• English speaking customer support only

    Toll Free - USA & Canada only:
    1-800-464-1640

    International:
    +66-39303404

  • Change Language
  • USD
Buy Customized Gemstone Lots
Shop By

Single

By Piece

Pairs

Lots

Faceted

Cab

Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (209): Oval Shape 18x13 mm Gems Clear All
Sort By:
Click for Details
Compare
1 pc
Add to Cart
10.1ct Oval Facet Yellow Golden Citrine Gem (ID: 504835)
10.09 ct Citrine
18 x 13 mm
$ 70.63
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Click for Product Video (412591)
14ct Oval Facet Green Tourmaline Gem (ID: 412591)
14.01 ct Tourmaline
18.5 x 13.3 mm
$ 770.55
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
16.9ct Oval Cabochon Pink Rose Quartz Gem (ID: 364378)
16.91 ct Rose Quartz
17.8 x 13.3 mm
$ 25.36
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
11.7ct Oval Cabochon Light Green Jadeite Gem (ID: 382693)
11.67 ct Jadeite
18.2 x 13.4 mm
$ 17.50
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
9.3ct Oval Cabochon Multicolor Jasper Gem (ID: 370761)
9.32 ct (total 18.63ctw) Jasper
18 x 13.2 mm
$ 18.63
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
14.2ct Oval Facet Red Strawberry Quartz Gem (ID: 472444)
14.16 ct Strawberry Quartz
18.2 x 13.2 mm
$ 99.12
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
12.6ct Oval Cabochon Multicolor Jasper Gem (ID: 488554)
12.56 ct (total 25.12ctw) Jasper
18.1 x 13.1 mm
$ 14.07
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
8.6ct Oval Cabochon Multicolor Jasper Gem (ID: 469142)
8.56 ct Jasper
18 x 12.9 mm
$ 6.25
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
9.6ct Oval Cabochon Green Seraphinite Gem (ID: 328645)
9.56 ct (total 19.12ctw) Seraphinite
18.1 x 13.2 mm
$ 34.42
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
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
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
15.3ct Carved Oval Cabochon Green Prehnite Gem (ID: 474448)
15.27 ct Prehnite
17.7 x 13.3 mm
$ 32.07
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
13.6ct Oval Facet Red Strawberry Quartz Gem (ID: 472287)
13.60 ct Strawberry Quartz
17.8 x 13.4 mm
$ 95.20
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
9.9ct Oval Cabochon Multicolor Jasper Gem (ID: 364129)
9.89 ct (total 19.77ctw) Jasper
17.9 x 13.1 mm
$ 39.54
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
10.3ct Oval Cabochon Multicolor Jasper Gem (ID: 370762)
10.33 ct (total 20.66ctw) Jasper
17.9 x 13.2 mm
$ 20.66
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
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
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
10.9ct Oval Cabochon Multicolor Jasper Gem (ID: 371111)
10.85 ct (total 21.70ctw) Jasper
17.8 x 13.2 mm
$ 21.70
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
12.5ct Oval Rose-Cut Black Spinel Gem (ID: 438295)
12.54 ct (total 25.08ctw) Spinel
18.2 x 13.1 mm
$ 75.24
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Click for Product Video (333920)
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
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
10.8ct Oval Cabochon Multicolor Jasper Gem (ID: 370756)
10.81 ct (total 21.62ctw) Jasper
18 x 13 mm
$ 21.62
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
12.1ct Oval Sugarloaf Cabochon Bluish Green Fluorite Gem (ID: 472027)
12.05 ct Fluorite
18.1 x 12.9 mm
$ 12.05
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
13.4ct Oval Facet Red Strawberry Quartz Gem (ID: 472335)
13.38 ct Strawberry Quartz
17.4 x 13.2 mm
$ 93.66
Item in Stock
1 2 3 4 5 6 7 8 9 10
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 -> 9 star ratings
My selection was made quickly and efficiently.
Posted By JimC in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
GemSelect has a great selection at reasonable prices. Gemstones are always as beautiful as pictured.
Posted By GemLover in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Colors and qualities of gems are very well represented online. Easy to use website. Great selections!
Posted By in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
This was my second purchase from GemSelect and definitely won’t be my last! They have a very wide variety of gems and you can always find what you are looking for with ease and the prices are very good.
Posted By Jill in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Loved the wide selection of product
Posted By Miki in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
finally bought the last rock to complete my ring idea; needed another white one after giving the big diamond to my daughter. a diamond that size is out of my retired-school-teacher budget, so i bought a white zircon. went back to the same place that i got my loose sapphire-- great selection, good prices, good delivery!
Posted By Ptcmom in November, 2018
Source: Bizrate
Popular Gemstones
All Gemstones (144)
A B C D E F G H I J K L M O P Q R S T V Z
English speaking customer support only

Toll Free - USA & Canada only:
1-800-464-1640

International:
+66-39303404

Save Money
No shipping Fees for Additional Items!
$6.99 Worldwide Shipping

Update Translation
 
Current Value
New Value

Creating Account...

Close window to continue

Facebook did not provide your email to login.

Please allow Facebook to provide your email or sign up an account with GemSelect.

GemSelect Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
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