  An ensemble of silicon vacancy centers in diamond (\ce{SiV-}) is probed using
two coherent spectroscopy techniques. Two main distinct families of \ce{SiV-}
centers are identified using multidimensional coherent spectroscopy, and these
families are paired with two orientation groups by comparing spectra from
different linear polarizations of the incident laser. By tracking the peak
centers in the measured spectra, the full diamond strain tensor is calculated
local to the laser spot. Such measurements are made at multiple points on the
sample surface and variations in the strain tensor are observed.
