Onion

Size: Measured by diameter, ranging from small to jumbo.
Shape: Should be typical of the variety, usually round or slightly oval.
Firmness: Should be firm and hard, not soft or spongy.
Skin: Should be dry, papery, and intact, free from blemishes or discoloration.
Neck: The neck (where the leaves connect) should be tight and dry.
Freedom from Defects: Onions should be free from sprouting, decay, mold, insect damage, and mechanical injury.