Noritake?

I'm not sure about this stemware although they caught my eye (again in op shop). The nice "ping" indicated they were of some quality, I'm guessing crystal. Each glass is quite dense black however has an amethyst glow when held up to light. Each piece is in perfect condition, has a gold ring around the rim and the "N" (?) mark on the base. I'm thinking Noritake because of the quality of them however haven't located that specific mark in my research. Unfortunately there is only 5 pieces, 3 x wine and 2 x champagne. Hope you like them.