TREND GAME Make Me a Mismatch Perfect matches in jewelry are so overrated. With today’s must-be-unique mindset—especially among millennials—collectors are encouraged to celebrate individual style, and mismatched earring sets are one way to do so. Stores can offer single earring studs or purposely pair oddball mates; just be prepared to do a little explaining to those unfamiliar with the idea.     Mismatched Fork and Spoon earrings in silver; $118; Alex Woo, NYC; 877-966-4266; alexwoo.com Crescent Moon & Stars mismatched earrings in oxidized sterling silver and 18k gold with 0.25 ct. t.w. diamonds; $2,000; Genevieve Yang, Santa Rosa, Calif.; 650-387-3491; genevieveyang.com   HOT STOCK TIP Going Spiral Inspired by the mathematical Fibonacci sequence, which gives rise to a perfect spiral-like design, de