I've had over 30 pieces over the years, I've kept about 9-10. But I think I may have some high standards regarding which ones stay compared to others so take that with a grain of salt. Realistically, I've only found 4 that I just thought were pain ugly or never colored up well for me. FWIW, mariculture milles are the worst for survival rate. I rarely have deaths from maris and if they do die, most of the time, they are milles.What's the dud:stud ratio on maricultures? I've considered buying one a couple times, but I hear they tend to lose their color.