I like the Gamma idea if it's completely separate and doesn't leverage or borrow against the gold.  If the gold is used as any kind of financial backing for Gamma and not just added use then I'm out.  If you take real money ie gold with no counterparty risk and borrow against it ruins the whole safety of the gold.  Please have gamma be 100% separate so if it fails not a single gram of gold is in jeopardy.  Without this separation you will have killed Xaurum.