Showa Retro natural stone cufflinks. I'm not sure what kind of natural stone they are, but I've been told they are mosaic opal (there is no certificate). The stones are very beautiful, with colors like blue, purple, light blue, and milky white. The silver design on the edges is also retro and lovely. I think it's a design that would look great even if it were remade into other accessories. They have been used. Also, they are old items. There are some distortions and dullness. Please refer to the photos for the condition and size. We hope that those who understand that these are used items will purchase them. Thank you. Color: Navy