An example of an object the size of a Millimeter (mm) is the tip of your pencil. An example of an object the size of a Centimeter (cm) is the fingernail.
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Your answer depends on the cut of the stone and what about the stone you are measuring.
Objects are congruent if they are the same size and shape, or an exact reflection of one another. If objects are not congruent, they are dissimilar in either size, shape or both.
Congruent
The size of these two objects is exactly the same: 5mm.
The circumference of a circle with a 10 millimeter diameter is about 31.42 mm