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Jonathan DeSimoni
Jonathan DeSimoni at Diamond Chevrolet of San Bernardino

Jonathan DeSimoni

Internet Director

Diamond Chevrolet of San Bernardino

909 W 21st Street
San Bernardino, CA 92405

Contact Me
4.9
130 Reviews

Dealership Experience

7 yrs

Industry Experience

23 yrs, 2 mos

Specialties & Trainings

Certified Top Performer 10+ Years

Chevrolet Mark of Excellence Award Winner 10+ Years

4.9

130 Reviews

Write a Review

130 Reviews of Jonathan DeSimoni

May 31, 2026

Dealership Rating
Employee Rating

good service good welcomed fast service and response updates on deals fast and good communication More

by Luis Rodriguez
Sales Price Transparency
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Ruben Bugarin Ramos, Duc Nguyen , Marvin

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Jun 01, 2026

Diamond Chevrolet of San Bernardino responded

Thank you for your kind words, Luis! I truly appreciate your feedback about the good service and communication you experienced. It's wonderful to hear that you felt welcomed and informed throughout the process. We look forward to assisting you again in the future! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

May 29, 2026

Dealership Rating
Employee Rating

I loved my treatment I got at this dealership everyone was so kind and accommodating Thank you for your kindness and support More

by caldwellcynthia59
Trade-in Experience
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Ruben Bugarin Ramos, Joseph Gotti, Gustavo Gonzalez, Dylan Maraj

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May 30, 2026

Diamond Chevrolet of San Bernardino responded

Thank you for your wonderful review, Cynthia! I’m thrilled to hear that you loved your experience at Diamond Chevrolet of San Bernardino. We strive to provide kind and accommodating service, and it's fantastic to know that we succeeded. We appreciate your support and look forward to welcoming you back for your next visit! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

May 19, 2026

Dealership Rating
Employee Rating

Great service! Dealership is changing to the right direction!! New management team!! Let's support our local Dealership!!! More

by hectorchevy22
Service Price Transparency
Workmanship
Service Time
Service Communication
Recommend Dealer
Yes

Other Employees Tagged: Luis Rojas, Ruben Bugarin Ramos, Duc Nguyen, Trish Wilson, Joseph Gotti, Gustavo Gonzalez, Dylan Maraj, Adrian Gonzalez

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May 20, 2026

Diamond Chevrolet of San Bernardino responded

Thank you for your kind words, Hector! I’m thrilled to hear that you had a great experience at Diamond Chevrolet of San Bernardino. I’m excited about the positive changes happening with our new management team and appreciate your support for our local dealership. Looking forward to serving you again in the future! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

April 30, 2026

Dealership Rating
Employee Rating

Salesman was really nice and helpful. I would recommend Diamond Chevrolet to a friend. Staff was all nice! More

by aaronvargas004
Service Price Transparency
Workmanship
Service Time
Service Communication
Recommend Dealer
Yes

Other Employees Tagged: Luis Rojas, Ruben Bugarin Ramos, Duc Nguyen, Trish Wilson, Joseph Gotti, Gustavo Gonzalez, Dylan Maraj, Adrian Gonzalez, Kevin Dominguez

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Apr 30, 2026

Diamond Chevrolet of San Bernardino responded

Thank you for your kind words, Aaron! I’m happy to hear that our team was able to assist you and that you would recommend Diamond Chevrolet of San Bernardino to others. We appreciate your support and look forward to seeing you again soon! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

April 26, 2026

Dealership Rating
Employee Rating

Tyler was a great help in getting what I needed when looking for a truck. More

by jmr369963
Sales Price Transparency
Trade-in Experience
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Tyler

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Apr 27, 2026

Diamond Chevrolet of San Bernardino responded

Thank you for your wonderful review! I’m happy to hear that Tyler was able to assist you in finding the perfect truck. At Diamond Chevrolet of San Bernardino, we strive to provide excellent service, and I’m glad you had a great experience. We look forward to seeing you again soon! Sincerely, Luis A Rojas - General Sales Manager lrojas@daliaauto.com 909-883-8833

April 16, 2026

Dealership Rating
Employee Rating

The service was much better and the representative was very helpful and respectful thank you More

by mariamarin080259
Service Price Transparency
Workmanship
Service Time
Service Communication
Recommend Dealer
Yes

Other Employees Tagged: Luis Rojas, Timothy Kubo, Elizabeth Ornelas, Duc Nguyen, Trish Wilson, Adrian Gonzalez , Jeramie Diaz, Jason Johnson

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Apr 16, 2026

Diamond Chevrolet of San Bernardino responded

Thank you for sharing your experience, Maria! I’m glad to hear you found the service at Diamond Chevrolet of San Bernardino to be much better and that our representative was helpful and respectful. Your feedback is greatly appreciated. We look forward to serving you again in the future! Sincerely, Hector Hernandez - Service Manager hhernandez@daliaauto.com 909-883-8833

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. More

by Tst4645
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 More

by donnafenn24
Sales Price Transparency
Purchase Time
Finance Experience
Recommend Dealer
No

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. More

by m.sosa87
Sales Price Transparency
Trade-in Experience
Purchase Time
Finance Experience
Recommend Dealer
Yes
Report | Print
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 More

by aleenuh
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

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