Glass stones - Glass and crystal rhinestones are always measured in SS which stands for stone size. Ex: When you see SS16 stone, this is is a glass or crystal stone. Quantities:Glass - These stones are usually offered in quantities called gross - 1 gross = 144 stones and most bags of crystal and glass come in a 10 gross bag which equals 1,440 stones. Resin - These are most often measured in mm sizes. Ex: Jet black, 2mm would be a resin rhinestone. These come in counted quantities of 5,000 - 10,000 stones.Jelly - These similar to resin are also measured in mm sizes. These come in counted quantities of 5,000 - 10,000 stones as well.See our helpful calcs sections where you can get estimates on your gem counts for your size projects: Tools & Calcs