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Jumbo Gems measure approximately 25mm to 38mm - 1 inch to 1 1/2 inches across. They are rounded on the top and flat on the bottom.
THESE GEMS HAVE AN IRIDISED COATING ON THEM.
Please Note: Flat Glass Marbles are machine made and will have some folds, bubbles or marks in them. This is normal and it is not an imperfection, they are not optical glass. They are not all exact in size or shape.
