The definition of compliant is obeying. An example of compliant used as an adjective is a compliant student which means a student who follows all of the rules. complying or tending to comply; yielding; submissive.
We're having the ring bearer wear a tux that is age appropriate. It costs about $70, everything included. Your tux shop should have these or be able to order them. Edited to add: A friend several years ago had a ring bearer in her wedding and dressed him in a shirt and tie instead of a tux.
So a $10,000 engagement ring would cost between $100 and $200 per year. These prices change significantly based on location (in Washington, DC, for example, it would cost $105 per year to insure a ring of that price, but in Los Angeles, the same ring would cost $200 per year to insure).