it is a serious statement that the project has its own gold reserve with which it will be able to regulate the price and not let it fall below a certain level, but if you often use gold assets over time, there will not be a price to back up
Yes, Xaurum has a gold base (as far as you believe what the team says and their proofs). However this does not necessarily mean the price won't fall bellow a given price (the gold base price). In theory, it should be the case, because it is possible to melt Xaurs for their gold base equivalent (never done that myself), so it doesn't really make sense to sell for less that that. However, a holder may find it
troublesome to go through the process of melting, and might (panic-)sell for less than the gold base, no one/nothing can prevent this from happening.