search
  • Sign In
    Sign Up

  • English speaking customer support only

    1-800-464-1640

    International:

    +66-39601289

  • Change Language
  • USD
  • CART
FREE SHIPPING

Buy Octagon Shape 18x13 mm Gems

(11)
Octagon Shape 18x13 mm Gems Weight Octagon Shape 18x13 mm Gems Size Octagon Shape 18x13 mm Gems Clarity Octagon Shape 18x13 mm Gems Price Octagon Shape 18x13 mm Gems Origin
More
Octagon Shape 18x13 mm Gems Single
Octagon Shape 18x13 mm Gems Pairs
Octagon Shape 18x13 mm Gems Lots
Octagon Shape 18x13 mm Gems Faceted
Octagon Shape 18x13 mm Gems Cabochons
Sort By:
Clear All
Photos are of Actual Products for Sale
20.43ct Loose Apatite | 20.43 ct Yellow Apatite, 17.5 x 13.2 mm Octagon Cut From Madagascar, Photo A
Click for Product Video (384010)

20.43 ct Yellow Apatite, 17.5 x 13.2 mm Octagon Cut From Madagascar

Natural Apatite, Qty: 1 pc | 20.43 carat weight Apatite

20.43ct1 Piece
$ 612.90
17.5 x 13.2 mm
Item Description
Stone Type: Loose Apatite
Apatite Weight: 20.43 ct Apatite
Apatite Shape: Octagon Facet Apatite
Apatite Size: 17.5 x 13.2 mm Apatite
Apatite Color: Yellow Brown Apatite
Apatite Clarity: VS-SI Apatite
Apatite Origin: Madagascar Apatite
Apatite Treatment: Untreated
Apatite Quantity: 1
Apatite Certificate: GemSelect
Product Description:
View Details
Add to Cart
13.52ct Loose Citrine | 13.52 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 18 x 13 mm, Photo A

13.52 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 18 x 13 mm

Natural Citrine, Qty: 1 pc | 13.52 carat weight Citrine

13.52ct1 Piece
$ 94.64
18 x 13 mm
Item Description
Stone Type: Loose Citrine
Citrine Weight: 13.52 ct Citrine
Citrine Shape: Octagon Step Cut Citrine
Citrine Size: 18 x 13 mm Citrine
Citrine Color: Medium Golden Citrine
Citrine Clarity: VS Citrine
Citrine Origin: Brazil Citrine
Citrine Treatment: Untreated
Citrine Quantity: 1
Citrine Certificate: GemSelect
Product Description:
View Details
Add to Cart
11.88ct Loose Citrine | 11.88 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 17.8 x 12.9 mm, Photo A

11.88 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 17.8 x 12.9 mm

Natural Citrine, Qty: 1 pc | 11.88 carat weight Citrine

11.88ct1 Piece
$ 83.16
17.8 x 12.9 mm
Item Description
Stone Type: Loose Citrine
Citrine Weight: 11.88 ct Citrine
Citrine Shape: Octagon Step Cut Citrine
Citrine Size: 17.8 x 12.9 mm Citrine
Citrine Color: Medium Gold Citrine
Citrine Clarity: VVS Citrine
Citrine Origin: Brazil Citrine
Citrine Treatment: Untreated
Citrine Quantity: 1
Citrine Certificate: GemSelect
Product Description:
View Details
Add to Cart
14.68ct Loose Citrine | 14.68 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 17.9 x 12.9 mm, Photo A
Click for Product Video (634969)

14.68 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 17.9 x 12.9 mm

Natural Citrine, Qty: 1 pc | 14.68 carat weight Citrine

14.68ct1 Piece
$ 102.76
17.9 x 12.9 mm
Item Description
Stone Type: Loose Citrine
Citrine Weight: 14.68 ct Citrine
Citrine Shape: Octagon Step Cut Citrine
Citrine Size: 17.9 x 12.9 mm Citrine
Citrine Color: Golden-Yellow Citrine
Citrine Clarity: VVS Citrine
Citrine Origin: Brazil Citrine
Citrine Treatment: Untreated
Citrine Quantity: 1
Citrine Certificate: GemSelect
Product Description:
View Details
Add to Cart
15.66ct Loose Amethyst | 15.66 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.3 x 13.3 mm, Photo A

15.66 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.3 x 13.3 mm

Natural Amethyst, Qty: 1 pc | 15.66 carat weight Amethyst

15.66ct1 Piece
$ 109.62
18.3 x 13.3 mm
Item Description
Stone Type: Loose Amethyst
Amethyst Weight: 15.66 ct Amethyst
Amethyst Shape: Octagon Step Cut Amethyst
Amethyst Size: 18.3 x 13.3 mm Amethyst
Amethyst Color: Medium Purplish Violet Amethyst
Amethyst Clarity: VS Amethyst
Amethyst Origin: Brazil Amethyst
Amethyst Treatment: Untreated
Amethyst Quantity: 1
Amethyst Certificate: GemSelect
Product Description:
View Details
Add to Cart
15.67ct Loose Amethyst | 15.67 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.3 x 13.2 mm, Photo A

15.67 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.3 x 13.2 mm

Natural Amethyst, Qty: 1 pc | 15.67 carat weight Amethyst

15.67ct1 Piece
$ 109.69
18.3 x 13.2 mm
Item Description
Stone Type: Loose Amethyst
Amethyst Weight: 15.67 ct Amethyst
Amethyst Shape: Octagon Step Cut Amethyst
Amethyst Size: 18.3 x 13.2 mm Amethyst
Amethyst Color: Purplish Violet Amethyst
Amethyst Clarity: VS Amethyst
Amethyst Origin: Brazil Amethyst
Amethyst Treatment: Untreated
Amethyst Quantity: 1
Amethyst Certificate: GemSelect
Product Description:
View Details
Add to Cart
14.44ct Loose Amethyst | 14.44 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.5 x 13.3 mm, Photo A

14.44 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.5 x 13.3 mm

Natural Amethyst, Qty: 1 pc | 14.44 carat weight Amethyst

14.44ct1 Piece
$ 101.08
18.5 x 13.3 mm
Item Description
Stone Type: Loose Amethyst
Amethyst Weight: 14.44 ct Amethyst
Amethyst Shape: Octagon Step Cut Amethyst
Amethyst Size: 18.5 x 13.3 mm Amethyst
Amethyst Color: Deep Purplish Violet Amethyst
Amethyst Clarity: VVS-VS Amethyst
Amethyst Origin: Brazil Amethyst
Amethyst Treatment: Untreated
Amethyst Quantity: 1
Amethyst Certificate: GemSelect
Product Description:
View Details
Add to Cart
12.21ct Loose Amethyst | 12.21 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.1 x 13.1 mm, Photo A

12.21 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.1 x 13.1 mm

Natural Amethyst, Qty: 1 pc | 12.21 carat weight Amethyst

12.21ct1 Piece
$ 85.47
18.1 x 13.1 mm
Item Description
Stone Type: Loose Amethyst
Amethyst Weight: 12.21 ct Amethyst
Amethyst Shape: Octagon Step Cut Amethyst
Amethyst Size: 18.1 x 13.1 mm Amethyst
Amethyst Color: Medium Purplish Violet Amethyst
Amethyst Clarity: VVS-VS Amethyst
Amethyst Origin: Brazil Amethyst
Amethyst Treatment: Untreated
Amethyst Quantity: 1
Amethyst Certificate: GemSelect
Product Description:
View Details
Add to Cart
15.55ct Loose Amethyst | 15.55 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 x 13.1 mm, Photo A

15.55 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 x 13.1 mm

Natural Amethyst, Qty: 1 pc | 15.55 carat weight Amethyst

15.55ct1 Piece
$ 108.85
18.2 x 13.1 mm
Item Description
Stone Type: Loose Amethyst
Amethyst Weight: 15.55 ct Amethyst
Amethyst Shape: Octagon Step Cut Amethyst
Amethyst Size: 18.2 x 13.1 mm Amethyst
Amethyst Color: Purplish Violet Amethyst
Amethyst Clarity: VVS-VS Amethyst
Amethyst Origin: Brazil Amethyst
Amethyst Treatment: Untreated
Amethyst Quantity: 1
Amethyst Certificate: GemSelect
Product Description:
View Details
Add to Cart
21.73ct Loose Kunzite | 21.73 ct Loose Pink Kunzite, 18.2 x 13.4 mm Octagon Cut From Afghanistan, Photo A

21.73 ct Loose Pink Kunzite, 18.2 x 13.4 mm Octagon Cut From Afghanistan

Natural Kunzite, Qty: 1 pc | 21.73 carat weight Kunzite

21.73ct1 Piece
$ 575.85
18.2 x 13.4 mm
Item Description
Stone Type: Loose Kunzite
Kunzite Weight: 21.73 ct Kunzite
Kunzite Shape: Octagon Step Cut Kunzite
Kunzite Size: 18.2 x 13.4 mm Kunzite
Kunzite Color: Very Light Pink Kunzite
Kunzite Clarity: VVS-VS Kunzite
Kunzite Origin: Afghanistan Kunzite
Kunzite Treatment: Untreated
Kunzite Quantity: 1
Kunzite Certificate: GemSelect
Product Description:
View Details
Add to Cart
15.58ct Loose Amethyst | 15.58 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 x 13.4 mm, Photo A

15.58 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 x 13.4 mm

Natural Amethyst, Qty: 1 pc | 15.58 carat weight Amethyst

15.58ct1 Piece
$ 109.06
18.2 x 13.4 mm
Item Description
Stone Type: Loose Amethyst
Amethyst Weight: 15.58 ct Amethyst
Amethyst Shape: Octagon Step Cut Amethyst
Amethyst Size: 18.2 x 13.4 mm Amethyst
Amethyst Color: Medium Purplish Violet Amethyst
Amethyst Clarity: VS Amethyst
Amethyst Origin: Brazil Amethyst
Amethyst Treatment: Untreated
Amethyst Quantity: 1
Amethyst Certificate: GemSelect
Product Description:
View Details
Add to Cart

Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Octagon shape / Emerald-Cut, faceted and cabochon gems available now in 18 x 13 mm size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

Read All

Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

Easy to use as always and in all steps from opening site to paying.

Posted By Pete in February, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Todo muy bien en la compra ahora esperar recibir el pedido.

Posted By MAGSMX in August, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to find products I want. I've ordered several times from gem select and never any problems. Will order again. Thank you.

Posted By Ray in January, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

The website is easy to navigate and the images are incredible.

Posted By Lindsy in October, 2023
Source: Bizrate

Overall Rating -> 9 star ratings

The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

Posted By Kasper in June, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent site.

Posted By Boru in December, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Selection and purchasing online was very easy

Posted By Aggy in January, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

I enjoyed browsing though different varieties of rubies. I felt that the experience was simple and easy to navigate!

Posted By Daws in July, 2023
Source: Bizrate

Overall Rating -> 9 star ratings

An it was good.

Posted By Miguel in June, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 2023
Source: Bizrate

Overall Rating -> 8 star ratings

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024
Source: Bizrate

Overall Rating -> 7 star ratings

I feel pretty good so far, pending the delivery of the item ordered.

Posted By Steve in November, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

I FOUND WHAT I WANT IT

Posted By GABY in March, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.

Posted By Dee in September, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

Posted By Oakcityceo in May, 2023
Source: Bizrate
STAY IN TOUCH | NEWSLETTER
*You're signing up to receive GemSelect promotional email.
Partners and Trust Payment options

Switch to Mobile Version

Copyright © 2005-2024 GemSelect.com all rights reserved.

Reproduction (text or graphics) without the express written consent of GemSelect.com (SETT Company Ltd.) is strictly prohibited.

966

Continue Shopping
Checkout
Continue Shopping
Checkout