Reviewed by the Tonebook color team · Updated June 2026
Check your inner-wrist veins in daylight (green = warm, blue/purple = cool), then hold gold vs silver near your face — the metal that makes your skin look healthier reveals your undertone. Mixed signals mean you're likely neutral. A fourth option, olive, is a green-grey cast neither test catches reliably.
Before diving into the full diagnostic, here's the fastest mental checklist. Each signal alone is imperfect; three or more pointing the same direction gives a reliable read.
| Test | Warm signal | Cool signal | Reliability |
|---|---|---|---|
| Wrist veins | Green or olive | Blue or purple | Moderate — skin thickness matters |
| Gold vs silver | Gold flatters | Silver flatters | Good |
| White paper near face | Skin looks peach/yellow | Skin looks pink/rosy | Good in natural light |
| Sun reaction | Tan easily, rarely burn | Burn before tanning | Weak alone — use as tiebreaker |
How to do the jewelry test correctly. Stand near a window in natural daylight — not fluorescent light, which adds a blue cast to everything. Hold one metal at a time against your jaw, not your wrist. Look for whether your skin appears brighter and more even, or dull and tired. The metal that makes you look healthier (even if it's not your style) is your undertone signal.
Neutral means the warm and cool signals balance each other. Neutral people often find that both gold and silver work, that their veins look blue-green, and that they get results pointing in opposite directions from different tests. This is not a failure of the tests — it's a real and distinct undertone category. Neutral skin suits both warm and cool colors, with a preference for the softer, less saturated versions of each.
Olive is a green-grey cast that can sit over skin of any depth, from fair to deep. It's distinct from warm and cool: standard tests miss it because olive isn't peach and isn't pink. Olive skin often looks slightly greenish or sallow under white LED lighting, but healthy and luminous in warm, golden light. The jewelry test usually points toward muted gold — not bright yellow gold — as most flattering. See the full guide at What is my undertone? for a breakdown of all four categories.
Undertone and flattering color are directly linked because the eye reads contrast between the colors you wear and the cast beneath your skin. When they harmonize, skin looks clear and bright. When they clash, you can look tired, sallow, or washed out.
Reach for: golden yellow, warm olive, terracotta, camel, warm coral, peach, burnt orange, warm red, warm brown, warm cream, khaki.
Avoid: icy pastels, cool blue-pinks, stark white, silver-grey.
Reach for: icy blue, rose, true red, burgundy, lavender, cool grey, soft white, navy, true pink, plum.
Avoid: orange, terracotta, warm yellow, camel, olive green, warm brown.
For specific palettes and hex codes, see Best colors for warm undertones and Best colors for cool undertones.
Undertone is the first of three axes in the Sci·ART 12-season system — originating from Carole Jackson's "Color Me Beautiful" and refined into 12 distinct sub-seasons. Knowing whether you're warm or cool narrows you to half of the 12 seasons immediately. The remaining two axes — value (how light or deep your overall coloring is) and chroma (how bright or muted) — determine your exact season within the warm or cool half.
| Undertone | Possible seasons |
|---|---|
| Warm | Bright Spring, Light Spring, True Spring · Soft Autumn, True Autumn, Deep Autumn |
| Cool | Light Summer, True Summer, Soft Summer · Deep Winter, True Winter, Bright Winter |
| Neutral | Can fall into any of the 12, depending on value + chroma; often a soft or true season |
| Olive | Most often Soft Autumn, True Autumn, or Soft Summer — but olive can appear across all 12 |
Example: A person with warm undertone, light-medium depth, and muted chroma is most likely a Light Spring or Soft Autumn. A warm undertone + very deep skin + high contrast points toward Deep Autumn. That's why undertone alone doesn't give you a season — it gives you a hemisphere, and you need all three axes to land on the right one.
Yes. This is called feature contrast, and it's common. Your hair might be a warm auburn while your eyes have a cool grey-green quality, and your skin sits neutral. Color analysis resolves this by reading all features together and finding the dominant signal — which is exactly why looking at one feature in isolation gives inconclusive results for so many people.
The most common confusion: dyed hair color. If your hair is color-treated to a warm blonde or a cool ash brown, it introduces a visual warm or cool signal that doesn't reflect your underlying undertone. For the most accurate at-home read, either pull your hair back fully or analyze your natural color. The undertone test guide covers this in detail.
Similarly, very heavy foundation or self-tanner can mask your skin's undertone signal. The vein color test is the only method that reads through surface product, though it has its own limitations on deep skin tones.
Rather than asking you to judge your own veins, Tonebook's AI samples real pixel data from a single selfie, corrects for the room's color temperature and exposure, and reads your skin's undertone — warm, cool, neutral, or olive — with a confidence label. It then places you in one of 12 Sci·ART-grounded seasons and builds a palette in your colors. The analysis is designed to work accurately across all Fitzpatrick skin types (I–VI), so deep and rich skin tones are read just as reliably as fair ones. The first full color analysis is free.
Tonebook reads undertone, depth, and chroma together — placing you in one of 12 seasons with a runner-up and confidence delta. Free first analysis. Works on every skin tone.
Get Tonebook for iPhoneYes — a purpose-built AI like Tonebook reads undertone directly from pixel data in a selfie, correcting for lighting. General photo tools won't do this reliably, but a dedicated color-analysis model will.
You're likely neutral — a balance of warm and cool with neither axis dominating. Many people are neutral-leaning-warm or neutral-leaning-cool, which is why a single at-home test often feels inconclusive. Olive is a fourth category: a green-grey cast that can sit over any depth.
Dyed hair can make you look warmer or cooler than your true undertone. For the most accurate read, analyze your natural hair color, or pull it back entirely and focus on your skin's undertone directly.
The warm seasons are Spring (Bright Spring, Light Spring, True Spring) and Autumn (Soft Autumn, True Autumn, Deep Autumn). The cool seasons are Summer (Light Summer, True Summer, Soft Summer) and Winter (Deep Winter, True Winter, Bright Winter). Neutral undertones can fall on either side depending on value and chroma.
Yes — this is called feature contrast. Your skin, eyes, and hair can each lean differently. Color analysis resolves this by reading all three together and finding the dominant undertone signal, which is why a selfie-based AI approach is more reliable than checking one feature in isolation.