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Invariable color adjectives that never change

In French, adjectives normally agree in gender and number with the noun they describe. If you have a plural feminine noun, the adjective usually gets an extra e and an s. However, color words derived from physical objects, like fruits, drinks, or metals, break this rule completely.

Words like orange, marron, or or are invariable. They never change their spelling, no matter what they describe. This quirk often trips up English speakers who expect all adjectives to show agreement.

Word list
cafémA1 coffee des vestes café chocolatmA1 chocolate des pantalons chocolat marronA1 brown des chaussures marron mielmA1 honey des yeux miel orangeA1 orange des t-shirts orange argentmA2 silver des montres argent bronzemA2 bronze des médailles bronze champagnemA2 champagne des robes champagne citronmA2 lemon des robes citron ormA2 gold des bagues or sablemA2 sand des pantalons sable saumonmA2 salmon des chemises saumon briquefB1 brick des murs brique cacaomB1 cocoa des murs cacao cerisefB1 cherry des lèvres cerise crèmefB1 cream des murs crème framboisefB1 raspberry des jupes framboise noisettefB1 hazelnut des yeux noisette olivefB1 olive des coussins olive pêchefB1 peach des robes pêche pistachefB1 pistachio des chaussettes pistache prunefB1 plum des pulls prune vanillefB1 vanilla des murs vanille abricotmB2 apricot des rideaux abricot aciermB2 steel des yeux acier auberginefB2 eggplant des canapés aubergine cannellefB2 cinnamon des pulls cannelle caramelmB2 caramel des sacs caramel châtaignefB2 chestnut des cheveux châtaigne cuivremB2 copper des cheveux cuivre lavandefB2 lavender des draps lavande marinefB2 navy des pulls marine moutardefB2 mustard des manteaux moutarde rouillefB2 rust des feuilles rouille tabacmB2 tobacco des bottes tabac ambremC1 amber des yeux ambre coquelicotmC1 poppy des écharpes coquelicot émeraudefC1 emerald des yeux émeraude ivoiremC1 ivory des robes ivoire lilasmC1 lilac des robes lilas paillefC1 straw des gants paille platinemC1 platinum des cheveux platine rubismC1 ruby des lèvres rubis soufremC1 sulfur des fleurs soufre corailmC2 coral des lèvres corail safranmC2 saffron des robes safran saphirmC2 sapphire des yeux saphir
How it works

When a noun is used to describe a color, it acts as an invariable adjective. You simply place the noun after the word it describes, just like a normal adjective, but you never add an e or an s. For example, marron and orange are historically nouns, so they stay frozen even when describing plural or feminine nouns.

Il porte des chaussettes orange.
(He is wearing orange socks.)
Elle a de beaux yeux marron.
(She has beautiful brown eyes.)
Food and nature

Foods and plants are a massive source of these invariable colors. You can use everyday nouns like chocolat, café, crème, noisette, saumon, and olive to describe the color of clothes, eyes, or furniture. No matter how many items you are describing, the color word remains singular.

J'adore tes gants chocolat.
(I love your chocolate-colored gloves.)
Ils ont acheté des chaises crème.
(They bought cream-colored chairs.)
Mon frère a les yeux noisette.
(My brother has hazel eyes.)
Metals and materials

Metals work exactly the same way. You can use or, argent, and bronze to describe things without ever making them plural or feminine.

Elle porte des boucles d'oreilles or.
(She is wearing gold earrings.)
Il a vu deux voitures argent.
(He saw two silver cars.)
Watch out

There is an important catch. A few colors that originally come from nouns have been used as adjectives for so many centuries that they now act like regular adjectives. The most common exception is rose, which does take an s in the plural. You might also see this regular agreement with words like mauve or pourpre.

Additionally, be careful to distinguish between the invariable noun used as a color and its true adjective form. For example, or is invariable, but the adjective doré agrees normally. The same applies to argent versus the regular adjective argenté.

J'ai acheté trois chemises roses.
(I bought three pink shirts.)
Elle préfère les montres dorées.
(She prefers golden watches.)
Summary

As a rule of thumb, if a color in French is also the name of a fruit, a food, or a metal, it is invariable. It will never take an extra e or s to agree with the noun it describes.