The beautiful sapphire coloured cubic zirconia crystals displayed in these studs are set into a rub over style setting, which means the stone is wrapped in silver instead of being held into place by a traditional claw hold. The crystals measure 4mm whilst the studs as a whole are 5mm high x 5mm wide x 4mm deep. They weigh 1g, have 11mm pins and are stamped with 925 for sterling silver. Perfect for a September birthday gift or for a lover of sapphire!