Fath al-Qadir discusses a restricted case of tiny pearls or comparable particles traded by weight for which a different conclusion can arise. That detail belongs to the commentary; it is not an exception silently written into Quduri's brief general sentence.
It would be unsound to infer that every modern cut diamond automatically meets this test. A particular commodity must first be assessed for whether the commercially significant qualitative and quantitative differences can actually be controlled by specification.
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A limited discussion of small weighed particles
Bab al-Salam: Fabric, Gems, Bricks and Precise Specification
Fath al-Qadir discusses a restricted case of tiny pearls or comparable particles traded by weight for which a different conclusion can arise. That detail belongs to the commentary; it is not an exception silently written into Quduri's brief general sentence.
It would be unsound to infer that every modern cut diamond automatically meets this test. A particular commodity must first be assessed for whether the commercially significant qualitative and quantitative differences can actually be controlled by specification.