$750Median
1Sold (12 mo)
$750Last sale
Demantoid specimens for sale
27 for sale · $100–$5,000 USD
179 in the gallery
Demantoid is a green garnet variety within the garnet group, distinguished by its vibrant, emerald-like hue and high refractive index that yields notable brilliance. Crystals often form as well-shaped, prismatic dodecahedra or rhombic dodecahedra with a glassy to adamantine lustre, and some specimens display a horsetail or needle-like inclusion texture that can accentuate their facets. The color ranges from yellow-green to deep forest green, and when cut, the stones exhibit strong fire and scintillation that attract collectors who value bright, clean color in a relatively small, dense mineral.
- Formula
- Ca3Fe3+2(SiO4)3
- Rarity
- Rare
- Stability
- Stable
- Collector interest
- Very High Interest
- Classification notes
- Silicate (nesosilicate), garnet group; Strunz 9.AD.25
Key characteristics
- Crystal system
- isometric
- Mohs hardness
- 6.5–7
- Specific gravity
- 3.82–3.88
- Luster
- adamantine, vitreous
- Transparency
- transparent, translucent
- Color
- green, yellow
- Streak
- white
- Cleavage
- none
- Fracture
- conchoidal, uneven
- Crystal habit
- dodecahedral, granular, massive
- Gem mineral
- Classic / historic
Buy Demantoid specimens
View all 27Where Demantoid is found
Top localities
- Antetezambaro18 specimens
- Italy7 specimens
- Ghazni6 specimens
- Antetezambato Demantoid-Topazolite Mine4 specimens
- Lanzada3 specimens
- Kandahar2 specimens
- Belqeys Mountain2 specimens
- Afghanistan1 specimen
- Greece1 specimen
- Madagascar1 specimen
About Demantoid
Notable localities include Madagascar, Iran, Italy, Namibia, and Afghanistan, where Demantoid crystals have been recovered from alluvial, metamorphic, and garnet-bearing skarns and pegmatites. Madagascar is famous for vivid, gem-grade crystals, while Iran and Namibia have produced solid crystals with substantial size and clarity, contributing to the mineral’s desirability among field collectors and cabinet displays alike. Specimens often arrive in matrix or as loose crystals, and exceptional pieces may show sharp crystal faces and minimal inclusions, underscoring their appeal for aesthetic and scientific value.
