This is a superb Art deco Vase.
This vase, called "LEMNA", has been created in 1934 by RENE LALIQUE.
White and patinated glass.
I didn't found any mark, as it happens sometimes on old pieces.
Hight: 18,5 cm
Diameter: 17,5 cm
Weight: 3,560 kilogrammes !!
Period: 1934 - 1937
A bit rare to find !
Here is a converter inches / cm to help you with the dimensions: