search
  • Sign In
    Sign Up
  • English speaking customer support only

    1-800-464-1640

    International:

    +66-39601289

  • Change Language
  • USD
  • CART
FREE SHIPPING

Buy 18 mm Quartz Gems

(5)
18 mm Quartz Weight 18 mm Quartz Size 18 mm Quartz Clarity 18 mm Quartz Price 18 mm Quartz Origin
More
18 mm Quartz Single
18 mm Quartz Pairs
18 mm Quartz Lots
18 mm Quartz Faceted
18 mm Quartz Cabochons
Sort By:
Clear All
Photos are of Actual Products for Sale
15.99ct Loose Quartz | 15.99 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil, Photo A

15.99 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil

Natural Quartz, Qty: 1 pc | 15.99 carat weight Quartz

15.99ct1 Piece
$ 64.55
18 mm
Item Description
Stone Type: Loose Quartz
Quartz Weight: 15.99 ct Quartz
Quartz Shape: Round Concave Cut Quartz
Quartz Size: 18 mm Quartz
Quartz Color: Greenish Yellow Quartz
Quartz Clarity: VVS-VS Quartz
Quartz Origin: Brazil Quartz
Quartz Treatment: Irradiated
Quartz Quantity: 1
Quartz Certificate: GemSelect
Product Description:
View Details
Add to Cart
16.42ct Loose Quartz | 16.42 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil, Photo A

16.42 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil

Natural Quartz, Qty: 1 pc | 16.42 carat weight Quartz

16.42ct1 Piece
$ 72.42
18 mm
Item Description
Stone Type: Loose Quartz
Quartz Weight: 16.42 ct Quartz
Quartz Shape: Round Concave Cut Quartz
Quartz Size: 18 mm Quartz
Quartz Color: Lemon Yellow Quartz
Quartz Clarity: VVS Quartz
Quartz Origin: Brazil Quartz
Quartz Treatment: Irradiated
Quartz Quantity: 1
Quartz Certificate: GemSelect
Product Description:
View Details
Add to Cart
16.29ct Loose Quartz | 16.29 ct Green Quartz, 18.1 mm Round Concave Cut From Brazil, Photo A

16.29 ct Green Quartz, 18.1 mm Round Concave Cut From Brazil

Natural Quartz, Qty: 1 pc | 16.29 carat weight Quartz

16.29ct1 Piece
$ 65.04
18.1 mm
Item Description
Stone Type: Loose Quartz
Quartz Weight: 16.29 ct Quartz
Quartz Shape: Round Concave Cut Quartz
Quartz Size: 18.1 mm Quartz
Quartz Color: Light Green Quartz
Quartz Clarity: VVS Quartz
Quartz Origin: Brazil Quartz
Quartz Treatment: Irradiated
Quartz Quantity: 1
Quartz Certificate: GemSelect
Product Description:
View Details
Add to Cart
14.35ct Loose Quartz | 14.35 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil, Photo A

14.35 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil

Natural Quartz, Qty: 1 pc | 14.35 carat weight Quartz

14.35ct1 Piece
$ 57.93
18 mm
Item Description
Stone Type: Loose Quartz
Quartz Weight: 14.35 ct Quartz
Quartz Shape: Round Concave Cut Quartz
Quartz Size: 18 mm Quartz
Quartz Color: Light Yellow Quartz
Quartz Clarity: VVS Quartz
Quartz Origin: Brazil Quartz
Quartz Treatment: Irradiated
Quartz Quantity: 1
Quartz Certificate: GemSelect
Product Description:
View Details
Add to Cart
14.85ct Loose Quartz | 14.85 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil, Photo A

14.85 ct Yellow Quartz, 18 mm Round Concave Cut From Brazil

Natural Quartz, Qty: 1 pc | 14.85 carat weight Quartz

14.85ct1 Piece
$ 59.95
18 mm
Item Description
Stone Type: Loose Quartz
Quartz Weight: 14.85 ct Quartz
Quartz Shape: Round Concave Cut Quartz
Quartz Size: 18 mm Quartz
Quartz Color: Laguna Yellow Quartz
Quartz Clarity: VVS Quartz
Quartz Origin: Brazil Quartz
Quartz Treatment: Irradiated
Quartz Quantity: 1
Quartz Certificate: GemSelect
Product Description:
View Details
Add to Cart
Read All

Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

Overall Rating -> 9 star ratings

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

I’ve enjoyed purchasing stones from this site. It’s convenient and fairly priced.

Posted By Chico in May, 2023
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 -> 10 star ratings

Very detailed and great pictures

Posted By Alexandrite in November, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Interested in unusual stones and found many that I purchased or will purchase in the near future. I have been a customer of gem select for almost ten years and have always been pleased with buying experience and the delivered product

Posted By Fairhope Pete in December, 2023
Source: Bizrate

Overall Rating -> 9 star ratings

I am of the opinion that the company gem select cares about the product beautiful gems it sells and the cost of the gem I purchased was small i was treated as if it cost a lot of money and product was described in detail and i felt good about the little stones i had ordered.

Posted By Sparkle in March, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and fast

Posted By Mark in February, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

the searching format was easy to find what i needed. It helped to be able to sort Lowest price to Highest because i wasnt looking to spend too much but i did want an actual stone and not imitation.

Posted By PixelComposer in January, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Love gemselect

Posted By Joshua Howard in March, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

I have had and will always have a great time shopping at GemSelect. It's a great web site with great products and great service.

Posted By Apps in November, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!

Posted By Ana in September, 2023
Source: Bizrate

Overall Rating -> 9 star ratings

GemSelect has a fantastic assortment of Semi-precious stones. I have not found any other web site with the variety you have.

Posted By RobDill in August, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Limited supply of higher quality gemstones.

Posted By Newfguy in February, 2024
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.

6708

Continue Shopping
Checkout
Continue Shopping
Checkout