A thin silver line at the rim of the goblets. The color may be Wistaria, which was made 1932-1938 according to Tom Felt's L.E. Smith Glass Co. 1st edition, p. 161. Or it could be Plum made in the 1980s. But a color comparison with the real glass and photos isn't possible.
The goblets measure inside of glass to inside of rim diameter exactly 3 inches, but outside in cm is 7.8, and inside 7.6cm. The base is 2-1/2 x 2-1/2 inches. (6.4cm)