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We report on rubidium vapor-cell Rydberg electromagnetically inducedtransparency (EIT) in a 0.7~T magnetic field where all involved levels are inthe hyperfine Paschen-Back regime, and the Rydberg state exhibits a strongdiamagnetic interaction with the magnetic field. Signals from both$^{85}\mathrm{Rb}$ and $^{87}\mathrm{Rb}$ are present in the EIT spectra. Thisfeature of isotope-mixed Rb cells allows us to measure the field strength towithin a $\pm 0.12$\% relative uncertainty. The measured spectra are inexcellent agreement with the results of a Monte Carlo calculation and indicateunexpectedly large Rydberg-level dephasing rates. Line shifts and broadeningsdue to small inhomogeneities of the magnetic field are included in the model.

Paschen-Back effect and Rydberg-state diamagnetism in vapor-cell electromagnetically induced transparency