We had a client recently who came in for an engagement ring knowing exactly what he wanted. He looked through our vast selection of rings, but ultimately decided to go the custom route. We had this ring hand-made for him in platinum. Hand-made pieces can be a bit more expensive than a ring made from a casting, but the quality is higher and the workmanship is finer.
In these photos, you can see the process of handmaking this engagement ring from start to finish.

Out of that block of platinum, the jeweler hand-carves it into a ring. The halo head, which will eventually hold the center diamond, is made as a separate piece.