Meet The Team | JTI Diamond Co | San Antonio, TX | Our Team



We provide the kind of warm, familiar service that goes beyond knowing your name to knowing what’s on your personal wish list.

For more than 28 years, it’s been a privilege to invite you into that home, sharing some life’s most treasured moments. Your trust, your loyalty, and your friendship have been your biggest gifts to us along the way. Here’s to looking towards many years to come, and the new memories we are sure to create together.



Jimmy Turner Sr. is the owner of JTI Diamond Co. establishment. He is a Master Graduate Gemologist (GG) from the Gemological Institute of America (G.I.A) and a certified Gemologist Appraiser (CGA) from the prestigious American Gem Society (AGS). He has been in the diamond and jewelry industry for more than 45 years and provides experience and knowledge in diamonds, precious gemstones and exclusive fine jewelry. He has traveled around the country and world to sort through hundreds of diamonds and colored stones to find the best selection for our clients. His expertise and Jim’s sense of humor will put a smile on your face with all your jewelry needs. As Jim says, “Now you have a friend in the diamond business!”



Yolanda is the Co-owner of JTI Diamond Co. Establishment. Her personality and genuine affection for people contribute immensely to the successful path of JTI Diamond Co. since 1991. She is an expert at personalized jewelry, bridal, pearls and jewelry repair. She offers our clients over 30 years of experience, knowledge and customer satisfaction. Her passion is to design one-of-a kind unique pieces for her customer’s milestones in life.



Mariah Andell is the second generation of her family to operate JTI Diamond Co. Raised in the jewelry industry and accompanied by a GIA certificate in Diamonds and Diamond Grading, she specializes in diamonds, custom jewelry and bridal. She is an expert designer and skilled at 3D CAD jewelry design, crafting all stages of design in store. Her ability to translate customer’s emotions and personalities into custom pieces make her an integral part of our design process. Her passion is curating the best diamond selection for clients and personalizing the engagement ring with one-of-a-kind thoughtful detail. Check out her latest jewelry creations, exclusively on our website “Mariah Gabrielle Collection”.



Jonathan Turner is the second generation of JTI Diamond Co. family. He joined the family business 10 years ago with a keen eye for craftsmanship and diamonds. He is an avid watch aficionado, and passionate about gemology. He considers the jewelry industry the best of the three worlds: the sciences, the arts, and people. He is GIA certified and specializes in diamond grading and appraisals. Additionally, Jonathan provides extensive knowledge of timepieces, diamonds, custom pieces and repairs. He is committed to building long-lasting relationships through high-touch quality service and is always working to bring clients the highest quality brands, on-point trends and unparalleled customer service experiences.