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Radial mass-to-light ratio gradients cause the half-mass and half-light radiiof galaxies to differ, potentially biasing studies that use half-light radii.Here we present the largest catalog to date of galaxy half-mass radii at z > 1:7,006 galaxies in the CANDELS fields at 1.0 < z < 2.5. The sample includes bothstar-forming and quiescent galaxies with stellar masses 9.0 < log(M_* /M_\odot) < 11.5. We test three methods for calculating half-mass radii frommulti-band PSF-matched HST imaging: two based on spatially-resolved SEDmodeling, and one that uses a rest-frame color profile. All three methodsagree, with scatter <~0.3 dex. In agreement with previous studies, mostgalaxies in our sample have negative color gradients (the centers are redderthan the outskirts, and r_e,mass < r_e,light). We find that color gradientstrength has significant trends with increasing stellar mass, half-lightradius, U-V color, and stellar mass surface density. These trends have not beenseen before at z>1. Furthermore, color gradients of star-forming and quiescentgalaxies show a similar redshift evolution: they are flat at z>~2, then steeplydecrease as redshift decreases. This affects the galaxy mass-size relation. Thenormalizations of the star-forming and quiescent r_mass-M_* relations are10-40% smaller than the corresponding r_light-M_* relations; the slopes are~0.1-0.3 dex shallower. Finally, the half-mass radii of star-forming andquiescent galaxies at M_* = 10^{10.5}M_\odot only grow by ~1%$ and ~8% betweenz~2.25 and z~1.25. This is significantly less than the ~37% and ~47% sizeincreases found when using the half-light radius.

Half-mass radii for ~7,000 galaxies at 1.0 < z < 2.5: most of the evolution in the mass-size relation is due to color gradients