I posted my ring on the show us your rings thread. But, mine is a mokume gane engagement rings...
Mokume Gane, or Wood Grain Metal, is the ancient Japanese technique of forging precious metals into distinctive swirling patterns. There is no mold. Mine uses sterling silver, 14K white gold, paladium, and platinum. It has a color changing sapphire (blue in natural light turning purple in flouresent light) with diamonds on either side.
Our bands will match my engagement ring's band. If you are curious, the site where my FI ordered my ring from can be found at Unique Designer Mokume Engagement rings - Hand Crafted at Krikawa