The Jewel of Thesia
The Jewel of Thesia was an item of national heritage on the planet Straleb.
Its rightful heir was Benzan who, in 2365, had Thadiun Okona smuggle the jewel to Atlec aboard the Erstwhile to be given as a wedding proposal to Yanar, the mother of his son. (TNG: "The Outrageous Okona")