Snowflake silver round holder

I started giving out silver coins at Christmas to the nieces and nephews.  I made this ornament to fit them to make the gift a bit more fun.  

It should fit a standard 1 troy ounce round, but mints can be a bit different.   The opening is 39mm which is pretty standard for silver rounds. 

The coin is pressure fit to stay in.  The front has a small lip to stop the coin from popping out, so it must be inserted from behind.