Jewelry New Arrivals Pairs Lots 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: 3488861 pcs
thumb image of 18.9ct Oval Cabochon Pink Rose Quartz (ID: 348886)
18.91 ct Rose Quartz
17.3 x 14.3 mm
$ 24.58
Quantity
Item in Stock
Compare
ID: 4059361 pcs
thumb image of 17.6ct Oval Cabochon Multicolor Tiger's Eye Matrix (ID: 405936)
17.57 ct Tiger's Eye Matrix
20.1 x 15.2 mm
$ 18.80
Quantity
Item in Stock
Compare
ID: 4436401 pcs
thumb image of 18.3ct Cushion-Cut Yellow Golden Citrine (ID: 443640)
18.33 ct Citrine
14.9 x 14.8 mm
$ 91.65
Quantity
Item in Stock
Compare
ID: 4202891 pcs
thumb image of 18.1ct Oval Cabochon Green Jadeite (ID: 420289)
18.07 ct Jadeite
21.1 x 15.3 mm
$ 36.14
Quantity
Item in Stock
Compare
ID: 3329181 pcs
thumb image of 18.9ct Oval Cabochon Pink Rose Quartz (ID: 332918)
18.94 ct Rose Quartz
16.8 x 15.5 mm
$ 22.73
Quantity
Item in Stock
Compare
ID: 4338371 pcs
thumb image of 17.7ct Oval Cabochon Gold Sheen Obsidian (ID: 433837)
17.66 ct Obsidian
21.7 x 15.9 mm
$ 17.66
Quantity
Item in Stock
Compare
ID: 3704581 pcs
thumb image of 18.2ct Oval Cabochon Multicolor Jasper (ID: 370458)
18.17 ct Jasper
20 x 15.2 mm
$ 27.26
Quantity
Item in Stock
Compare
ID: 4473811 pcs
thumb image of 18.9ct Fancy Cabochon Blue Larimar (ID: 447381)
18.86 ct Larimar
27.4 x 19.5 mm
$ 61.30
Quantity
Item in Stock
Compare
ID: 3332261 pcs
thumb image of 17.6ct Cushion-Cut Bi-Color Ametrine (ID: 333226)
17.58 ct Ametrine
19.6 x 15.9 mm
$ 175.80
Quantity
Item in Stock
Compare
ID: 3958031 pcs
thumb image of 18.2ct Pear Facet Swiss Blue Topaz (ID: 395803)
18.15 ct Topaz
17.8 x 14.5 mm
$ 115.43
Quantity
Item in Stock
Compare
ID: 3635391 pcs
thumb image of 17.5ct Octagon / Scissor Cut Black Tourmaline (ID: 363539)
17.54 ct Tourmaline
19.9 x 11.8 mm
$ 65.77
Quantity
Item in Stock
Compare
ID: 3287581 pcs
thumb image of 18ct Oval Cabochon Pink Rose Quartz (ID: 328758)
18.02 ct Rose Quartz
18.1 x 13.1 mm
$ 21.62
Quantity
Item in Stock
Compare
ID: 4535961 pcs
thumb image of 18.2ct Fancy Cabochon Multicolor Ammolite (ID: 453596)
18.15 ct Ammolite
30.3 x 16.4 mm
$ 671.55
Quantity
Item in Stock
Compare
ID: 3483541 pcs
thumb image of 18.9ct Oval Cabochon Grayish Blue Pietersite (ID: 348354)
18.91 ct Pietersite
29.5 x 22.1 mm
$ 75.64
Quantity
Item in Stock
Compare
ID: 2704591 pcs
thumb image of 18.4ct Pear Cabochon Multi Rose Pink Rhodochrosite (ID: 270459)
18.43 ct Rhodochrosite
23.8 x 14.9 mm
$ 46.08
Quantity
Item in Stock
Compare
ID: 4485521 pcs
thumb image of 18.4ct Oval Cabochon Violet Charoite (ID: 448552)
18.41 ct Charoite
25.3 x 18.2 mm
$ 55.23
Quantity
Item in Stock
Compare
ID: 4488171 pcs
thumb image of 18.7ct Marquise Cabochon Colorless Golden Rutile Quartz (ID: 448817)
18.68 ct Rutile Quartz
30 x 15.1 mm
$ 46.70
Quantity
Item in Stock
Compare
ID: 4139081 pcs
thumb image of 17.9ct Oval Facet Violet-Blue Color-Change Fluorite (ID: 413908)
17.94 ct Color-Change Fluorite
19.9 x 14.9 mm
$ 358.80
Quantity
Item in Stock
Compare
ID: 3602351 pcs
thumb image of 18.6ct Oval Cabochon Mocha Orange Moonstone (ID: 360235)
18.61 ct Moonstone
21.9 x 16.2 mm
$ 37.22
Quantity
Item in Stock
Compare
ID: 3488951 pcs
thumb image of 18.2ct Oval Cabochon Pink Rose Quartz (ID: 348895)
18.22 ct Rose Quartz
18.2 x 15.4 mm
$ 23.69
Quantity
Item in Stock
Compare
ID: 4338761 pcs
thumb image of 17.8ct Oval Cabochon Blue Larimar (ID: 433876)
17.78 ct Larimar
31.8 x 19.1 mm
$ 71.12
Quantity
Item in Stock
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18 Carat Gems
Buy gems by price. 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

Reorder Items

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

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