This was a gift from an acquaintance. It's old. Apparently, they cost around 400,000 yen for the three of them back then, and the person was debating whether to make a necklace or a ring... it seems they just put it away in a closet after buying them. There are three certificates of authenticity. They are artificial diamonds. The diamond is 1ct and the ruby is 2ct. I don't have much knowledge, so I don't know how much they can be sold for. According to the market price I researched, it seems to be from tens of thousands to hundreds of thousands of yen.