Jade Art Jewelry Material: ~US imported brass, lead-free and nickel-free, in line with US and EU standards. ~Why lead-free and nickel-free? https://en.pinkoi.com/store/jadeartjewelry?tab=story ~Natural stones with high quality, no dyeing. 1) Agate ~No dyeing, glue or welding is involved in the production. ~Colour of each piece of work is unique due to natural oxidation of brass. Your understanding is appreciated. Feel free to contact us before any purchase. ~All piece of work is coated with wax to slow down further oxidation. However, metallic oxidation is a natural process, therefore, we advise customer to store the jewels in bag and jewellery box in dry and cool area. ~Since every piece is unique and handmade, only a small amount is made each time. Please contact before any purchase to ensure there is enough stock. Shop owner notes: The gems and crystals are all natural. Most of them are from my collection in the past years. Since we insist in gems quality, any further process on the gems will be listed out. You are welcomed to contact us if there is any question. About Shipping: ~ Our shop processes orders from Monday to Friday. All orders placed on weekends will be shipped on Monday. ~ Oversea Customers, yours product will be shipped by Hong Kong Post Registered Air Packet.