This ring, purchased for 3800 yen at sassyangel (サッシーエンジェル), is made of surgical stainless steel 316L, a material known for its rust resistance. It's the type that can be worn while doing water work or taking a bath. The size is 11, and the color is pink gold. The stones are zirconia, set all the way around. I wore it about twice, and then stored it in a dark place in a plastic bag and drawstring pouch, just as it arrived. Official reviews praised it as "comparable to a real diamond eternity ring," and in fact, when worn in public, it was often mistaken for the real thing. It sparkles with a rainbow sheen when exposed to light.