Surface tone vs. undertone
Your surface tone is what you'd name your skin at a glance — fair, olive, tan, deep. It shifts with sun, season, and circulation. Your undertone is the subtle cast beneath it that stays steady. Two people can share the same surface tone yet have opposite undertones, which is why the same lipstick can look fresh on one and muddy on the other.
Most people lean one way; a large share are genuinely neutral, sitting close to the middle. There's no "better" undertone — each one has a gorgeous range of colors.
Four at-home checks
None of these is foolproof on its own. Do them in daylight near a window, with no makeup, and look for agreement across two or three before you trust the result.
1. The vein test
Look at the veins on the inside of your wrist. Greenish veins suggest a warm undertone; blue or purple suggests cool; if you genuinely can't decide, that points to neutral.
2. Gold vs. silver
Hold gold jewelry to your face, then silver. If gold makes your skin glow, you're likely warm; if silver looks crisper and cleaner, you're likely cool. If both look fine, lean neutral.
3. White vs. cream
Drape a pure bright-white cloth under your chin, then a soft cream or ivory. Cool undertones tend to look fresh against pure white; warm undertones usually look healthier against cream.
4. How you react to sun
A loose hint, not a rule: skin that tans easily and rarely burns often runs warmer, while skin that burns and pinks up before it tans often runs cooler.
What to do with your answer
Once you know your undertone, you've solved half the puzzle. Warm undertones glow in golds, corals, olive, and warm reds; cool undertones come alive in blues, berry, emerald, and true white; neutrals get to borrow from both. Undertone is also the first of the three axes that define your full season.