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ACI Diamond Bar is now Keystone Education

Updated: Apr 25, 2018

Dear Parents and Students,

I am excited to announce that ACI Diamond Bar has a new name, Keystone Education.

For more than 20 years, feedback from students and parents has driven us to innovate and excel. Recent overhauls to education and increasing competitiveness in our local schools have made early preparation more important than ever. At the same time, we recognize that every student is unique, each requiring a personalized plan for success. We are experts at helping students learn the fundamentals to ensure that Elementary, Middle, and High School students succeed through college and beyond.

We have chosen the name “Keystone Education” to better reflect our vision: A solid foundation is the keystone to a student’s educational success.


Diane Sartor

Diamond Bar Director

ACI /Keystone Education

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😷 COVID-19 Update

Keystone Education will be opening the Fall 2020 semester with distance learning. Until further notice by the state of California, all schools in Los Angeles County cannot offer in-person instruction.

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660 N. Diamond Bar Blvd. #168 Diamond Bar, CA 91765

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