Definition

1. Noun:
   • A green variety of andradite garnet used as a gemstone: Demantoid is a specific, rare, and valuable type of garnet known for its brilliant green color and high dispersion (fire), which often exceeds that of diamond.

Usage

• Demantoid is used as a countable noun to refer to the gemstone itself.
• It is a term primarily used in the fields of gemology, mineralogy, and jewelry.

Examples

• Noun:
  • The vintage brooch was set with a stunning demantoid surrounded by diamonds.
  • Collectors highly prize Russian demantoids for their exceptional quality and distinctive "horsetail" inclusions.

Advanced Usage

• As a modifier: The term can be used adjectivally to describe other nouns related to the gem.
  • She specializes in demantoid jewelry from the Art Nouveau period.
  • The demantoid market has seen significant price increases.

Variants and Related Words

• Andradite (n): The mineral species of garnet to which demantoid belongs. Not all andradite is demantoid; demantoid is the green, gem-quality variety.
• Garnet (n): The broader family of silicate minerals that includes demantoid, almandine, pyrope, and others.

Synonyms

• Green andradite: A more descriptive, less specific synonym.
• (There are no direct common synonyms, as "demantoid" is a specific technical term.)

Related Phrases/Idioms

• (There are no common idioms or phrasal verbs associated with this specific gemological term.)

Noun

1. a green andradite used as a gemstone