Quartz
Yellow to golden quartz. Genuinely natural citrine is uncommon and tends toward a smoky lemon or champagne tone; the vivid orange 'burnt' material widely sold is heat-treated amethyst, which is a legitimate product but a different thing entirely.
Natural citrine is usually pale, evenly colored and often slightly smoky. Heat-treated amethyst shows white bases, orange-red saturation concentrated at the tips, and a characteristic crackled texture. We label the difference on every piece in the room.
Avoid long sun exposure, which can pale the color. Clean with water and a soft cloth.
Citrine has carried associations with merchant prosperity since at least the Renaissance, when it was set into trade rings across Europe.
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.