i got a pair of marc aurel lead crystal candle holders as a present, how much would you say they are worth?

they are about 7 inches long and about 2 inches thick. they are in the form of a square that has the corners twisted, from the top they resemble a pinwheel a bit. they are thicker on the bottom and heavy as heck! im just looking for a guestimation, not to sell. i dont know anything about crystal and was curious. thanks in advance.

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