10.99ct ETW Earth-Mined Bluish Green Grandidierite – Cushion Cut, Large Stone

10.99ct ETW Earth-Mined Bluish Green Grandidierite – Cushion Cut, Large Stone

This impressive loose gemstone features an earth-mined bluish green grandidierite from Madagascar, showcasing distinctive blue-green coloration in an elegant cushion cut. Weighing a substantial 10.99 carats, this unheated gemstone offers generous dimensions, opaque clarity, and the unusual mineral character that makes grandidierite an intriguing addition to any gemstone collection.

Specifications:

Gemstone: Bluish Green Grandidierite
Carat Weight: 10.99ct ETW
Cut: Cushion Cut
Dimensions: 15.8 x 13.8 x 7.5 mm
Clarity: Opaque
Treatment: Unheated
Origin: Madagascar
Condition: New

Earth-mined bluish green grandidierite weighing 10.99ct ETW in a cushion cut from Madagascar, featuring opaque clarity, unheated character, and impressive dimensions.

This grandidierite displays an appealing combination of blue and green coloration, creating a distinctive appearance that sets it apart from more familiar colored gemstones. Its cushion cut combines softly rounded corners with a classic geometric outline, offering an attractive presentation that emphasizes the gemstone's natural body color.

Grandidierite is a rare magnesium-aluminum borosilicate mineral first discovered in Madagascar in 1902. It was named in honor of French naturalist Alfred Grandidier, whose extensive research contributed significantly to the understanding of Madagascar's natural history. The mineral is especially recognized for its characteristic blue-green coloration.

The distinctive coloration of grandidierite is primarily associated with iron within its crystal structure. Transparent examples can exhibit noticeable pleochroism, meaning different colors may be observed when viewed along different crystallographic directions. In opaque material such as this specimen, the gemstone is appreciated primarily for its body color and natural mineral character rather than transparency or internal brilliance.

Although grandidierite is an uncommon mineral species, gemstone quality varies considerably. Transparent, facetable examples are exceptionally scarce, while opaque specimens offer a different form of collectible appeal through their distinctive coloration, mineral composition, and unusual gemstone identity.

This gemstone is unheated, preserving its naturally occurring color without heat enhancement. Its opaque clarity gives it a solid, richly colored appearance that distinguishes it from transparent varieties.

At 10.99 carats with dimensions of 15.8 x 13.8 x 7.5 mm, this grandidierite offers impressive visual presence. Its substantial size and elegant cushion shape make it particularly suitable for a custom statement pendant, where its unusual bluish green coloration can be prominently displayed. It also makes an interesting addition to a collection of less commonly encountered gemstone species.

Madagascar is especially significant in the history of grandidierite as the location of its original discovery. The island is internationally recognized for its remarkable mineral diversity and remains an important source of this distinctive gemstone material.

With a hardness of approximately 7 to 7.5 on the Mohs scale, grandidierite offers reasonable resistance to scratching when handled carefully. Protective settings and precautions against sharp impacts are recommended to help preserve its appearance.

An impressive earth-mined bluish green grandidierite offering distinctive natural color, substantial size, and classic cushion-cut styling, together with the collectible appeal of an uncommon gemstone species.

(Stock Code: EDMM)

Keywords: loose gemstone, earth-mined grandidierite, bluish green grandidierite, blue green grandidierite, Madagascar grandidierite, Madagascan gemstone, cushion cut grandidierite, opaque grandidierite, unheated grandidierite, 10.99ct grandidierite, large grandidierite, rare mineral gemstone, collector gemstone, statement pendant gemstone