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hard mass

or hard masse

See more synonyms for hard mass on Thesaurus.com
noun
  1. Jewelry. a hard glass used for imitating gemstones.
  2. (not in technical use)
    1. any glass for imitating gemstones, especially emerald.
    2. any of certain synthetic gemstones.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018