Not quite ready for a cold snap? Brilliant opals call to mind turquoise waters and fiery sunsets. Cartier’s sea green opal and emerald bead bracelet, one of the sumptuous pieces that debuted at the Biennale des Antiquaires in Paris, indulges the famed house’s love of imaginary creatures. The elaborate creation is accented with two fanciful dragons that serve as protectors for the oceanlike design. Conversely, Neil Lane and Lotus Arts de Vivre opt for the orange fire opal. Lane turns to his longtime client and muse Jennifer Lopez as inspiration for his vintagey ring. Juxtaposing light and dark, Lotus Arts de Vivre pits a luminescent rectangular stone against gothic white gold and black rhodium dotted with diamonds. That’s one bold statement.