Hold the marbles up to the light and look for subtle flaws or marks that indicate the age. Older marbles will have certain bubbles or flaws caused by the glass-blowing process. Compare the colors of one type of marble to another.

How can you tell a marble?

Rather than simple colors, marble comes in slight shades that can range from white to black. When marble has no visual flaws or impurities it is a solid white hue. Integration with minerals, such as the layers in limestone, causes colorations, like yellow, green, gray, cream, blue, and pink.

How can I tell if my marbles are old?

Hold the marbles up to the light and look for subtle flaws or marks that indicate the age. Older marbles will have certain bubbles or flaws caused by the glass-blowing process. Compare the colors of one type of marble to another.

Is green marble rare?

It is typically greenish in colour. It is one of the rarest forms of marble in the world. Deposits date back some 600 million years!