- Resides in Hollywood, California. He charges $120 an hour to teach self-defense. He offers free classes at North Hollywood park on Tuesday afternoons at 3:00p.m. across from Gold's Gym. (February 2004)
- Harold Diamond aka Harold Roth has been reported as having a kickboxing record of 17-0-0 (17 knockouts) ; yet, he has two confirmed losses to Steve Shepherd. Also, Diamond is reported to have an undefeated (67-0-0) full-contact karate record, but he has at least one documented loss to Germany's Peter Harbrecht.
- In the mid 1970s, Diamond (Roth) fought on two professional boxing cards in Miami Beach, Florida. His matches were kickboxing bouts and Diamond (aka Roth) won both by first round knockouts.
- In 1975, Roth defeated Glen McMorris in one of his biggest victories in Karate.
- In 1977 at the WAKO World Championships in West Berlin, Germany, Roth lost in the finals to Peter Harbrecht in full-contact karate.
- In 1979 in Tampa, Florida, Roth came in second to Franz Haller at the WAKO World Championships.
- In February 1975 in Tampa, Florida, Roth lost by third round technical knockout to future world middleweight kickboxing champion Steve Shepherd.
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