The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1943, New Series, Vol. 38, No. 4.
The story title is taken from the cover blurb.
first line: "When human blood is figured in the cost, diamonds rank highest among Africa's treasures."
Although this art is traditionally credited to Astarita, his presence beyond the splash page is vague and debatable, at best. The art in the second half of the story is crude and distorted and is by an unknown hand or hands.