Rubellite Tourmaline. Rubelite Tourmaline

Structure : Trigonal
Hardness : 7.5
Specific Gravity : 3.06
Refractive index : 1.62 - 1.6
Doubly Refracting (bi-refraction) : 0.018

Have a question for you.
How do you define a Rubellite Tourmaline? From what I can find: the main difference between Rubellite and Pink Tourmaline or Red Tourmaline: Rubellite does not change color under artificial light. In contrast to this, the color of most other pink and red Tourmalines shows a more or less noticeable brownish hue in artificial light.
I have a ring with very large pinkish-red tourmaline, which has color even more saturated than this stone you are selling. When I am asked by my customers, if it is Rubellite, I cannot say Yes, because it changes color slightly under artificial light, the same as your stone.
There is quite a difference in price between Red Tourmaline and Rubellite.
So what is your stone?
Thank you.