Taolei 18k gold-plated chain and blue stone pendant

Pendant necklace has 18k gold plated chain and dangling round pendant with blue faceted stone. I am not sure what stone composition is, but it is a pretty marbelized faceted stone. The chain is approximately 8 inches closed (16 inch) with 3 inch extender. The 2 sided stone stone has some minor surfaces wear/scratch upon very close examination..see photo. Still lovely and wearable. Pre-owned from smoke free home