Behind Dana Rebecca, the big jewelry business with a small-business philosophySitting in her white and pink jewel box of a showroom, high above Chicago’s Magnificent Mile, Dana Rebecca Designs founder Dana Gordon recounts a what-are-the-odds story. As a child, Gordon was fascinated by her grandmother’s three gold stacking rings, each set with rubies, emeralds, and sapphires in the shape of tulips. “I was told by my mom that they would be mine one day,” she says. The rings went missing when her grandmother developed dementia, and though Gordon’s father, a manufacturer of fine diamond jewelry, suggested they replicate them, nobody could remember their exact scale. Jennifer Yamina necklace in 14k rose gold with 0.22 ct. t.w. diamonds and 1.7 cts. t.w. amethyst; $1,100; Dana Rebecca, Chicago; 312-701-1773; danarebeccadesigns.com Fast-forward to Gordon’s engagement party,