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Home / Gem Library / Gemstones Varieties / Demantoid August 15, 2020

Natural Demantoid

Demantoid, (a green form of andradite garnet), is one of the most highly prized of all garnets.

  • There are 12 Demantoid gemstones available at
  • Demantoid(s) are organized in the following categories: CalibratedSingle,  gemstones.
  • Our most expensive Demantoid is USD 10815.84 and largest Demantoid weight is CTS 2.83.
  • Our cheapest Demantoid is USD 4.50 and smallest Demantoid weight is CTS 0.04.

Find your Demantoid

Our Demantoid(s) are available in various shapes, sizes and colors. 12 Demantoid(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Color range
strongly yellowish green
slightly yellowish green
yellowish green

Demantoid Profile

Color information: Green, yellow green.
Refractive Index: 1.888 - 1.889
Chemical Composition: Ca3Fe2(SiO4)3
Hardness: 6.5
Density: 3.82 - 3.50
Crystal Group: Cubic
Ocurrence: Russia, Namibia, Iran, South Africa
Sign of the Zodiac: N/A
Month of the year: N/A
Demantoid Demantoid
The distinctive features of demantoid are the characteristic inclusions of yellow byssolite (asbestos) fibers with radiating arrangements known as 'horsetails'. Although the horsetails are diagnostic for demantoid, they are not required for a stone to be identified as a demantoid. The identification of demantoid is based on the chemistry and refractive index of the stone. Many stones do not have horsetails at all.

Apparently, only the Russian demantoids possess the horsetail inclusions. Namibian stones are not known to ever have horsetails. The Pakistani stones may have occasional horsetails or possibly single fibers of byssolite but this has not been confirmed. If the horsetail-byssolite inclusions are present in the Pakistani stones, they are not clearly defined and very difficult to distinguish from the other inclusions.

Although, the Russian stones with horsetails seem to be worth much more than the demantoids from other localities, we also value demantoids according to their color and clarity. Demantoid has a very high refractive index (even higher than diamond) and will be remarkably bright and beautiful if cut correctly. If the color, cut, and clarity are good but the stone does not have horsetails, it is still a valuable stone.

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Demantoid range/
Demantoid Single
Demantoid Single Shield Slightly included
Size: 9.61 X 7.67 MM
Weight: 2.600 CTS
Shape: Shield
Clarity: Slightly included
Usually ships within 24 hours
USD 10815.84
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Demantoid Calibrated
Demantoid Calibrated Round Eye clean to Slightly included
Size: 2.00 X 2.00 MM
Weight: 0.040 CTS
Shape: Round
Clarity: Eye clean to Slightly included
Usually ships within 24 hours
USD 4.50
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