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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| 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: | 503802 |
| Weight: | 17.43ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 69.02 |
| 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: | 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: | 671202 |
| Weight: | 15.26ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 32.81 |
| 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: | 658420 |
| Weight: | 10.45ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 37.62 |
| 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: | 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: | 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: | 406636 |
| Weight: | 21.98ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 58.03 |
| 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: | 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: | 711140 |
| Weight: | 18.92ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 158.93 |
| 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: | 602847 |
| Weight: | 14.85ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 71.94 |
| 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: | 371914 |
| Weight: | 18.40ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 109.30 |
| 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: | 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: | 712391 |
| Weight: | 18.19ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VS |
| Content: | 1 pc |
| Price: | $ 152.80 |
| 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: | 711137 |
| Weight: | 18.58ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 156.07 |
| 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: | 711143 |
| Weight: | 19.78ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 166.15 |
| 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: | 712395 |
| Weight: | 18.88ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 158.59 |
| 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: | 711023 |
| Weight: | 19.39ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 162.88 |
| 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: | 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: | 650679 |
| Weight: | 11.67ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 32.90 |
| 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 | |
| More Options & Item Details | |
| 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: | 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: | 406640 |
| Weight: | 23.89ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 63.07 |
| 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: | 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: | 552037 |
| Weight: | 11.91ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 31.44 |
| 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 | |
| More Options & Item Details | |
| 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: | 712389 |
| Weight: | 19.60ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 164.64 |
| Item in Stock | |
| More Options & Item Details | |
| ID: | 601427 |
| Weight: | 15.46ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS-VS |
| Content: | 1 pc |
| Price: | $ 75.10 |
| Item in Stock | |
| More Options & Item Details | |
| ID: | 711030 |
| Weight: | 18.76ct |
| Size: | 18 mm (calibrated) |
| Clarity: | VVS |
| Content: | 1 pc |
| Price: | $ 157.58 |
| Item in Stock | |
| More Options & Item Details | |
| ID: | 717165 |
| Weight: | 13.25ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Opaque |
| Content: | 1 pc |
| Price: | $ 25.28 |
| Item in Stock | |
| More Options & Item Details | |
| ID: | 564824 |
| Weight: | 13.11ct |
| Size: | 18 mm (calibrated) |
| Clarity: | Translucent |
| Content: | 1 pc |
| Price: | $ 51.91 |
| Item in Stock | |
| More Options & Item Details | |
GemSelect Certified Store Reviews
GemSelect: Over 18 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10 
Loved everything. High quality, quick shipping, and authentication included.
Posted By Chris in March, 2025
Source: Bizrate
Overall Rating -> 10
So far, my experience was great...Thanks
Posted By Kaydi in May, 2025
Source: Bizrate
Overall Rating -> 10
I always enjoy the selection and the unique cuts I can find here. I would love to see more hex cuts tho! Maybe some rose cuts too!
Posted By Blkfower83 in October, 2024
Source: Bizrate
Overall Rating -> 10
Good selection, trusted quality. What I have purchased has always been as discribed.
Posted By Sterling in November, 2024
Source: Bizrate
Overall Rating -> 10
I love the gems and your website, every time I want to buy I usually spend between 6 and 8 hours on your website.
Posted By Bryan De David in April, 2025
Source: Bizrate
Overall Rating -> 10
I love gemstones. My father was a jeweler & I used to shop for stones for him.
Posted By Andie in September, 2024
Source: Bizrate
Overall Rating -> 9 
I was looking for a small gift for a friend- the process is the same as every other time and was very simple, and she even got her gift early! On the downside, there's no way to easily keep track of multiple Shipping Addresses, so if I want to send a gift to Friend A and to Friend B, I have to overwrite everything and it's a fair bit clunky in that regard.
Posted By Jezzi in June, 2025
Source: Bizrate
Overall Rating -> 10
Appreciated the selection. Jadeite is hard to find under $100. Website has alot of variety.
Posted By Jess in February, 2025
Source: Bizrate
Overall Rating -> 10
I have ordered from Genselect before and always had a great experience. My go to source!
Posted By Kycaver in October, 2024
Source: Bizrate
