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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (207): Oval Shape 18x13 mm Gems Clear All
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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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12.6ct Oval Cabochon Multicolor Jasper Gem (ID: 488554)
12.56 ct (total 25.12ctw) Jasper
18.1 x 13.1 mm
$ 14.07
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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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8.6ct Oval Cabochon Multicolor Jasper Gem (ID: 469142)
8.56 ct Jasper
18 x 12.9 mm
$ 6.25
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9.6ct Oval Cabochon Green Seraphinite Gem (ID: 328645)
9.56 ct (total 19.12ctw) Seraphinite
18.1 x 13.2 mm
$ 34.42
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13.4ct Oval Rose-Cut Black Spinel Gem (ID: 438290)
13.44 ct (total 26.87ctw) Spinel
17.9 x 13 mm
$ 80.61
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Click for Product Video (462196)
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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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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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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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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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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10.4ct Oval Facet Red Strawberry Quartz Gem (ID: 471617)
10.41 ct Strawberry Quartz
17.5 x 13.3 mm
$ 72.87
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15.6ct Oval Cabochon Pink Rose Quartz Gem (ID: 334244)
15.58 ct Rose Quartz
17.9 x 13.1 mm
$ 19.01
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11.8ct Oval Cabochon Multicolor Jasper Gem (ID: 476748)
11.75 ct Jasper
18 x 13.2 mm
$ 7.52
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2 pcs
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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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10.7ct Oval Cabochon Multicolor Cat's Eye Opal Gem (ID: 494492)
10.73 ct Cat's Eye Opal
18.5 x 12.9 mm
$ 21.46
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8.1ct Oval Cabochon Multicolor Pietersite Gem (ID: 371838)
8.13 ct (total 16.26ctw) Pietersite
18 x 13.2 mm
$ 65.04
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12.3ct Oval Cabochon Multicolor Jasper Gem (ID: 476698)
12.28 ct Jasper
18 x 13.1 mm
$ 7.86
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19.8ct Oval Cabochon Multicolor Ruby-Zoisite Gem (ID: 266276)
19.75 ct Ruby-Zoisite
18.2 x 12.9 mm
$ 54.31
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11.1ct Oval Cabochon Multicolor Jasper Gem (ID: 370763)
11.09 ct (total 22.17ctw) Jasper
18.1 x 13.1 mm
$ 22.17
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Click for Product Video (471788)
10.8ct Oval Cabochon Bluish Green Grandidierite Gem (ID: 471788)
10.79 ct Grandidierite
17.4 x 12.5 mm
$ 3,237.00
Item in Stock
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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
The site had so many different stones and they were very affordably priced
Posted By Manimal in December, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
Good stones and easy to use website
Posted By Wilsondesigns in December, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
All is good
Posted By T in December, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
nice collection of jewels at a fair price
Posted By Bob in December, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
The website is easy to use, and there is a wonderful selection of gem stones to choose from. The prices are reasonable.
Posted By LoveGems in December, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
simple, clear, well organized site
Posted By Lleb in December, 2018
Source: Bizrate
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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