Judging quality
Judge by depth and evenness of color and by translucency held to light. Very cheap material is often pale, chalky and crossed with white feldspar. Some rose quartz shows a faint six-rayed star when polished into a sphere.
Quartz
The soft pink massive quartz that almost everyone recognises. Most rose quartz occurs as cloudy vein material rather than crystals; true terminated rose quartz crystals, mainly from Brazil, are genuinely rare and collectible.

Judge by depth and evenness of color and by translucency held to light. Very cheap material is often pale, chalky and crossed with white feldspar. Some rose quartz shows a faint six-rayed star when polished into a sphere.
Fades in strong sunlight over time. Rinse and dry; polished spheres benefit from an occasional soft buff.
Rose quartz beads have been found in Mesopotamian jewellery dated to around 7000 BCE, among the oldest worked gem material known.
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.