Judging quality
Look for saturated color, transparency and a clean termination. Tourmaline is often heavily included; eye-clean rubellite over a few centimetres is expensive for good reason.
Tourmaline
Lithium tourmaline in pink to raspberry red. Rubellite proper keeps its color under both daylight and artificial light, which is what separates it from lighter pink material.

Look for saturated color, transparency and a clean termination. Tourmaline is often heavily included; eye-clean rubellite over a few centimetres is expensive for good reason.
Durable but brittle. Avoid ultrasonic cleaning.
The Himalaya Mine in San Diego County shipped tons of pink tourmaline to the Chinese imperial court under the Dowager Empress Cixi.
Cultural history, recorded as tradition rather than as medical or scientific claim.
See it in person
Both rooms are open six days a week, and there is always someone happy to pull pieces out of the case so you can compare them under the light.