How to tell your undertone

Your undertone is the permanent hue sitting under your skin's surface: warm (golden, peachy), cool (pink, rosy, bluish), or neutral (a mix). It doesn't change when you tan — and it's the single most useful thing to know before you buy foundation, pick jewelry, or choose colors to wear near your face.

The tests, ranked by reliability

The jewelry test. In natural daylight, no makeup, hold a gold piece against one side of your face and a silver piece against the other. Don't look at the metal — look at your skin. The metal that makes your skin look clearer and brighter matches your undertone: gold for warm, silver for cool. If both look good, you're neutral.
The fabric test. Hold pure white cloth under your chin, then cream or ivory. If stark white flatters you, you lean cool. If cream and ivory look better, you lean warm. If you can't tell the difference, you're probably neutral.
The vein check. In natural light, look at the veins on the inside of your wrist. Blue or purple leans cool, green leans warm, a blue-green mix leans neutral. This is the most quoted test and the least reliable on its own — here's why.
Sun reaction. Burn easily and stay pink? Cool lean. Tan golden without burning? Warm lean. Burn a little, then tan? Neutral.
The compliment test. Think about what people notice: jewel tones and crisp white getting compliments points cool; earth tones, camel and gold points warm.
The foundation stripe. Swipe one warm-toned and one cool-toned foundation on your jawline. The one that disappears into your skin has your undertone.

When the tests disagree

Trust the jewelry and fabric tests over your veins. Veins are easily misread under indoor lighting, and surface redness — rosacea, acne, a workout flush — is not undertone. Judge the skin on your jaw and neck, never your cheeks.

Olive skin breaks the rules

Olive skin has a greenish-yellow cast that reads as neither clearly warm nor clearly cool, and it gets mistyped constantly. If every test comes back "can't tell," you may be olive. What works: muted, slightly warm-leaning shades; dusty and smoky tones. What fights you: icy pastels and neon brights, which turn chalky or garish against olive skin.

What to do once you know it

Your undertone unlocks three things immediately: foundation labels (W = warm, C = cool, N = neutral — full shade-matching guide), jewelry metals (gold vs silver test), and your color season, which builds your whole palette from your undertone plus depth and contrast: find your color season.

Questions women ask

Can your undertone change?

No. Tanning, aging and skincare change your surface color, but the undertone beneath stays the same for life.

What if my veins are impossible to read?

That's a result in itself — unreadable veins usually point to neutral or olive undertones. Use the jewelry and fabric tests instead; they're more reliable anyway.

Is olive an undertone?

Not exactly — it's a surface characteristic with a greenish cast that complicates the warm/cool read. Treat it as its own category rather than forcing it into warm or cool.

What's the difference between skin tone and undertone?

Skin tone is surface depth — fair to deep — and it changes with sun and seasons. Undertone is the permanent hue underneath: warm, cool or neutral.

How does BeU find my undertone?

BeU's AI color read corrects for your lighting first — the step DIY tests skip — then judges undertone, true skin depth, and natural hair and eye color from a phone scan, and places you in one of 12 seasons.