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Home Gemstones Nuummite
26.45 ct Black Nuummite Gemstone, Nuummite Gem in Octagon Step Cut Shape for Sale.
Photos are of Actual Product for Sale
26.45 ct Black Nuummite Stone, Natural Nuummite in Octagon Step Cut Shape for Sale Nuummite Gemstone in 18.9 x 16.9 mm Size for Sale, Nuummite Stone in Black with Blue Sparkle Color

26.45ct Natural Black Nuummite, Emerald Cut, 18.9x16.9 mm

9.7 out of 10
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Product ID: 630317
Type: Nuummite
Weight: 26.45 ct 1 gem
Size: mm calibrated
Size: 18.9 x 16.9 x 10.4 mm
Exact Size: 18.91 x 16.91 x 10.39 mm
Length x Width x Depth
Shape: Octagon Step Cut
Color: Black with Blue Sparkle
Clarity: Opaque
Treatment: Untreated
Origin: India
Content: 1 pc
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Product Description

This is a 26.45 carat natural black with blue sparkle Nuummite gem, 1 pc in octagon / emerald cut shape with an exact size of 18.91 x 16.91 x 10.39 mm. This loose Nuummite gemstone was mined in India and its clarity is Opaque. No treatment has been applied on this natural Nuummite stone

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GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

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

First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.

Posted By Salvo in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Always get a nice gemstone. Just like the picture. Never disappointed

Posted By Ron T in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 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
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!

Posted By Lkcisneros in March, 2026
Source: Bizrate
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