This Millefiori Heart Ring is made of nickel-free .925 sterling silver and features beautiful pink Millefiori heart shape glass detailing. Millefiori, which literally means âa thousand flowersâ, is a type of Murano glass that has been incorporated with various layers of colors to create a beautiful flower-like pattern. All Millefiori of Venecia jewelry is completely handmade of authentic Murano glass, which has been around since the middle ages. Since this is a handmade product, actual color shades and patterns may vary slightly than the pictured image. Take this opportunity to own a handmade piece of jewelry with a historic past.