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Jonathan DeSimoni

Overview Reviews (124) Inventory (146)

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Jonathan DeSimoni

Internet Sales / Fleet Manager

Diamond Chevrolet of San Bernardino

909 W 21st Street
San Bernardino, CA 92405

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4.9

124 Reviews

Overview Reviews (124) Inventory (146)

Dealership Experience

6 yrs, 7 mos

Industry Experience

22 yrs, 9 mos

Specialties & Trainings

Certified Top Performer 10+ Years

Chevrolet Mark of Excellence Award Winner 10+ Years

4.9

124 Reviews

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This rating includes all reviews, with more weight given to recent reviews.

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124 Reviews of Jonathan DeSimoni

February 16, 2026

Dealership Rating

Employee Rating

Jonathan was very professional. Answered our questions. and made us feel at ease. The overall experience of purchasing the car was very good. Would recommend him and the dealership. Answered our questions. and made us feel at ease. The overall experience of purchasing the car was very good. Would recommend him and the dealership. More

by Tst4645

Verified Customer

Sales Price Transparency

Purchase Time

Recommend Dealer

Yes

Other Employees Tagged: Derek

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Feb 16, 2026 -

Diamond Chevrolet of San Bernardino responded

Thank you for your awesome review! I'm happy to hear that Jonathan provided you with a professional and comfortable experience during your car purchase at Diamond Chevrolet of San Bernardino. Your recommendation means a lot to us. We look forward to serving you again in the future! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

January 29, 2026

Dealership Rating

Employee Rating

I feel taken advantage of of by the financial dept. being told mid leading things regarding the gap insurance as they took it upon them selves to delete it from my sales contract saying there’s no nee being told mid leading things regarding the gap insurance as they took it upon them selves to delete it from my sales contract saying there’s no need for it as I had put 8000 down payment, also they added un nessasary warranty’s adding up to over 6000 dollars and when I ask about them I was told they add them to every sale making me believe I had no choice! I’m really upset and feel like I was taken !!! Watch out people u could b next!!! Derick shame on u!!! The rating for u is 0 More

by donnafenn24

Verified Customer

Sales Price Transparency

Purchase Time

Finance Experience

Recommend Dealer

Other Employees Tagged: Luis Rojas

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Feb 01, 2026 -

Diamond Chevrolet of San Bernardino responded

We would like the opportunity to speak with you directly regarding your experience.

January 26, 2026

Dealership Rating

Employee Rating

Amazing staff, very helpful, knowledgeable found what I was looking for for my family and I. was looking for for my family and I. More

by m.sosa87

Verified Customer

Sales Price Transparency

Trade-in Experience

Purchase Time

Finance Experience

Recommend Dealer

Yes

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Jan 27, 2026 -

Diamond Chevrolet of San Bernardino responded

Thank you for your feedback! I am glad to hear that our staff at Diamond Chevrolet of San Bernardino was able to assist you in finding the perfect vehicle for your family. We look forward to serving you again in the future! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

January 14, 2026

Dealership Rating

Employee Rating

Gotti made it terrible, management jumped in. Jonathan jumped in. Jonathan knew what id like, and what would be affordable. Best experience ever Jonathan jumped in. Jonathan knew what id like, and what would be affordable. Best experience ever More

by aleenuh

Verified Customer

Recommend Dealer

Yes

Other Employees Tagged: Jonathan DeSimoni

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Jan 15, 2026 -

Diamond Chevrolet of San Bernardino responded

Thank you for your feedback! I'm glad to hear that Jonathan and our management team were able to assist you and provide a great experience at Diamond Chevrolet of San Bernardino. Your satisfaction is important to us, and we appreciate you sharing your thoughts. We hope to see you again soon! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

January 07, 2026

Dealership Rating

Employee Rating

No Okay Good experience, still waiting for My tinted windows Have him call me to set it up windows Have him call me to set it up More

by jimmarabella

Verified Customer

Recommend Dealer

Yes

Other Employees Tagged: Jonathan DeSimoni

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Jan 08, 2026 -

Diamond Chevrolet of San Bernardino responded

Thank you for your review, Jim! I appreciate your feedback regarding your experience at Diamond Chevrolet of San Bernardino. We understand that you're still waiting for your tinted windows, and we want to ensure everything is set up for you. Please feel free to reach out to us directly, and we will be happy to assist you in scheduling that. Looking forward to hearing from you soon! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

December 25, 2025

Dealership Rating

Employee Rating

Jonathan , And Elizabeth helped me out greatly Helped me out with all questions I asked out with all questions I asked More

by suavecitom

Verified Customer

Recommend Dealer

Yes

Other Employees Tagged: Jonathan DeSimoni

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Dec 26, 2025 -

Diamond Chevrolet of San Bernardino responded

Thank you for your wonderful review! I'm thrilled to hear that Jonathan and Elizabeth were able to assist you effectively at Diamond Chevrolet of San Bernardino. We appreciate your feedback and hope to see you again soon! Best, Michael Salas msalas@daliaauto.com

December 07, 2025

Dealership Rating

Employee Rating

Excellent customer service Outstanding customer service made the process go smoothly ?? Outstanding customer service from Jonathan and team, made the process go smoothly. made the process go smoothly ?? Outstanding customer service from Jonathan and team, made the process go smoothly. More

by jess562cali209

Verified Customer

Recommend Dealer

Yes

Other Employees Tagged: Jonathan DeSimoni

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Dec 08, 2025 -

Diamond Chevrolet of San Bernardino responded

Thank you, Jess! I truly appreciate your kind words about the outstanding customer service you received from Jonathan and our team at Diamond Chevrolet of San Bernardino. I'm thrilled to hear that we made the process smooth for you. We look forward to seeing you again for any future needs! Best, Michael Salas msalas@daliaauto.com

November 10, 2025

Dealership Rating

Employee Rating

They were very helpful and gave me what I wanted. Jonathan is a great salesman. He called me as soon as I messaged him online. Jonathan is a great salesman. He called me as soon as I messaged him online. More

by LAKERS924

Verified Customer

Recommend Dealer

Yes

Other Employees Tagged: Jonathan DeSimoni

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Nov 11, 2025 -

Diamond Chevrolet of San Bernardino responded

Thank you for your wonderful review! I'm thrilled to hear that you had a positive experience at Diamond Chevrolet of San Bernardino and that Jonathan was able to assist you effectively. Your satisfaction is our priority, and we appreciate your kind words. We look forward to seeing you again soon! Best, Michael Salas msalas@daliaauto.com

November 06, 2025

Dealership Rating

Employee Rating

Very professional. Nice. Not pushy. Very helpful They were very professional. Made the entire process easy. They did not push and was honest about what they offered. No Nice. Not pushy. Very helpful They were very professional. Made the entire process easy. They did not push and was honest about what they offered. No hidden surprises More

by deryl1960

Verified Customer

Recommend Dealer

Yes

Other Employees Tagged: Jonathan DeSimoni

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Nov 07, 2025 -

Diamond Chevrolet of San Bernardino responded

Thank you for your wonderful review! I'm thrilled to hear that you found Diamond Chevrolet of San Bernardino to be professional and helpful throughout the process. Our team strives to create a transparent and comfortable experience for our customers, so it’s great to know that we met your expectations. We appreciate your feedback and look forward to seeing you again soon! Best, Michael Salas msalas@daliaauto.com

October 19, 2025

Dealership Rating

Employee Rating

They came with a deal that was I couldn’t refuse. Thanks to Timothy for the help to make this happen for us Thanks to Timothy for the help to make this happen for us More

by Bumindabak02

Verified Customer

Sales Price Transparency

Purchase Time

Finance Experience

Recommend Dealer

Yes

Other Employees Tagged: Timothy Kubo , Antonio Diaz

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Oct 19, 2025 -

Diamond Chevrolet of San Bernardino responded

Thank you for your wonderful review! I'm thrilled to hear that you found a deal you couldn't refuse at Diamond Chevrolet of San Bernardino. A special shoutout to Timothy for his assistance in making your experience positive. We look forward to serving you again in the future! Best, Michael Salas msalas@daliaauto.com

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