Which of the following jewelry is permitted on hands when preparing food?

When preparing food, it is crucial to maintain high standards of hygiene and prevent contamination. A plain band ring is permitted because it has a smooth surface that does not trap food particles or bacteria, making it easier to maintain cleanliness. This type of ring does not have any protruding gems or intricate designs that could harbor contaminants.

Watches, bracelets, and rings with stones are generally discouraged because they can be more difficult to clean thoroughly, may trap food residues, and can also pose a risk of falling into food items during preparation. By allowing only simple, plain band rings, food safety practices are upheld, ensuring a safer food preparation environment.