Storing vis in objects

Hi all,
the core book contains rules for storing vis in normal objects. An object can hold as much vis as the Size and Material allows.

Can you store different types of vis in an object? e.g. I have a gold ring (10 * 1 = 10 pawns) and I put into it 5 pawns of Terram and 5 pawns of Ignem.
Can you use the rules for a composite object? e.g. a gold ring with a diamond and a saphire.

I would say that a single discrete item can only hold one. So a plain gold ring might contain only one type of vis. Now, if you add a stone on top of it you could use the stone as a second item. I see no problem at all with that. You could even use a chain and store different types of vis in each link.