How to Say "diamonds" in Spanish
The most common Spanish word for “diamonds” is “diamantes” — use 'diamantes' when referring to diamonds as precious stones, as part of jewelry, or in a more general, valuable context..
diamantes
dee-ah-MAHN-tays/djaˈmantes/

Examples
Ella heredó un collar con incrustaciones de diamantes muy grandes.
She inherited a necklace encrusted with very large diamonds.
Necesitas más diamantes en tu mano para ganar la partida.
You need more diamonds in your hand to win the game (of cards).
Los diamantes son los minerales más duros conocidos.
Diamonds are the hardest known minerals.
Plural Noun Rule
Since the singular word 'diamante' ends in a vowel ('e'), you form the plural by simply adding '-s' to the end.
Gender Confusion
Mistake: “La diamante”
Correction: El diamante (singular) or Los diamantes (plural). Even though it ends in '-e', it is a masculine word.
brillantes
bree-YAHN-tehs/bɾiˈʎantes/

Examples
El collar estaba adornado con pequeños brillantes.
The necklace was adorned with small diamonds.
El joyero mostró los brillantes más grandes que tenía.
The jeweler showed the largest jewels (diamonds) he had.
Noun vs. Adjective
When used as a noun, 'brillantes' refers specifically to the precious stones. When used as an adjective, it describes the quality of shining (e.g., 'zapatos brillantes' - shiny shoes).
Diamantes vs. Brillantes
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