Calibrated 18 x 13 mm Oval Shape Natural Loose Gemstones: GemSelect

Item Description
Stone Type:	Loose Opal
Opal Weight:	6.50 ct Opal
Opal Shape:	Oval Facet Opal
Opal Size:	17.3 x 12.9 mm Opal
Opal Color:	Multicolor Opal
Opal Clarity:	Transparent Opal
Opal Origin:	Australia Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Opal
Opal Weight:	9.66 ct Opal
Opal Shape:	Oval Cabochon Opal
Opal Size:	18.4 x 13.5 mm Opal
Opal Color:	Multicolor Opal
Opal Clarity:	Translucent Opal
Opal Origin:	Ethiopia Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Opal
Opal Weight:	10.37 ct Opal
Opal Shape:	Oval Cabochon Opal
Opal Size:	18.2 x 13.5 mm Opal
Opal Color:	Earth Green Opal
Opal Clarity:	Opaque Opal
Opal Origin:	Brazil Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Opal
Opal Weight:	16.50 ct Opal
Opal Shape:	Oval Cabochon Opal
Opal Size:	18.6 x 13.4 mm Opal
Opal Color:	Yellowish Green Opal
Opal Clarity:	Opaque Opal
Opal Origin:	Brazil Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Opal
Opal Weight:	4.41 ct Opal
Opal Shape:	Oval Cabochon Opal
Opal Size:	17.7 x 12.6 mm Opal
Opal Color:	Multicolor Opal
Opal Clarity:	Translucent Opal
Opal Origin:	Australia Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Opal
Opal Weight:	10.14 ct Opal
Opal Shape:	Oval Cabochon Opal
Opal Size:	17.7 x 13.4 mm Opal
Opal Color:	Yellowish Green Opal
Opal Clarity:	Opaque Opal
Opal Origin:	Brazil Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

Item Description
Stone Type:	Loose Opal
Opal Weight:	7.75 ct Opal
Opal Shape:	Oval Cabochon Opal
Opal Size:	17.8 x 13.4 mm Opal
Opal Color:	Multicolor Opal
Opal Clarity:	Translucent Opal
Opal Origin:	Australia Opal
Opal Treatment:	Untreated
Opal Quantity:	1
Opal Certificate:	GemSelect
Product Description:

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 oval shapes, facet cut and cabochon gems available now in 18 x13 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

Gemstone Information

Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

Overall Rating -> 10

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 -> 10

The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

Posted By JAB93 in June, 2023

Source: Bizrate

Overall Rating -> 10

great. thank you

Posted By Carrotroller in July, 2023

Source: Bizrate

Overall Rating -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

Posted By Bikerwalrus in October, 2023

Source: Bizrate

Overall Rating -> 10

Great selection, I love your site! Great product visibility, information, etc.

Posted By John in February, 2024

Source: Bizrate

Overall Rating -> 10

all good

Posted By John in December, 2023

Source: Bizrate

Overall Rating -> 10

Everthing about researching and ordering from Gemselect was easy and uncomplicated. In the past I had payment problems, but your customer rep, Thomas, helped me get everything right. I will continue using Gemselet in the future for these reasons.

Posted By WildwillyfromArizona in August, 2023

Source: Bizrate

Overall Rating -> 9

My first purchase went well. I will purchase more gems in the future.

Posted By NoHalalAl in March, 2024

Source: Bizrate

Overall Rating -> 8

I am currently pleased. I like the layout of the website.

Posted By RayPoppa in January, 2024

Source: Bizrate

Overall Rating -> 10

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

Posted By Ray in February, 2024

Source: Bizrate

Overall Rating -> 10

The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

Posted By Orchidisle in February, 2024

Source: Bizrate

Overall Rating -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

Easy to use,I have spent many hours looking at the site

Posted By Skip in November, 2023

Source: Bizrate

Overall Rating -> 10

I particularly like information about product provided with purchase.

Posted By Dick in May, 2023

Source: Bizrate

Overall Rating -> 10

this was very easy im exited to get my order

Posted By Mr. in April, 2024

Source: Bizrate

Selected Gemstones

Gemstones A-Z

Buy Oval Shape 18x13 mm Gems

6.5 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 17.3 x 12.9 mm

Natural Opal, Qty: 1 pc | 6.50 carat weight Opal

9.66 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 18.4 x 13.5 mm

Natural Opal, Qty: 1 pc | 9.66 carat weight Opal

10.37 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.2 x 13.5 mm

Natural Opal, Qty: 1 pc | 10.37 carat weight Opal

16.5 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.6 x 13.4 mm

Natural Opal, Qty: 1 pc | 16.50 carat weight Opal

4.41 ct Loose Oval Opal, 17.7 x 12.6 mm From Australia

Natural Opal, Qty: 1 pc | 4.41 carat weight Opal

10.14 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 17.7 x 13.4 mm

Natural Opal, Qty: 1 pc | 10.14 carat weight Opal

7.75 ct Loose Oval Opal, 17.8 x 13.4 mm From Australia

Natural Opal, Qty: 1 pc | 7.75 carat weight Opal

Gemstone Information

Gemstone SHOP

POLICIES

WHO ARE WE?

Gemstone EDUCATION

WE ARE LOCATED AT