Hello magic glitter the concords I have are dark blue almost purple in color.Im sure there are many differnt types of concords out there.I havent had the stems get through the juicing screen/juicing basket.I went to happyjuicer.com and looked at the breville juicer.The juicer has good reviews from users,but there was one that had the juicer blow up on them.If you want pulp free juice run the juice through a micro-screen.Some juicers come with a micromesh scren just for that purpose.When you are ready to take juicing to the highest level try a mastication juicer.Better yeilds and higher quality juice on vegies and greens.May you be blessed with vibrant health!!