CAN'T-MISS COLLECTION Tropical Fantasy When Carla Amorim wants to escape the hustle and bustle of São Paulo, she flees to her provincial villa in the city of Marabá, Brazil. The fish, ferns, crocodiles, bananas, and other tropical elements of the local rain forest have proven so inspiring that they’re now permanent residents of her new Forest jewelry collection. Suggested retail prices in 18k gold start at $1,600.  Top: Seeds pendant necklace in 18k yellow gold with 0.34 ct. t.w. diamonds, $4,380, Fish earrings in 18k rose gold, $1,600, inset: Branches ring in 18k yellow gold, $2,400, Carla Amorim, Chicago, 312-305-6476, carlaamorim.com   HOT STOCK TIP Unequal Measures Dana Bronfman’s mod, matte-finished styles made in recycled 18k gold have a whimsical flair that’s hard to forget. Bronfman’s designs feature playful interpretati