Unfortunately, this question is difficult to answer. Because the diamonds listed in Brilliance's inventory don't appear to be subject to any kind of exclusivity contract, it can take quite a long time for the company to fulfill orders. As I mentioned above, when I placed a test order, the diamond arrived too late for me to be able to review it. Some Brilliance customers have reported waiting weeks for their orders to be dispatched and delivered. Obviously, this is a massive annoyance if you want to propose on a certain date. While you might get lucky and have your order delivered quickly, you could also get unlucky and wait for several weeks before you receive anything.