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NAFCOgems

Loose Gray Gemstones

Carat range:

mm range:

We have a selection of exquisite, round sapphires from the Umba River area in Tanzania. These sapphires possess a diamond-like brilliance and come in a variety of delicate pastel hues. They are in their natural, untreated state, retaining their original b

Diamond Cut Round Untreated / Unheated Pastel Sapphire Melee 1.5 mm +

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Natural untreated round organic color gray sapphire. This super brilliant Tanzanian sapphire is from the Umba River region of Africa. The color of this well cut unheated sapphire is very unique yet very typical of the Umba region as it has notes of

Loose Round Untreated / Unheated Gray Sapphire (6.8 mm)

6.8 x 6.8 x 4.4

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Natural untreated oval sapphire with slight color change from champagne gray to verbena green. This brilliant Tanzanian sapphire is from the Umba River region of Africa. The color of this well cut unheated sapphire is very unique yet very typical of th

Loose Oval Untreated Verbena Green Sapphire with Gray Undertones

8.6 x 6.3 x 4.1

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Natural untreated oval sapphire with slight color change from champagne to gray greige. This brilliant Tanzanian sapphire is from the Umba River region of Africa. The color of this well cut unheated sapphire is very unique yet very typical of the Umba

Loose Oval Untreated / Unheated Greige Gray Umba Sapphire

8.5 x 6.5 x 3.9

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Natural untreated oval sapphire with slight color change from gray to an organic verbena green. This Tanzanian sapphire is from the Umba River region of Africa. The color of this well cut unheated sapphire is very unique yet very typical of the Umba reg

Loose Oval Untreated / Unheated Gray Sapphire From Tanzania

8.5 x 6.5 x 4.3

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Natural untreated oval gray sapphire. This bright Tanzanian grey sapphire is from the Umba River region of Africa. The color of this well cut unheated Umba sapphire is very unique yet very typical of the region as it has notes of muted pastel tones.

Loose Oval Untreated Gray Sapphire

8.5 x 6.4 x 4.5

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Natural untreated oval gray sapphire. This bright Tanzanian grey sapphire is from the Umba River region of Africa. The color of this well cut unheated Umba sapphire is very unique yet very typical of the region as it has notes of muted pastel tones.

Loose Oval Untreated Gray Sapphire

8.5 x 6.5 x 4.2

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Natural untreated gray blue teal marquise sapphire. This bright unheated Tanzanian sapphire is from the Umba River region of Africa. The color of this well cut unheated teal sapphire is very unique yet very typical of the Umba region as it has notes of mu

Loose Marquise Untreated Gray Blue Teal Sapphire from Umba

7.9 x 4.3 x 3.1

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Natural untreated marquise greige sapphire. This bright unheated Tanzanian sapphire is from the Umba River region of Africa. The color of this well cut unheated gray sapphire is very unique yet very typical of the Umba region as it has notes of muted past

Loose Marquise Untreated Greige Gray Sapphire from Umba

11 x 5.5 x 4.3

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Natural untreated round rose-cut black sapphire from the Umba River region in Tanzania. This unheated black sapphirerose cut with faceted culet bottom is very reflective and in certain light reveals brown highlights. Rare and Unique!

Loose Round Rose-Cut Untreated Umba Black Sapphire

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Untreated light gray sapphire freeform slab. This natural Umba sapphire hexagon slice in the gray tones is fully high polished and has a beveled facet girdle. A one-of-a-kind natural sapphire.

Loose Umba Untreated Light Gray Sapphire Hexagon Slab/Slice

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Untreated blue sapphire freeform slab. This natural geometric Umba sapphire slice is fully high polished and has a beveled facet girdle. A one-of-a-kind natural sapphire beauty!

Loose Untreated Blue Sapphire Freeform Slab/Slice

10.7 x 7 x 2.7

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Not finding what you are looking for or have a special request? Since Our inventory of wholesale loose gemstones is vast we have much more then what you see online. Please give us a call at 800-528-4490 or Click Here to Contact Us