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Tremblant, French for "trembling"). A brooch, pendant, aigrette or hair ornament decorated with a flower or other motif that has at the top stiff projecting wires (embellished with gemstones) that tremble when the piece is subjected to any movement. Sometimes the projections are finely coiled silver springs, such as were used in the 18th century, but some examples were made with tubular stems enclosing a strip of steel spring.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson