Just for reference, here's a photo of two of the Kallio (rock) vases designed by Kai Blomqvist for Oy Kumela of Finland likely in the early seventies.
The amethyst vase is roughly square with distinct mould lines, the amber one is mostly round. Forgot to take measurements but Fire and Sea states 21cm for the amethyst so the amber will be about 24 or 25 cm tall.
Both are signed on the base "Kai Blomqvist"
and on the opposite side a somewhat difficult to decipher "Oy Kumela" (second photo).