We used Unity Coins tinted in gold as wedding arrhae. Some, however, opt to just get newly-minted One Peso coins. Some have these plated in gold as gold coins look richer in photographs. Plus, since it's supposed to symbolize wealth and prosperity, having coins plated in gold seems a logical practice.
Some get coins in different denominations. Some use coins of different currencies, to have that added hope for the wealth of the world at your fingertips. Some buy old coins instead.
So if you're getting wed anytime soon, start figuring out which kind of coins you want to use and have them plated now, that gold is cheaper in the country.