Since we’re suckers for sparkling chunks of drusy and slices of geodes, we had to track down Colorado-based designer Nina Nguyen for our annual fashion issue. We found her (alas, only via email!) traveling in her native Vietnam. But soon she’ll be in Vegas, at the Design Center at the JCK show, with “solid gold, silver, black-oxidized and super-delicious, all-you-can-eat, yummy, one-of-a-kind pieces!” Another thing you’ll find at her booth: a bangle engraved with the name of a disabled child affected by Agent Orange. Says Nguyen: “Proceeds from the sale of the bangle will go to an organization I work with to care for these children.”    Age: 36 Number of years in the biz: 11 Number of employees you oversee: 25 Baci Family and pets: Husband and a 5-pound Chihuahua named Baci who is way more popular in Vegas than I am. Describe your personal s