Don't worry, I'm not leaving. Ignore that message, it's automatically generated and wasn't sent by me. The site overlords deem it time for someone else to step in if I don't give you an answer within a specified (by them, not me) time. Sorry about that.
So your vase is not Nippon, though I can understand those dots and raised enamels are certainly reminiscent, but the Japanese from this era stuck to porcelain rather than glass. Yours is what used to be described as "enameled Venetian glass" until folks realized it wasn't made in Venice at all, not even close, not even in Italy, but rather in another great center of enameled glass making in Europe: Bohemia -which is now the Czech Republic.
It is very like the output of one particular Bohemian art glass maker, namely, Moser Glass, much of which is unmarked and there were few other than Moser glass craftsmen who had the skill to do that enamel decoration. In order to fuse the gold and white raised paste enamel flowers to the glass required putting the piece back into the furnace. The enameling point of the decoration was almost the same as the melting point of the glass, so re-firing could mean the catastrophic melting of the whole thing after hours of meticulous decorating.
This vase shape with its bulbous bottom and long gently flared neck, combined with the Art Nouveau style of the bramble flowers, vining boldly the full length of the piece, dates it to the early 1900s, circa 1910 - 1920s.
This is a very decorative vase and the amethyst is one of the most sought after Bohemian glass colors. I would give it an auction value in the range of $250 - $350.
So it therefore has a full retail/replacement/insurance value of $700.
A magnificent piece! And a great survivor, defying the hazards of gravity and dusting for a hundred years!
I do hope this helps!