From gold-growing to printing and polishing, these tools and software systems can do it all.Retailers looking to update their in-store tools and technology flocked to the Equipment, Technology & Supplies show at JCK Las Vegas in early June, where 135 exhibitors showcased their latest products—from software designed to streamline retail operations to a lasering machine that turns gold powder into fully fashioned jewelry (yes, really). Here are our picks for the most notable new products on the market.Best in Show at ETSLeica’s hands-free bench microscope ($1,744; kassoy.com)The advent of 3-D printing has given rise to a sci-fi reality called additive manufacturing, in which objects are built by adding material layer by layer (as opposed to the old “subtractive” method of cutting and drilling metal). Pioneered by the medical, automotive, and dental industries to build prostheti