My right-hand woman Eryn and I just wrapped up our first appearance at the five-day Couture jewelry show in Las Vegas. We were part of Salon 137, the Contemporary Jewelry Design Group booth, with five other fabulous fine-jewelry brands: Ananda Khalsa, Anthony Lent, Baiyang Qiu, Dana Bronfman, and my longtime jewelry-biz friend Erika Winters. I’m…