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Justin Diamond
6 Reviews
Justin Diamond serves as a Sales Manager at Grappone Mazda, bringing comprehensive sales experience across all dealership operations after advancing through roles as a Lot Attendant, BDC Specialist, and Sales Consultant. He holds professional sales training from the Nelson Group and F&I excellence certification through Reahard & Associates. Justin was initially drawn to Grappone Mazda when it began moving in an exciting new direction and leadership was implementing innovative operational ideas, making him eager to be a part of that evolution. Guests working with Justin can expect to be treated with absolute integrity, kindness, and respect—core principles of the Grappone Mission that he fully stands behind while helping guests feel excited and confident throughout their journey. His favorite vehicle is the manual-transmission Mazda MX-5 Miata because of its engaging driving performance and classic gearbox.
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Write a Review6 Reviews of Justin Diamond
November 01, 2026
Graponne Mazda is the place to buy a car. Professional, factual and caring about the customer’s needs! Professional, factual and caring about the customer’s needs! More
by Hagedornfh
Other Employees Tagged: Courtney Chagnon, Silas Schreyack , The woman behind the team building the purchase package, who was in top of it all!
October 04, 2026
Tim was exceptional, he took care of all our needs. Great experience overall, thank you! Great experience overall, thank you! More
by Ljmulliganpt
Other Employees Tagged: Tim Bisson
October 04, 2026
We had a expedient purchasing experience at Grappone. We were in and out within a couple hours. We were in and out within a couple hours. More
by dylan.m.mcguinness
Other Employees Tagged: Tim Bisson
September 09, 2026
Folks were professional and friendly, process was clean and easy, price was a little high but likely reflected today’s inflated market. Car is in good clean condition. I’m happy with the purchase. and easy, price was a little high but likely reflected today’s inflated market. Car is in good clean condition. I’m happy with the purchase. More
by Info
Other Employees Tagged: Jenna Lavin , Tamar ah Deluca
September 05, 2026
This dealership is amazing! High quality service! Team members are very attentive and helpful and knowledgeable! High quality service! Team members are very attentive and helpful and knowledgeable! More
by mefkelley
Other Employees Tagged: Matt Collins, Jenna Lavin
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