I remember once buying some ancient Roman dice, and the store put the tiny dice, about the size of the tip of your pinky fingernail, in a small aluminum case.
These small aluminum cases were originally used to store mechanical watch parts. They come in four different sizes. Perfect for storing stones, accessories, and other small parts. They could also be used as a case for small gifts.
Watch parts storage case φ1.8cm
Watch parts storage case φ2.4cm
Watch parts storage case φ3cm
Watch parts storage case φ3.3cm
Watch parts storage case φ1.8cm
Watch parts storage case φ2.4cm
Watch parts storage case φ3cm
Watch parts storage case φ3.3cm