14K white gold. This is from when I was collecting Hawaiian jewelry. It's a cute white gold plumeria. A zirconia is set in the center (I don't think it's a diamond). I bought it, but I had bought various charms at the time, so I haven't used it much, but there are a few small scratches. Please refrain from purchasing if you are sensitive to used items. There is no warranty. Returns and exchanges are not accepted, so please ask if you have any questions.