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Home Gemstones Boulder Opal
4.34 ct Multicolor Boulder Opal Gemstone, Boulder Opal Gem in Marquise Cabochon Shape for Sale.
Photos are of Actual Product for Sale
4.34 ct Multicolor Boulder Opal Stone, Natural Boulder Opal in Marquise Cabochon Shape for Sale Boulder Opal Gemstone in 18 x 9 mm (calibrated) Size for Sale, Boulder Opal Stone in Multicolor Color

4.34ct Natural Multicolor Boulder Opal, Marquise, 17.8x9 mm

9.7 out of 10
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Product ID: 243158
Type: Boulder Opal
Weight: 4.34 ct 1 gem
Size: 18 x 9 mm calibrated
Size: 17.8 x 9 x 3.9 mm
Exact Size: 17.77 x 9.00 x 3.93 mm
Length x Width x Depth
Shape: Marquise Cabochon
Color: Multicolor
Clarity: Opaque
Treatment: Untreated
Origin: Australia
Content: 1 pc
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Product Description

This is a 4.34 carat natural multicolor Boulder Opal gem, 1 pc in marquise shape with an exact size of 17.77 x 9.00 x 3.93 mm. This loose Boulder Opal gemstone was mined in Australia and its clarity is Opaque. No treatment has been applied on this natural Boulder Opal stone

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Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
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Overall Rating -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I did not realize these stones were of jewelry quality. They are really beautiful, just not what I was expecting which was more of a natural stone.

Posted By Jewelry Quality Stones in July, 2025
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Overall Rating -> 9 star ratings

I loved the selection of gemstones you have a to z

Posted By James in May, 2026
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Overall Rating -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
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