2 Ladies Necklaces Large Pendant Costume Jewelry Silver & Gold Color Marked

Here are 2 unique and ornate necklaces. I don’t believe any of them to be real gold or silver but I honestly don’t know jewelry very well, these were a gift. There is one necklace that has a pendant hanging from it and has a marking stamped in the inner neckline, but I’m not sure what it means. The second necklace has twisting design while both incorporate colors silver and gold. Please feel free to ask questions. Measurements are in photos.