Older marbles come from an estate. I am not an expert in marbles, so please review the pictures closely. The marbles have discolorations, scratches, scuffs, and chips. The cobalt swirl marble measures approx 16.2 mm. The cloudy blue marble with multiple chips is approx 15.62 mm. The red and blue marble is approx 15.85 mm. The last three multicolor marbles are approx 15.21, 15.45, and 15.8.
