Bradley Gent has dated this piece to the 1930s.
Introduced in 1931
Marcilhac page ref:281
Alexandrite glass is dichroic meaning two colours.

In daylight the glass appears a lilac colour and under artificial light it is a turquoise colour
Rene Lalique only made a few examples of Alexandrite glass
The base of this ashtray is also like no other having facet cuts
Stenciled mark R Lalique
The condition is very good with no damage or faults
Bradley Gent has dated this piece to the 1930s.
Specialising in rene lalique glass
You can view the stock and full dealer information on the Bradley Gent Profile Page