Greg Glemser Doylestown Gold Exchange Doylestown, Pa.   Co-owner doylestowngoldexchange.com What has been your most memorable sale? We’re an hour north of Philadelphia, and we had a young kid drive up here—he was 24 and just graduating from the firefighter academy. He had a $2,500 budget, and we were able to set him up with a 0.75 carat diamond of really nice quality. And that meant a lot to him. He planned to propose to his girlfriend the night he graduated. We’ve had some really expensive sales since we’ve been in business, but the ones that stick out are the ones where we’re able to help people get something really great on a budget. What one advertisement or promotion elicited the biggest response, and why do you think it worked?  I do a lot of videos and tutorials [youtube.com/user/doylestowngold]. We took a bunch of them last year and create