a=15,60 mm; b=14,00 mm; c=2,60 mm, sterling silver (AG-925)
a=16,50 mm; b=14,00 mm; c=2,60 mm, sterling silver (AG-925)
a=3,00 mm, b=10,00 mm; c=3,10 mm; d=1,55 mm, sterling silver (AG-925)