Delicate K18 gold-plated chain necklace with a lobster clasp closure, non-adjustable. - Material: K18 gold-plated - Design: Delicate chain - Clasp: Lobster clasp - Length: Non-adjustable K18GP is a hallmark indicating the purity of gold, meaning "18-karat gold-plated." K18GP Meaning: Gold (K) with a purity of 75% gold plating (GP) Processing method: The base material is placed in a plating solution of molten gold alloy, and gold is deposited on the surface through electrolysis. Features: Can be produced inexpensively, but the gold plating is thin and therefore easily peels off due to scratches, etc. Hallmark: K18GP. This "GP" is an abbreviation for "Gold Plated," indicating that the product has been gold-plated. Gold plating is a process of applying a thin film of gold to another base metal. K18GP products are made by thinly coating a base made of brass, etc., with a gold alloy. Those with metal allergies should be careful as the coating will reveal brass or silver underneath. This is an item I purchased previously. The purchase price is unknown. I'm selling it because I no longer use it. I've used it quite a bit. I don't know how many years ago I bought it. I hope to sell it to someone who understands and likes it. Please refrain from purchasing if you are sensitive to such things. Please look at the images and if you have any questions, please be sure to inquire before purchasing. ○ The material of the main body is K18 gold-plated. ○ Necklace size: Approximately 41 cm ◯ Weight: Approximately 1.4 grams ◯ There is a hallmark on the plate clasp. This item will be sent by regular mail. It will be delivered to your mailbox. Thank you for your understanding.