Sterling silver charm with 2 faceted dyed corundum rondelle beads. The dyed corundum measure approximately 2.5mm x 4.5mm each. Represents July's birthstone. .925 sterling silver. ABOUT CORUNDUM STONES: Corundum is the exact same mineral, but lower-quality equivalent, to ruby and sapphire. These stones go through a chemical process to even and enhance their color and develop their natural characteristics, which can include heating and dye. This results in a mineral equivalent that is a beautiful and affordable option for wearing large carat weight stones in the corundum families of rubies and sapphires.