In late November, Peter Yantzer retired after 20 years as executive director of the American Gem Society Laboratories. The following week, he spoke with JCK about his time at the lab and current industry issues. Do you think that the AGS cut grade improved the quality of make in the industry? Yantzer: Absolutely. We kept the zero cut grade at a really high standard. We introduced some factors into our system like weight ratio that plugged the hole of cutters killing fine makes by dinging the upper half so they could save on weight. A better-cut diamond is a better-looking diamond.