When the new 10 rupee coin was launched, a friend of mine said, won't it be cool if core and the outer ring of the coin were detachable, then you could use it as 10 rupee coin or two coins of 5 bucks each. Now that would have been cool indeed. Wonder what would be the implications of doing that. What comes to my mind are the smaller packs of chocolates and biscuits that are part of larger party pack that come with "Not to be sold loose/individually" and what a shopkeeper would say "Sahab, we take the core only for 4 bucks the ring is bigger and goes for 6 bucks.