The compelling new documentary “Blood from a Stone” (8 p.m., History) follows one man’s obsession with buried diamonds, which consumes more than a decade of his life and leads him on an investigative treasure-hunt through centuries of history.

Yaron Svoray, a professional Nazi-hunter, anti-terrorism expert and larger-than-life character, first heard about the missing gems in 1988 when a former American GI told him that he and his buddies had buried 40 large, uncut diamonds near their foxhole in France during the closing weeks of World War II.

Intrigued, Svoray traveled to the battlefield in 1989, but discovered that merely digging holes was a futile venture. He aptly describes it as trying to find a needle “in a stack of needles.” Undaunted, Svoray traces the missing diamonds’ path from the mines of South Africa to Amsterdam’s diamond-trading district to the Nazi concentration camps of the second world war. “When I started this,” Svoray recalls, “it was about finding a bunch of diamonds, becoming Indiana Jones and living in Aruba.” But after discovering the bloody history of the gems, he decided he could never personally profit from their discovery.

• Funny, but I never put the words “Leeza Gibbons” and “IQ test” in the same sentence before. The entertainment reporter and TV producer is host to “Test the Nation” (7 p.m., Fox), a two-hour interactive intelligence examination. Viewers will be given the opportunity to gauge their own IQs by taking the test from home while watching a live studio audience take the quiz on the air.
• Australia’s loudest reptile-wrangling extrovert, Steve Irwin, will play host to a week’s worth of “Crocodile Hunter” (8 p.m., Animal Planet) episodes live and uncut.
• The Biography Channel airs the half-hour profile “Star Close Up: Martin Short” (8 p.m., Biography), filmed on the set of Short’s Comedy Central series “Primetime Glick.”

Tonight’s other highlights

• The Mighty Ducks and the Devils will meet in Game 7 of the Stanley Cup NHL finals (7 p.m., ABC).
• Scheduled on “Dateline” (9 p.m., NBC): an interview with Laci Peterson’s family.