The choice of a jewel's colour is not simply a matter of taste; it is a matter of harmony. Colour theory, the science of colour coordination, applies to jewellery just as much as to clothing. Johannes Itten, a master of the Bauhaus, laid the theoretical foundations of warm and cool contrast in 1961, and these principles continue to guide jewellers today. Complexion is not the surface colour of the skin, which changes with a tan; it is the undertone, determined by melanin, haemoglobin, and carotene. A metal whose warmth aligns with your undertone creates a naturally luminous effect. The aim of this guide is to help you identify your undertone and choose the metals and stones that truly bring out your radiance.
Understanding your skin undertone: 4 simple methods
The wrist vein test is the quickest method: in natural light, observe the veins on your wrist. Greenish veins indicate a warm undertone, bluish veins a cool undertone, and a mixture of both a neutral undertone. The yellow gold and silver test: place a yellow gold piece and a silver (or white gold) piece side by side against your skin. The one that brightens your complexion without dulling it corresponds to your undertone.
The white and cream fabric test: drape a pure white fabric, then a cream or ivory fabric, close to your face. If pure white flatters you, your undertone is cool; if cream enhances your complexion, it is warm. The natural light test: observe your skin near a window, without makeup. A golden or peachy cast reveals a warm undertone, while a rosy or bluish cast indicates a cool undertone. As Carole Jackson noted in Color Me Beautiful (1984), the undertone never lies in natural daylight.
Warm undertone: yellow gold is your natural ally. The golden radiance of 18K yellow gold resonates with the warm pigments in your skin, creating an effect of luminosity and warmth. Rose gold, with its coppery undertones, is an excellent alternative for warm undertones. Mayuri vermeil offers the exact same warm tone as 18K yellow gold at a fraction of the price, making it ideal for discovering your colour before committing to a greater investment.

Cool undertone: white gold reveals your natural brilliance. 18K white gold and platinum, with their silvery reflections, pair beautifully with complexions that have rosy or bluish undertones. These cool metals create a luminous contrast that brightens the complexion without adding any warmth. 925 Silver works on the same principle.

Neutral undertone: the privilege of complete freedom. If your veins show a blend of green and blue, you have a neutral undertone. This is the wild card of colour theory: all metals suit you. Take this opportunity to mix yellow gold and white gold, or choose rose gold, which sits naturally between the two.
Which precious stone suits your complexion?
Emerald and warm undertones make a perfect pairing. The deep green of the Emerald, with its warm nuances, enhances golden and olive skin tones. Set in yellow gold, it creates a remarkable chromatic harmony. Blue Sapphire is the quintessential choice for cool undertones. Its intense, cool, deep blue magnifies rosy and fair complexions when mounted in white gold.
Ruby is the stone that suits everyone. Its universal red transcends undertone categories: it illuminates warm skin tones with passion and warms cool complexions with intensity. White Diamond and Black Diamond play on contrasts: the white diamond shines even brighter against deeper skin tones through the effect of contrast, while the Black Diamond creates a striking effect on fair complexions.
A guide by complexion: from very fair to deep skin tones
Very fair skin and rosy fair skin
Skin types I to III benefit most from cool metals: white gold and Platinum naturally enhance rosy undertones. Rose gold is also an excellent option, as its soft nuances blend beautifully with fair complexions without overpowering them. For gemstones, blue Sapphire and white diamond are your finest allies. Be mindful of deeply saturated yellow gold, which can create too stark a contrast on very pale skin; opt instead for a lighter yellow gold.

Medium skin and golden skin tones
Skin types III to IV represent the most versatile complexion. 18K yellow gold enhances the natural golden warmth of your skin, and rose gold adds an extra touch of warmth. An Emerald set in yellow gold is a particularly flattering choice. White gold also works beautifully, especially if your undertone leans neutral.

Matte, olive and deep skin tones
Skin types IV to VI are beautifully enhanced by yellow gold, which creates a spectacular radiance on deep and matte skin tones. This is the most luminous and most photographed combination in contemporary fine jewellery. A Ruby in yellow gold is breathtaking on ebony skin tones. Rose gold brings an elegant softness. White gold paired with a Black Diamond creates a striking graphic contrast.

Seasonal color analysis applied to jewellery
The four-season theory, developed by Suzanne Caygill in 1980, classifies individuals into four chromatic profiles. Applied to jewellery, it offers a practical framework for selecting metals and gemstones.
| Season |
Undertone |
Ideal Metal |
Recommended Stones |
| Spring |
Warm, light |
Yellow gold, rose gold |
Emerald, peridot, citrine |
| Summer |
Cool, soft |
White gold, silver |
Blue Sapphire, aquamarine, amethyst |
| Autumn |
Warm, deep |
Yellow gold, vermeil |
Ruby, Emerald, garnet |
| Winter |
Cool, intense |
White gold, Platinum |
Diamond, Sapphire, tanzanite |
| Undertone |
Ideal Metal |
Recommended Stones |
Best Avoided |
| Warm (green veins) |
Yellow gold, rose gold, vermeil |
Emerald, Ruby, citrine |
White gold alone (can look dull) |
| Cool (blue veins) |
White gold, Platinum, silver |
Sapphire, Diamond, tanzanite |
Deeply saturated yellow gold |
| Neutral (mixed veins) |
All metals |
All stones |
No restrictions |
Vermeil: the secret to finding your ideal color
Mayuri vermeil is 18K gold deposited over 925 Silver. It offers exactly the same warm tone as solid yellow gold, at a fraction of the price. It is the ideal option for warm undertones who want to build a collection without a major investment. The smart strategy: start with vermeil pieces to test the shapes and colours that suit you best, then invest in 18K gold for the styles you wear most. Vermeil is also hypoallergenic, a precious quality for sensitive skin.
Breaking the rules: unexpected combinations that truly work
The recommendations in this guide are reference points, not rules. Warm undertone with white gold: white gold set with an Emerald creates a striking contrast that works beautifully. The warm stone balances the cool metal. Cool undertone with yellow gold: a delicate yellow gold piece brings an unexpected touch of warmth to cool skin tones, especially when worn as a necklace close to the face.

Mixed metals is a strong trend: wearing yellow gold and white gold together creates a modern, sophisticated play of contrasts. Cultural context also matters: in certain traditions, the colour of a metal carries a significance that goes beyond colour theory. What matters most is wearing what makes you feel beautiful.
Frequently asked questions
How do you know if you have a warm or cool undertone?
The quickest test is the wrist vein test: in natural light, greenish veins indicate a warm undertone, bluish veins indicate a cool undertone, and a mix of both suggests a neutral undertone. You can also compare the effect of a yellow gold piece and a silver piece held against your skin.
Does yellow gold suit everyone?
Yellow gold is universally flattering, but it shines most brilliantly on warm undertones and medium to deep skin tones. On very fair skin with cool undertones, opt for yellow gold in subtle accents rather than statement pieces.
Which gold colour suits olive skin?
Medium skin tones are beautifully enhanced by 18K yellow gold, which resonates with the skin's natural golden pigments. Rose gold is an excellent alternative. Emerald and Ruby set in yellow gold are particularly luminous combinations.
Which jewellery suits dark skin?
Deep and ebony skin tones are magnified by yellow gold and rose gold, which create a spectacular, luminous contrast. Ruby set in yellow gold is striking. White diamond produces a remarkable brilliance effect through contrast. All metals work beautifully, but yellow gold remains the most photographed choice.
Which skin tone suits rose gold?
Rose gold suits the majority of skin tones thanks to its balance between warm and cool hues. It is particularly flattering on fair to medium complexions and neutral undertones. On deeper skin tones, it brings an elegant softness.
Which gemstone suits fair skin?
Fair skin with cool undertones is beautifully enhanced by blue Sapphire, Diamond, and aquamarine set in white gold. Fair skin with warm undertones pairs beautifully with Emerald and peridot in yellow gold or rose gold.
Which skin tone suits vermeil?
Vermeil, yellow gold over 925 Silver, is ideally suited to warm and neutral undertones. Its golden hue is identical to that of 18K yellow gold. It is a perfect entry point for testing your metal harmony before investing in solid gold.
How to mix metals without a style misstep?
The key is to create a visual thread: the same jewellery style in two different metals, or a two-tone piece that bridges them both. Wear the dominant metal, the one that corresponds to your undertone, in greater proportion, and use the second metal as an accent.
Which jewellery colours suit blondes?
Forget the rule that says "gold is for blondes": it is simply a myth. Undertone matters far more than hair colour. A blonde with cool undertones will be beautifully enhanced by white gold, while a blonde with warm undertones will radiate in yellow gold.