He was born in the same year as Spock, son of Sarek, and was part of the same coming-of-age ceremony in 2247. (TOS novel: Vulcan's Forge) While Spock was away from Vulcan serving in Starfleet, Stonn began a relationship with T'Pring, who had been betrothed to Spock. (TOS novel: Vulcan's Glory)
When Spock experienced pon farr and returned to Vulcan to take T'Pring as his wife. T'Pring, however, invoked the kal-if-fee and forced Spock to fight James T. Kirk for her hand in marriage, so that she would be able to stay with Stonn. Spock ultimately decided to allow Stonn to take T'Pring as his wife, warning him that having her would not be the same as wanting her. (TOS episode: "Amok Time")
By 2288, Stonn and T'Pring were married as well as had at least one child, T'Ariis though by the time she grew up she had little respect for her father. He also had a second wife who was Sepora and at this time he suffered from an illness but he did not inform his family; allowing his daughter to blame Sepora and Sepora to blame T'Ariis. Stonn later died from the disease he was suffering from in that year. (TOS comics: "Bait...and Switch", "Rivals (comic)")
- This contradicts events within the novels which shows that he survived into the late 24th century.
In an alternate timeline in which John Frederick Paxton destroyed Starfleet Command and ended the talks for the Coalition of Planets in 2155, Stonn was the consort of Subcommander T'Pring, the aide to Councillor Sarek.
He served as a science officer aboard the ICV Kuvak, with the rank of Sublieutenant, during the early 2260s. Captain Syvak regarded him as "competent but mediocre." Stonn was killed when the Kuvak was destroyed by a Romulan bird-of-prey over Babel in 2264. (TOS - Myriad Universes novel: A Less Perfect Union)