10K Gold Franco Necklace / 5 MM10k gold ( . 417 purity real gold ) Franco link chain. The chain can customized to be hollow or solid depending on budget. Choose your chain type and length and the price will adjust above. The gram weight of the chain will adjust once you select chain type and lengthChain Type Hollow Chain : Solid gold on the outside and hollow on the inside Solid Chain : Solid gold on the outside and solid gold on the inside All Chains are durable and come with