The Los Angeles County Coroner’s office said Mark S. Buell died at his home in La Palma, Calif., of natural causes.
He was 92.
Buell’s company, Buella Jewelers, opened in 1933 in Los Angeles.
It was the first major jewelry company in the United States, with more than 100 employees.
Buesell’s death was the latest in a string of workplace deaths in California in recent years.
The California Occupational Safety and Health Administration said a woman died at her West Hollywood home in July after a heart condition.
That same month, a man died after he fell to the ground in his California home.
In April, a former California Assemblywoman died after falling and injuring her head and chest while working as a receptionist at the Assembly Hall.
The woman was 62.