Size: about 13x18mm / 18x25mm / 22x30mm / 30x40mm
Shape: Convex flat bottom
Net weight: about 3g (13x18mm)
                         About 6g (18x25mm)
                         About 9g (22x30mm)
                         About 21g (30x40mm)
Natural stone: blue stone
Color: natural, random, each pattern is different