the.com/demantoid
the green garnet so brilliant it out-sparkles diamond, then politely refuses to be one.
means Demantoid is a rare, vivid green variety of andradite garnet prized by gem collectors for its exceptional brilliance and high dispersion — the fiery rainbow flash usually associated with diamond.
from The name comes from the German Demant, an old form of 'diamond' (itself descended, through medieval Latin and Greek adamas, 'unconquerable,' from the same root that gives us 'adamant'), plus the Greek-derived suffix -oid, 'resembling.' So demantoid means, quite literally, 'diamond-like' — a nod to the stone's diamond-rivalling sparkle. It was named in the 19th century after the gem turned up in Russia's Ural Mountains.
- name origin
- Dutch for diamond-like, earned by extreme fire
- horsetail tell
- fibrous inclusions prove rare Russian Ural origin
- dispersion
- scatters more rainbow light than actual diamond
- tsar favorite
- Faberge hoarded it for imperial Russian jewels
- chromium soul
- that vivid green comes from trace chromium
demantoid from andradite — calcium iron silicate garnet with refractive index 1.88-1.89, found in russia's urals since 1868
madagascar demantoid deposits — significant source discovered in merelava region, producing vivid green stones with high dispersion
horsetail inclusion demantoid — distinctive needle-like chromite inclusions characteristic of russian ural demantoids, diagnostic feature