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Demantoid is a rare, prized green variety of andradite garnet, named for its diamond-like luster and intense brilliance due to high dispersion (fire). This exceptionally vibrant green gem ranges from yellowish-green to emerald green and is most valued for its strong body color and fiery flashes of rainbow light. Famous for its characteristic "horsetail" inclusions and historically found in the Russian Urals, demantoid is a valuable gemstone used in high-end jewelry.

Key Characteristics

• Color: Vivid green, ranging from yellowish-green to a fine emerald green.

• Luster: Adamantine, a brilliant, diamond-like shine.

• Dispersion (Fire): Unusually high, producing rainbow-colored flashes of light that rival a diamond's brilliance.

• Rarity: One of the rarest and most sought-after colored gemstones, especially in larger sizes.

• Inclusions: Often contains distinctive, needle-like radiating inclusions known as "horsetails," which are considered desirable "fingerprints" and a sign of authenticity, particularly for Russian material.

• Hardness: 6.5-7 on the Mohs scale.

• Refractive Index: High, contributing to its brilliant sparkle.

History and Origin

• Discovery: First discovered in Russia's Ural Mountains in the 19th century.

• Historical Significance: Was a favorite of Tiffany & Co. gemologist George F. Kunz.

• Major Sources: Notable deposits are found in Russia, Namibia, and Iran.

Value & Preference

• Personal Preference:

  While intense green is highly valued, some collectors prefer lighter, yellowish-green stones for their more pronounced fire.

• Inclusions:

  The presence and type of inclusions, particularly the golden "horsetails," can add character and value to the stone.

• Modern Status:

  Due to limited supply, demantoid remains a rare and valuable gemstone in today's market.