A type of foil lining or material used historically in jewelry making and decorative arts to enhance the reflective quality of gemstones.
Likely a variant or specialized term from 'foil,' the thin metal backing placed behind gems. The 'du-' prefix may be French or indicate a specific regional variant. It appears in historical jewelry-making contexts, though it's now an obsolete term.
Before modern gemstone setting technology, jewelers used cleverly colored and reflective metal foils behind stones to make them sparkle more brilliantly. A 'dufoil' might have been a specialized version for specific gems—it's a reminder that jewelry making was more art and chemistry than it is today.
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