16 - 18 mm Amethyst Gemstones

16 - 18 mm Amethyst Gems

Gemstone Information

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Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

Overall Rating -> 10

i made an order in 2007 and was very pleased; it made into a lovely ring. i found a large citrine locally, and now needed some accent stones.

Posted By Morgana zanos in March, 2023

Source: Bizrate

Overall Rating -> 10

The product was held up in Anchorage Alaska due to customs. It was also delayed in the U.S. by bad weather. Final delivery was not until the 29th of December.

Posted By Dick in December, 2022

Source: Bizrate

Overall Rating -> 10

So many stones, so little time and money. Easy to fill up the cart when the stones are beautifully pictured. I hope the real items are as beautiful.

Posted By Wen in January, 2023

Source: Bizrate

Overall Rating -> 8

1st time buy. The experience to date has been easy.

Posted By Q in December, 2022

Source: Bizrate

Overall Rating -> 10

I loved my gem stones and i will order again and I would refer friends and family to purchase her in the future

Posted By Tina in October, 2022

Source: Bizrate

Overall Rating -> 10

Excellent selection of products. Website easy to navigate and make purchases.

Posted By David in April, 2023

Source: Bizrate

Overall Rating -> 10

I like it

Posted By Swan in February, 2023

Source: Bizrate

Overall Rating -> 10

Have been buying from Gem Select for years, always satisfied.

Posted By Chtristopher in December, 2022

Source: Bizrate

Overall Rating -> 10

Fantastic dealer for quality gemstones. Website is easy to navigate, selection is superb, delivery of purchases is prompt. Easy to select incorrect payment options, however.

Posted By David W in May, 2023

Source: Bizrate

Overall Rating -> 9

Good experience

Posted By JR in January, 2023

Source: Bizrate

Overall Rating -> 9

Would like returning customers to be able to sign in. Didn’t see this option on site. Love your products and UX is good.

Posted By Dgb in December, 2022

Source: Bizrate

Overall Rating -> 10

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber in September, 2023

Source: Bizrate

Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 2023

Source: Bizrate

Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

Source: Bizrate

Overall Rating -> 10

I have used Gem Select many times over the past 10 years and have always been happy with the product & services

Posted By Ordain in August, 2023

Source: Bizrate

Selected Gemstones

Gemstones A-Z

Buy 16 - 18 mm Amethyst Gems

9.71 ct Oval Diamond Cut Amethyst, 16.7 x 13.5 mm From Brazil

7.07 ct Pear Cut Amethyst, 16 x 12 mm From Brazil

10.28 ct Carved Amethyst, 16.6 x 13 mm From Brazil

20.97 ct Oval Cut Amethyst, 18 x 15.4 mm From Brazil

21.58 ct Cushion Cut Amethyst, 16.2 x 15.8 mm From Brazil

20.59 ct Cushion Cut Amethyst, 18 x 17.9 mm From Brazil

7.23 ct Pear Cut Amethyst, 16 x 11.9 mm From Brazil

20.77 ct Cushion Cut Amethyst, 17.9 x 17.9 mm From Brazil

9.71 ct Odd Shaped Amethyst, 17.2 x 10.6 mm From Brazil

17.11 ct Octagon Cut Amethyst, 17.3 x 13.7 mm From Brazil

27.65 ct Octagon Cut Amethyst, 18 x 17.3 mm From Brazil

12.2 ct Cushion Cut Amethyst, 16.1 x 15.9 mm From Brazil

18.76 ct Cushion Cut Amethyst, 18 x 17.6 mm From Brazil

19.53 ct Cushion Cut Amethyst, 18 x 18 mm From Brazil

21.46 ct Cushion Cut Amethyst, 18 x 18 mm From Brazil

15.12 ct Cushion Cut Amethyst, 16.1 x 16.1 mm From Brazil

13.67 ct Cushion Cut Amethyst, 16 x 16 mm From Brazil

20.07 ct Cushion Cut Amethyst, 17.9 x 17.8 mm From Brazil

16.45 ct Cushion Cut Amethyst, 16.2 x 16.1 mm From Brazil

17.67 ct Octagon Cut Amethyst, 17.9 x 13.9 mm From Brazil

17.4 ct Octagon Cut Amethyst, 17.8 x 14.2 mm From Brazil

17.68 ct Octagon Cut Amethyst, 17.8 x 13.9 mm From Brazil

16.51 ct Octagon Cut Amethyst, 17.9 x 14 mm From Brazil

16.33 ct Octagon Cut Amethyst, 18 x 14 mm From Brazil

16.17 ct Octagon Cut Amethyst, 17.9 x 14.1 mm From Brazil

13.48 ct Round Cut Amethyst, 16 mm From Brazil

14.47 ct Round Cut Amethyst, 16.1 mm From Brazil

13.06 ct Round Cut Amethyst, 16.1 mm From Brazil

14.24 ct Round Cut Amethyst, 16.2 mm From Brazil

13.53 ct Round Cut Amethyst, 16.1 mm From Brazil

12.86 ct Round Cut Amethyst, 16.1 mm From Brazil

12.47 ct Round Cut Amethyst, 16.1 mm From Brazil

16 - 18 mm Amethyst Gems

Gemstone Information