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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (166): Oval Shape 18x13 mm Gems Clear All
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ID: 3712331 pcs
thumb image of 10.4ct Oval Cabochon Multicolor Jasper (ID: 371233)
10.40 ct Jasper
17.9 x 13.1 mm
$ 10.40
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ID: 3286281 pcs
thumb image of 19.6ct Oval Cabochon Pink Rose Quartz (ID: 328628)
19.62 ct Rose Quartz
18.1 x 13 mm
$ 23.54
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ID: 4495481 pcs
thumb image of 12.1ct Oval Cabochon Orange Red Carnelian (ID: 449548)
12.14 ct Carnelian
18 x 13 mm
$ 60.70
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ID: 3708371 pcs
thumb image of 12.3ct Oval Cabochon Multicolor Jasper (ID: 370837)
12.30 ct Jasper
18.2 x 13.2 mm
$ 12.30
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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: 3226871 pcs
thumb image of 9.5ct Oval Cabochon Greyish White Howlite (ID: 322687)
9.53 ct Howlite
17.8 x 13.1 mm
$ 23.82
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ID: 3224411 pcs
thumb image of 9.4ct Oval Cabochon Greyish White Howlite (ID: 322441)
9.40 ct Howlite
18 x 13 mm
$ 23.50
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ID: 3224361 pcs
thumb image of 9.2ct Oval Cabochon Greyish White Howlite (ID: 322436)
9.15 ct Howlite
18.1 x 13.1 mm
$ 22.88
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ID: 2735181 pcs
thumb image of 8.8ct Oval Cabochon Greyish White Howlite (ID: 273518)
8.82 ct Howlite
18.3 x 13.2 mm
$ 22.05
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ID: 3707592 pcs
thumb image of 20.6ct Oval Cabochon Multicolor Jasper (ID: 370759)
20.64 ct Jasper
18 x 13.1 mm
$ 20.64
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ID: 4564001 pcs
thumb image of 15.7ct Oval Cabochon Multicolor Pietersite (ID: 456400)
15.74 ct Pietersite
18.2 x 12.9 mm
$ 36.67
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ID: 3497721 pcs
thumb image of 9.2ct Oval Cabochon Violet Charoite (ID: 349772)
9.17 ct Charoite
18.1 x 13.1 mm
$ 27.51
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ID: 3707602 pcs
thumb image of 23.5ct Oval Cabochon Multicolor Jasper (ID: 370760)
23.48 ct Jasper
18 x 13.2 mm
$ 23.48
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ID: 3920651 pcs
thumb image of 13.8ct Oval Cabochon Multicolor Rhodochrosite (ID: 392065)
13.76 ct Rhodochrosite
17.7 x 12.8 mm
$ 27.52
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ID: 3707632 pcs
thumb image of 22.2ct Oval Cabochon Multicolor Jasper (ID: 370763)
22.17 ct Jasper
18.1 x 13.1 mm
$ 22.17
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ID: 4382942 pcs
thumb image of 26.2ct Oval Rose-Cut Black Spinel (ID: 438294)
26.23 ct Spinel
18.2 x 13.1 mm
$ 78.69
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ID: 2662761 pcs
thumb image of 19.8ct Oval Cabochon Multicolor Ruby-Zoisite (ID: 266276)
19.75 ct Ruby-Zoisite
18.2 x 12.9 mm
$ 54.31
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ID: 3707652 pcs
thumb image of 25ct Oval Cabochon Multicolor Jasper (ID: 370765)
25.02 ct Jasper
18 x 13.1 mm
$ 25.02
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ID: 3286271 pcs
thumb image of 18.4ct Oval Cabochon Pink Rose Quartz (ID: 328627)
18.41 ct Rose Quartz
18 x 13.2 mm
$ 22.09
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ID: 3913061 pcs
thumb image of 14.3ct Oval Cabochon Violet Amethyst (ID: 391306)
14.28 ct Amethyst
18 x 13.1 mm
$ 99.96
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ID: 3844511 pcs
thumb image of 12.6ct Oval Cabochon Lavender Jadeite (ID: 384451)
12.64 ct Jadeite
18.1 x 12.8 mm
$ 88.48
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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