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You Selected (131): Oval Shape 18x13 mm Gems Clear All
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ID: 4691391 pcs
thumb image of 6.9ct Oval Cabochon Multicolor Jasper (ID: 469139)
6.89 ct Jasper
17.9 x 12.9 mm
$ 5.03
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ID: 4691451 pcs
thumb image of 8.5ct Oval Cabochon Multicolor Jasper (ID: 469145)
8.46 ct Jasper
17.8 x 12.9 mm
$ 6.18
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ID: 4691411 pcs
thumb image of 8.8ct Oval Cabochon Multicolor Jasper (ID: 469141)
8.77 ct Jasper
17.8 x 12.9 mm
$ 6.40
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ID: 3707672 pcs
thumb image of 21.6ct Oval Cabochon Multicolor Jasper (ID: 370767)
21.58 ct Jasper
17.9 x 13.2 mm
$ 21.58
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ID: 4720271 pcs
thumb image of 12.1ct Oval Cabochon Bluish Green Fluorite (ID: 472027)
12.05 ct Fluorite
18.1 x 12.9 mm
$ 48.20
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ID: 4734201 pcs
thumb image of 12.3ct Oval Facet Gray Blue Sheen Labradorite (ID: 473420)
12.30 ct Labradorite
18.3 x 13.2 mm
$ 24.60
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ID: 4728161 pcs
thumb image of 11.6ct Oval Cabochon Bluish Green Fluorite (ID: 472816)
11.57 ct Fluorite
18.2 x 13.1 mm
$ 46.28
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ID: 4720291 pcs
thumb image of 11.1ct Oval Cabochon Bluish Green Fluorite (ID: 472029)
11.06 ct Fluorite
18 x 13.1 mm
$ 44.24
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ID: 3921381 pcs
thumb image of 15.5ct Oval Cabochon Multicolor Rhodochrosite (ID: 392138)
15.53 ct Rhodochrosite
18.2 x 13.1 mm
$ 31.06
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ID: 4691401 pcs
thumb image of 7.3ct Oval Cabochon Multicolor Jasper (ID: 469140)
7.25 ct Jasper
17.9 x 12.9 mm
$ 5.29
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ID: 3707622 pcs
thumb image of 20.7ct Oval Cabochon Multicolor Jasper (ID: 370762)
20.66 ct Jasper
17.9 x 13.2 mm
$ 20.66
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ID: 4708791 pcs
thumb image of 14.4ct Oval Cabochon Green Aventurine (ID: 470879)
14.44 ct Aventurine
17.8 x 12.9 mm
$ 15.02
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ID: 4734181 pcs
thumb image of 11.8ct Oval Facet Gray Blue Sheen Labradorite (ID: 473418)
11.84 ct Labradorite
18.1 x 13.2 mm
$ 23.68
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ID: 3920551 pcs
thumb image of 15.9ct Oval Cabochon Multicolor Rhodochrosite (ID: 392055)
15.86 ct Rhodochrosite
17.9 x 12.9 mm
$ 31.72
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ID: 3920471 pcs
thumb image of 16.4ct Oval Cabochon Multicolor Rhodochrosite (ID: 392047)
16.43 ct Rhodochrosite
17.9 x 13 mm
$ 32.86
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ID: 3534771 pcs
thumb image of 21ct Oval Cabochon Cream Moonstone (ID: 353477)
20.99 ct Moonstone
17.9 x 13 mm
$ 41.98
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ID: 3711112 pcs
thumb image of 21.7ct Oval Cabochon Multicolor Jasper (ID: 371111)
21.70 ct Jasper
17.8 x 13.2 mm
$ 21.70
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ID: 2735241 pcs
thumb image of 9.7ct Oval Cabochon Greyish White Howlite (ID: 273524)
9.74 ct Howlite
17.8 x 12.9 mm
$ 24.35
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ID: 3707582 pcs
thumb image of 19.1ct Oval Cabochon Multicolor Jasper (ID: 370758)
19.12 ct Jasper
18 x 13.1 mm
$ 19.12
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ID: 4731051 pcs
thumb image of 11.2ct Oval Facet Gray Blue Sheen Labradorite (ID: 473105)
11.20 ct Labradorite
18.2 x 13 mm
$ 22.40
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ID: 1968551 pcs
thumb image of 13.4ct Oval Cabochon Multicolor Ruby-Zoisite (ID: 196855)
13.35 ct Ruby-Zoisite
18.2 x 13 mm
$ 40.05
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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.

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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