Owner Ken Corey has been looking after the store for the past 65 years. Dubes Jewerly also has an onsite gemologist with 40 years of experience. Leon Maerz is an in-resident graduate of the Gemological Institute of America (GIA). He also completed International Society of Appraisers (ISA) studies. Leon is very knowledgeable and able to evaluate gemstone quality and grade diamonds (cut, clarity, color, and carat weight) for purchasing and appraising.