The Diamond Horse Ranch was founded in 1850 by James R. and John Diamond. Their brother, George, joined them later. He had founded the Houston Post newspaper that shut down in 1995 and the assets were acquired by the Houston Chronicle.
The Butterfield Overland Mail Stage Line held the U.S. Mail contract for the first cross-country trek from St. Louis to San Francisco. One of the many stops in the nearly 700 mile stretch across the Lone Star State was the Diamond Station that was kept by John from 1858-1861. The Diamond brothers were political leaders and active in Texas Frontier Defense and masonry.
John and his wife Emeline are buried here. James is buried in Houston and George is buried in Oak Wood Cemetery, Whitesboro.