If your Diamond Doves breed, make sure you don't sell the babies are "pairs" because they will be related (i.e. brother and sister) and should not be bred together. You want to avoid inbreeding. Encourage people to find alternate mates for your babies from other breeders - it's healthier for the species.
I say this because I frequently see Diamond Doves "pairs" for sale and I wonder how often they are really just brother and sister?