وبوزن حجر بعينه لا يعرف مقداره
Translation: Sale may likewise be made by the weight of a specifically identified stone, even if the stone’s numerical weight is unknown.
A fixed stone could function as a counterweight on a traditional balance. Its numerical mass need not be known in grams if the particular stone has been identified as the standard.
The rule concerns a known physical standard, not permission to leave the sold goods or their price undefined.
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Kitab al-Buyu: Grain Sales, Bulk Heaps, Qafiz and Unit Prices
وبوزن حجر بعينه لا يعرف مقداره
Translation: Sale may likewise be made by the weight of a specifically identified stone, even if the stone’s numerical weight is unknown.
A fixed stone could function as a counterweight on a traditional balance. Its numerical mass need not be known in grams if the particular stone has been identified as the standard.
The rule concerns a known physical standard, not permission to leave the sold goods or their price undefined.