18 mm Round Gemstones: Natural Rubies, Sapphires, Garnets, Emeralds, Tourmalines, Amethysts in 18mm Round
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Explore our stunning collection of 18 mm round gemstones, featuring a variety of 18 mm gems and 18 mm stones with exceptional carat weight. Whether you're looking for round garnets, round sapphires, round rubies, or round emeralds, our 18 mm round cuts offer unparalleled brilliance and beauty, perfect for all your fine jewelry creations. 2. Dive into the world of 18 mm round gemstones, where you'll find a range of 18 mm round stones, gems 18 mm, and expertly crafted round brilliant cuts. Our collection includes premium 18 mm round diamonds, round sapphires, round rubies, and round emeralds, all designed to deliver stunning clarity, color, and carat weight for your jewelry collection. |
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Bi-color
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Black
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Blue 18 mm Round Gemstones
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Brown 18 mm Round Gemstones
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Golden
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Gray 18 mm Round Gemstones
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Green 18 mm Round Gemstones
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Multicolor 18 mm Round Gemstones
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Orange
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Pink
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Purple
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Red
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Turquoise
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Violet 18 mm Round Gemstones
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White 18 mm Round Gemstones
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Yellow 18 mm Round Gemstones
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
| ID: | 503802 |
| Weight: | 17.43ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 69.02 |
| Item in Stock | |
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| ID: | 671202 |
| Weight: | 15.26ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 32.81 |
| Item in Stock | |
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| ID: | 714392 |
| Weight: | 27.45ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 247.05 |
| Item in Stock | |
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| ID: | 625471 |
| Weight: | 16.42ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 86.90 |
| Item in Stock | |
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| ID: | 598911 |
| Weight: | 16.29ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 78.05 |
| Item in Stock | |
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| ID: | 602194 |
| Weight: | 15.94ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 77.44 |
| Item in Stock | |
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| ID: | 406641 |
| Weight: | 24.65ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 59.16 |
| Item in Stock | |
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| ID: | 711137 |
| Weight: | 18.58ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 156.07 |
| Item in Stock | |
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| ID: | 711143 |
| Weight: | 19.78ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 166.15 |
| Item in Stock | |
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| ID: | 711030 |
| Weight: | 18.76ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 157.58 |
| Item in Stock | |
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| ID: | 712395 |
| Weight: | 18.88ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 158.59 |
| Item in Stock | |
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| ID: | 491702 |
| Weight: | 48.88ct (total) |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 2 pcs |
| Price: | $ 57.42 |
| Item in Stock | |
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| ID: | 391643 |
| Weight: | 34.12ct (total) |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 2 pcs |
| Price: | $ 96.84 |
| Item in Stock | |
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| ID: | 427977 |
| Weight: | 15.19ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 70.18 |
| Item in Stock | |
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| ID: | 711630 |
| Weight: | 18.89ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 158.68 |
| Item in Stock | |
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| ID: | 712831 |
| Weight: | 18.67ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 156.83 |
| Item in Stock | |
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| ID: | 564824 |
| Weight: | 13.11ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 51.91 |
| Item in Stock | |
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| ID: | 491705 |
| Weight: | 48.28ct (total) |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 2 pcs |
| Price: | $ 56.72 |
| Item in Stock | |
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| ID: | 602847 |
| Weight: | 14.85ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 71.94 |
| Item in Stock | |
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| ID: | 712390 |
| Weight: | 19.21ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VS |
| Content: | 1 pc |
| Price: | $ 161.36 |
| Item in Stock | |
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| ID: | 712391 |
| Weight: | 18.19ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VS |
| Content: | 1 pc |
| Price: | $ 152.80 |
| Item in Stock | |
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| ID: | 491707 |
| Weight: | 58.13ct (total) |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 2 pcs |
| Price: | $ 68.29 |
| Item in Stock | |
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| ID: | 717023 |
| Weight: | 15.97ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 30.47 |
| Item in Stock | |
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| ID: | 711029 |
| Weight: | 19.14ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 160.78 |
| Item in Stock | |
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| ID: | 391653 |
| Weight: | 29.41ct (total) |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 2 pcs |
| Price: | $ 83.46 |
| Item in Stock | |
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| ID: | 711023 |
| Weight: | 19.39ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 162.88 |
| Item in Stock | |
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| ID: | 658420 |
| Weight: | 10.45ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 37.62 |
| Item in Stock | |
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| ID: | 711140 |
| Weight: | 18.92ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 158.93 |
| Item in Stock | |
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| ID: | 712389 |
| Weight: | 19.60ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 164.64 |
| Item in Stock | |
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| ID: | 712833 |
| Weight: | 19.88ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 166.99 |
| Item in Stock | |
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| ID: | 601427 |
| Weight: | 15.46ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 75.10 |
| Item in Stock | |
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| ID: | 712836 |
| Weight: | 19.33ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 162.37 |
| Item in Stock | |
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| ID: | 711146 |
| Weight: | 18.08ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 151.87 |
| Item in Stock | |
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| ID: | 406635 |
| Weight: | 23.98ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 63.31 |
| Item in Stock | |
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| ID: | 427976 |
| Weight: | 15.09ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 69.72 |
| Item in Stock | |
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| ID: | 406636 |
| Weight: | 21.98ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 58.03 |
| Item in Stock | |
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| ID: | 712832 |
| Weight: | 19.76ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 165.98 |
| Item in Stock | |
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| ID: | 650679 |
| Weight: | 11.67ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 32.90 |
| Item in Stock | |
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| ID: | 371914 |
| Weight: | 18.40ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 109.30 |
| Item in Stock | |
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| ID: | 721363 |
| Weight: | 24.27ct |
| Size: | 19 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 29.12 |
| Item in Stock | |
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| ID: | 602734 |
| Weight: | 14.35ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 69.52 |
| Item in Stock | |
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| ID: | 687678 |
| Weight: | 12.37ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 36.52 |
| Item in Stock | |
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| ID: | 669080 |
| Weight: | 17.63ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Transparent |
| Content: | 1 pc |
| Price: | $ 380.81 |
| Item in Stock | |
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| ID: | 552037 |
| Weight: | 11.91ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 31.44 |
| Item in Stock | |
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| ID: | 406640 |
| Weight: | 23.89ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 63.07 |
| Item in Stock | |
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| ID: | 711022 |
| Weight: | 17.29ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 145.24 |
| Item in Stock | |
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| ID: | 717165 |
| Weight: | 13.25ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 25.28 |
| Item in Stock | |
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FAQs
What does "18 mm" mean when referring to gemstones?
"18 mm" indicates the diameter of a gemstone, defining the size of pieces such as 18 mm gems, 18 mm gemstones, or 18 mm round gemstones. This measurement is crucial for understanding the overall impact and carat weight of the stone.
How do 18 mm round cuts enhance a gemstone's beauty?
18 mm round cuts, especially those in a Round brilliant cut style, maximize a gemstone’s sparkle and light performance. These precise cuts are applied to 18 mm round stones, gemstone 18 mm round pieces, and gemstones 18 mm round items, ensuring exceptional brilliance.
What types of stones are available in the 18 mm category?
Our collection includes a variety of options such as 18 mm gems, 18 mm gemstones, and 18 mm round gemstones. You can find round 18 mm gemstones, round 18 mm stones, and round gemstones 18 mm, which include stunning examples like round Diamond, round Sapphire, round Ruby, and round Emerald.
How does carat weight relate to an 18 mm diameter gemstone?
The carat weight of a gemstone is closely linked to its physical size, such as an 18 mm diameter. Larger 18 mm stones and 18 mm round gemstones typically carry a higher carat weight, reflecting their size and overall value.
What role does Gemology play in our collection?
Gemology ensures that each piece, whether it’s a gemstone 18 mm round or gemstones 18 mm round, meets strict quality standards. Experts evaluate factors like the Round brilliant cut and Carat weight to certify the beauty and authenticity of 18 mm round stones, gems 18 mm, and similar pieces.
What do the terms "gems round" and "gems stones" imply in this context?
The terms gems round and gems stones refer to any gemstone that has been expertly cut into a round shape. In our collection, these terms emphasize the focus on 18 mm round designs and include items like gemstone 18 mm round, gemstones 18 mm round, and round 18 mm gemstones.
GemSelect Certified Store Reviews
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 9 ![]()
I am very pleased with the ways you can filter your searches on this site, finding exactly what I want with little knowledge of what I am looking for is surprisingly easy!
Overall Rating -> 10 ![]()
the selection is good as are the prices
Overall Rating -> 10 ![]()
looked at pink stones and at sapphires bought some sapphires. I love looking and collecting gemstones..
Overall Rating -> 10 ![]()
I was looking for a site with every type of gem I could want for setting in luxury blades and assumed I would need to look outside the US, but GemSelect made it easy to get everything I wanted without leaving the house! Wide enough selection that I do not feel the need to look elsewhere and pricing the same.
Overall Rating -> 10 ![]()
Love how easy the site is to use. Really love that the pictures are of actual product.
Overall Rating -> 10 ![]()
Absolutely love the website, selection and products. Can you guys add a gemstones with inclusions tab. I like those it'd be nice to have them all in one place but i do understand it would be alot of work to go through and categorize them. Thank you anyways
