You are buying Not just Top Quality Sew on Faceted Setting Gemstone.***They are Free of Nickel and Rhodium Plated Unlike other sellers items..I SPECIALLY ORDERED THE MANUFACTURERS MAKING THIS WITH NO NICKEL.Montees have been used to embellish fabric, but they are the perfect accent for bead weaving and embroideryas well, and they can even be used with beading wire projects and wire projects.These items are from one of the Top Manufacturers.. The company has long History of manufacturing stones and have been exporting all around the world...You can attach this cabochon on any clothing and accessories like brooch, headband, shoes, bags. Usage of this item is almost endless...(Or use glue)Because this is not Nickel Plated..Color won't change over time period.(Nickel plating tarnishes a darker color over time and if it is steel base, you cannot protect steel from rusting.)Top Quality Material..Base metal is Brass( This is not Steel Base, Tin, nor Pewter.)Nickel FreeRhodium Plated Over Brass (Original Rhodium Plating..Tarnish Resistant)..Thank you for shopping.