The diamond that Xiao Xiao tossed out was very tiny, no bigger than the tip of a needle. If singled out, it wouldn't look much different from ordinary glass debris; it held no decorative significance.
But now, when it falls into the claws of Dangdang Ears, it's a different story. According to a mouse's ten-centimeter height, compared to a human's one hundred and seventy centimeters, a needle-tip-sized diamond in human eyes would have to enlarge by fifteen to sixteen times to match the size in a mouse's perspective.
Of course, even if it enlarged by fifteen or sixteen times, it would only change from the size of a needle tip to the size of a grain of rice, still not particularly significant.
However, a rice-sized diamond was already very valuable to the Mouse King.