This is the 616th most frequent Vietnamese word.
viên
"Viên" in Vietnamese refers to a "sphere," "pill," or "member/official," depending on context.
In this sentence, 'viên' refers to a single spherical or small solid object, typically used in contexts like medicine for pills or tablets.
Tôi vừa uống một viên thuốc.
I just took one pill.
Here, 'viên' is part of the compound word 'viên chức,' referring to a staff or official, denoting a professional title.
Cô ấy là một viên chức chăm chỉ.
She is a hardworking officer.
In this case, 'viên' is used as a classifier for small, solid, or spherical objects, here referring to the diamond.