"The stone is very small."

Translation: La ŝtono estas tre malgranda.

[thraenthraen]

Didn't try it, but would "estas malgrandega" mean the same thing, more or less?

[vikungen]

Yup. Good thinking.

[Kdhy11]

I tried "malgrandega" but it was rejected. I've now flagged it as "should be accepted"