How to Say "assay" in Spanish
The Spanish word for “assay” is “contraste” — C1 level.
English → SpanishC1
nounC1formal
the testing of a metal to determine its ingredients and quality

Examples
Este anillo de oro tiene el contraste oficial.
This gold ring has the official hallmark.
El joyero revisó el contraste para verificar que fuera plata pura.
The jeweler checked the hallmark to verify it was pure silver.
Sin un contraste claro, no podemos vender la pieza como auténtica.
Without a clear hallmark, we cannot sell the piece as authentic.
Technical use
This meaning is almost always used as a countable noun, referring to the physical mark on the metal.
Related Translations
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