Ishimitsu hesitates for just one moment before he replies.

"Well, you certainly can't go wrong with a diamond for an engagement ring. They are the classic choice. However, I would suggest that opals are not at all a childish option. It's a very popular stone among matriarchs, and it is associated with love, passion, fidelity, and protection. When you consider its symbolism, it's very interesting to me that the diamond is the standard stone for an engagement. Opal would seem a most fitting choice for the occasion."