There are a huge number of factors contributing to Mokume Gane's popularity. The first is that it's extremely versatile because you can choose what other metals to combine it with. This lets you have some control over the color, shape, and size of your band so that you can showcase your individual tastes when wearing it.
Mokume Gane rings make for extremely romantic bands as well because of their one-of-a-kind nature. Just as your love is unique and there's nothing like it in the world, each Mokume Gane ring is completely distinct from others. The metals will never fuse together in the kiln in the same pattern twice. Using Mokume Gane wedding rings is a statement that you'll always be true to the unique beauty of your relationship.
Mokume Gane rings also change over time, much like a relationship does. Each ring develops a unique luster as it ages. The result is different than it once was, but it's no less beautiful- it holds a beautiful luster and polish for an entire lifetime (and beyond). It is extremely durable and scratch-resistant due to the combination of high-profile metals.
These men's band rings are also perfect for women because they come in a multitude of sizes. You can purchase a His & Hers Mokume Gane set for under $1,000- a much lower price than a single wedding ring would be if you chose a standard gold-and-diamond one. Plus, since the ring won't lose its luster or chip/bend as gold or sterling silver bands would, it's a much better overall investment.