New Arrivals Pairs Lots Jewelry Contact
 
: 18 Carat Gems
Shop By

Single

Pairs

Lots

Faceted

Cab

Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (324): 18 Carat Gems Clear All
Sort By:
Compare
ID: 4139681 pcs
thumb image of 18.8ct Oval Cabochon Cream Star Moonstone (ID: 413968)
18.80 ct Star Moonstone
15.6 x 14 mm
$ 75.20
Quantity
Item in Stock
Compare
ID: 4170221 pcs
thumb image of 17.9ct Oval Cabochon Cream Peach Star Moonstone (ID: 417022)
17.93 ct Star Moonstone
16.6 x 15.3 mm
$ 71.72
Quantity
Item in Stock
Compare
ID: 4170301 pcs
thumb image of 17.8ct Oval Cabochon Cream Star Moonstone (ID: 417030)
17.80 ct Star Moonstone
17.7 x 14.8 mm
$ 71.20
Quantity
Item in Stock
Compare
ID: 4529811 pcs
thumb image of 18.6ct Fancy Cabochon Multicolor Ammolite (ID: 452981)
18.58 ct Ammolite
31.3 x 14.7 mm
$ 452.05
Quantity
Item in Stock
Compare
ID: 3933201 pcs
thumb image of 18.6ct Asscher Cut Pink Rose Quartz (ID: 393320)
18.64 ct Rose Quartz
16.1 x 16.1 mm
$ 93.20
Quantity
Item in Stock
Compare
ID: 3936491 pcs
thumb image of 18.5ct Asscher Cut Pink Rose Quartz (ID: 393649)
18.48 ct Rose Quartz
16.5 x 16.3 mm
$ 92.40
Quantity
Item in Stock
Compare
ID: 3448001 pcs
thumb image of 18.4ct Oval Cabochon Pink Rose Quartz (ID: 344800)
18.40 ct Rose Quartz
18.6 x 13.7 mm
$ 24.84
Quantity
Item in Stock
Compare
ID: 3719141 pcs
thumb image of 18.4ct Round Cabochon Mocha Moonstone (ID: 371914)
18.40 ct Moonstone
17.6 mm
$ 82.80
Quantity
Item in Stock
Compare
ID: 3983651 pcs
thumb image of 17.8ct Cushion-Cut Greenish Golden Apatite (ID: 398365)
17.76 ct Apatite
16.1 x 16 mm
$ 845.55
Quantity
Item in Stock
Compare
ID: 3974691 pcs
thumb image of 18ct Asscher Cut Pink Rose Quartz (ID: 397469)
18.01 ct Rose Quartz
15.2 x 15.2 mm
$ 90.05
Quantity
Item in Stock
Compare
ID: 4209831 pcs
thumb image of 17.7ct Oval Cabochon Cream Star Moonstone (ID: 420983)
17.73 ct Star Moonstone
17 x 13.3 mm
$ 53.19
Quantity
Item in Stock
Compare
Show VideoVIDEO
ID: 3102691 pcs
thumb image of 18.7ct Oval Facet Yellow Golden Zircon (ID: 310269)
18.67 ct Zircon
15.9 x 12.5 mm
$ 1540.28
Quantity
Item in Stock
Compare
ID: 4062941 pcs
thumb image of 18.1ct Round Cabochon Golden Green Cat's Eye Apatite (ID: 406294)
18.11 ct Cat's Eye Apatite
15.3 mm
$ 271.65
Quantity
Item in Stock
Compare
ID: 4520011 pcs
thumb image of 17.9ct Oval Facet Lemon Quartz (ID: 452001)
17.85 ct Quartz
16 x 14 mm
$ 26.78
Quantity
Item in Stock
Compare
ID: 4526871 pcs
thumb image of 18.2ct Fancy Cabochon Multicolor Ammolite (ID: 452687)
18.19 ct Ammolite
24.4 x 14.7 mm
$ 442.56
Quantity
Item in Stock
Compare
ID: 4727871 pcs
thumb image of 18.6ct Trillion Cabochon Multicolor Spectrolite (ID: 472787)
18.60 ct Spectrolite
26.8 x 23.3 mm
$ 37.20
Quantity
Item in Stock
Compare
ID: 3632111 pcs
thumb image of 18.9ct Round Cabochon Purple Amethyst (ID: 363211)
18.85 ct Amethyst
17.1 mm
$ 94.25
Quantity
Item in Stock
Compare
ID: 4726271 pcs
thumb image of 18.3ct Carved Leaf Green Moonstone (ID: 472627)
18.26 ct Moonstone
22.1 x 15.1 mm
$ 19.17
Quantity
Item in Stock
Compare
ID: 4741301 pcs
thumb image of 18ct Oval Cabochon Multicolor Spectrolite (ID: 474130)
18.04 ct Spectrolite
29.9 x 18.6 mm
$ 36.08
Quantity
Item in Stock
Compare
ID: 4754601 pcs
thumb image of 18.7ct Oval Cabochon Green Fluorite (ID: 475460)
18.67 ct Fluorite
17.2 x 14.2 mm
$ 74.68
Quantity
Item in Stock
Compare
ID: 3933461 pcs
thumb image of 18.3ct Round Cabochon Violet Amethyst (ID: 393346)
18.32 ct Amethyst
18.9 mm
$ 91.60
Quantity
Item in Stock
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
18 Carat Gems
Buy gems by weight. Shop from our extensive range of beautiful, natural 18-carat gems. Browse the largest selection of natural loose colored gemstones available in 18 carats. Our large gemstone selection includes many popular gem types, such as amethyst, citrine, topaz and turquoise, and lesser-known gems, including ammolite, cat's eye aquamarine and maw-sit-sit. Large, natural 18-carat gems are perfect for making statement jewelry, such as oversized pendants and rings. From here, you can use our filters at the top or on the left-hand side to find gems by gem type, color, shape, cut and so on. For example, select 'moonstone' to see all of our 18-carat moonstone gems. Select 'pink' to shop for 18-carat pink gems. You can also filter by single, pairs, lots, faceted gems or cabochons by using the check boxes at the top.
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