasonably priced.
Posted By CAC in October, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I have not gotten my gems, but when i do i will be very happy, yet i did not like you had to pay $15 extra for faster shipping
Posted By Jack in October, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I love GemSelect, personally. I browse their site almost daily to see all the new stones available. Their selection is pretty amazing. The quality isn't always the highest and the cut of the stones isn't always perfect. But for the price, and if you look hard enough, you can find a real gem, so to speak.
Posted By Patrick in September, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I would recommend to a friend because of the quality of the products purchased. The gemstone quality is very high and the gems purchased are beautiful. Any friends interested in having custom jewelry made would definitely be recommended to the site. Also, every shipment is handled with care and I am very pleased with that.
Posted By Isaiah in September, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
Gem Select has an excellent selection of gemstones, including some rare ones. Prices are as expected.
Posted By Mike in September, 2018
Source: Bizrate
Popular Gemstones
All Gemstones (141)
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart