The general auction house's blueprint price is around 100-600, depending on the properties of the cut gemstone. I know the lowest is Spark Love Star, 80 to 120G, but I'm in the second district. I suggest you go to the auction house when you are free, sometimes you will find bargains. Hehe, I once went to the auction house at two o'clock in the middle of the night and took a picture of 6540. I sold 300G the next day, but if you can cut the purple stone, you can help others reduce the manual cost. Nowadays, many people really need sapphire, and its properties are much better than sapphire.