Keystone Education (formerly ACI Diamond Bar)

Founded in 1995, Keystone Education is a private school with an unwavering commitment to provide students the tools, values, and resources they need to achieve academic excellence. We believe that an education should foster students' intellectual growth along with their social and emotional development. With trained eye and compassionate heart, our dedicated staff, counselors, and teachers nurture the dreams, intellectual curiosity, and goals of all who enroll. Our classroom environment is educational yet fun and motivates students to excel in school.