Size: Coriander seeds are typically 2-3 mm in diameter, about the
size of a small peppercorn.
Shape: They have a rounded shape with slight indentations on either
side.
Color: The color can vary from light brown to yellowish-brown, with
some seeds even having a greenish tinge.
Texture: Coriander seeds should be hard and have a slightly rough
texture.
Freshness: Fresh coriander seeds have a vibrant color, strong aroma,
and a pungent flavor. Avoid dull-colored or weak-smelling seeds, as they may
have lost their potency.