Recycled sterling silver and handblown borosilicate glass. * Remember that each crystal is handmade, so it is unique and unrepeatable. Your jewel will be similar but not the same as the one in the photo. - Dimensions: 7x 4x 2 cm = 2.76x 1.57x 0.79 in. - Weight: 9 gr. = 0.3175 oz. per unit - System:Butterfly closure. Post-fastening for pierced ears.