Never touch the stones, always pick up the crown with two hands to place on your head or in a crown case. Never pick up a crown with one hand. The oils in your hands can dull the stones. Grasp the crown between the thumb and 4 fingers at the top and bottom edge of the rhinestone chain. This will keep your stones sparkling forever.
A crown should be carried upright, not on its side, when possible.
Always have your hair done a couple of hours before wearing the crown, hair lacquer, gels, mousse, etc, are the number one jewelry enemy, even on gold.
Store your jewelry in its original packaging in a cool dry place away from direct sunlight.