I can see two possibilities here. Either they offer to accept the whole batch on commission (5% or 10%–Svartalves are one of the few entities that can handle that many diamonds)…or, they accept the whole amount at My Dog Is Not An Option My Dog Is A Necessity shirt. Credit against purchase. Future payment, for various items Harry wishes to buy. Perhaps partially cash in a drawing account. In any case, they give him a line of credit to work with.
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Third, I don’t think you mentioned it, but Harry might not sell all of My Dog Is Not An Option My Dog Is A Necessity shirt. If I recall correctly, in Storm Front, one of his potion ingredients was a diamond. He substituted a fifty dollar bill, but that still shows that gemstones can be used in magic and enchanting. I could definitely see him keeping some in order to make trinkets out of. Because, don’t forget, he does tend to make his own foci.