Czechisch indigo coloured pressed glass petals with adjustable white bronze ring base.
White bronze: it is an alloy of varying amounts of copper, tin, and zinc. It is commonly used in jewelry, is an ideal substitute for nickel and silver because of its appearance and chemical properties. It is nonmagnetic, very smooth, nickel-free and virtually nonporous. It is also highly resistant to corrosion and breakdown. It also offers one advantage that silver does not, namely, that it will not tarnish.