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  • Amazing, Cheap & Easy, Cracked Gems & Marbles. for Fantasy & Crafts.

    Sadly these are nothing like a prince rupert's drop. A prince rupert's drop gains it's strength from the outside skin of a molten drop of glass cooling (and shrinking) more rapidly than the inside causing an inward compression. When glass cracks internally it is along lines of stress, by heating and rapidly cooling glass you introduce stress which causes it to fracture. Just because the fracturing appears to have stopped, it doesn't mean the glass is safe. Those stresses are still there. Drop it just right and it will break completely.As a glassblower (and oddly enough, a marble maker) I'll let you in on a trade "secret". If glass is cracked, even slightly it will eventually fail. This is why you see a lot of glass blowers throw away something that looks perfectly fine. It may...

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    Sadly these are nothing like a prince rupert's drop. A prince rupert's drop gains it's strength from the outside skin of a molten drop of glass cooling (and shrinking) more rapidly than the inside causing an inward compression. When glass cracks internally it is along lines of stress, by heating and rapidly cooling glass you introduce stress which causes it to fracture. Just because the fracturing appears to have stopped, it doesn't mean the glass is safe. Those stresses are still there. Drop it just right and it will break completely.As a glassblower (and oddly enough, a marble maker) I'll let you in on a trade "secret". If glass is cracked, even slightly it will eventually fail. This is why you see a lot of glass blowers throw away something that looks perfectly fine. It may not fail today, or even a decade from now, but eventually that crack will grow and the piece will fail.Be careful of how and where you use these marbles.

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