Aroma Diffuser

FIG. 1 is a top, front and right side perspective view of an aroma diffuser showing our new design; FIG. 2 is a bottom, rear and left side perspective view thereof; FIG. 3 is a front, elevation view thereof; FIG. 4 is a rear, elevation view thereof; FIG. 5 is a left, side elevation view thereof; FIG. 6 is a right, side elevation view thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof. The broken lines shown in the drawings depict portions of the aroma diffuser that form no part of the claimed design.