So it was that the Tasmanian left-hander was left celebrating the highest score of his career - 232 - on a record-breaking day for both himself and his team at Derby's County Ground on Saturday.
Having got to 152 not out on Friday, Jewell ploughed on confidently, going past his career-best 227 which he compiled in the Sheffield Shield against Western Australia at Hobart last year.
He was eventually bowled, trying to smack a big one off Jack Leaning over mid-wicket, having amassed the highest score ever by a Derbyshire batter against Kent in 151 years of the fixture.
He'd batted in total for 361 balls over nearly eight-and-a-half hours at the crease, having curbed some of his attacking flair in a more disciplined approach - a "grind", as he liked to call it - and was left relieved as well as delighted.
"Yeah, it's been a long time coming," said Jewell, who had started his spell at the county with five straight fifties but had never been able to kick on until this huge effort took Derby to a record total against Kent, 5-587dec.
"Probably felt like it was something on my mind for a while, so it was nice to make the most of it once I got there," he said.
"The 100 is something I've spoken to (coach) Mickey (Arthur) quite a bit about, it was sort of annoying me that I couldn't quite get there."
The double-hundred though has taken his championship tally to 693 runs, the third-highest by any batter this season, with Lancashire's Marcus Harris still out on his own on 805.
At Northampton, Gloucestershire captain Cameron Bancroft looked on his way to a second hundred of the summer before he was disappointed to get out in soft fashion for 60, caught behind down the legside trying to flick Northamptonshire's fellow Australian Harry Conway away.
Replying to Northamptonshire's 469, led by Saif Zaib's 159, Bancroft's dismissal left Cameron Green (3no) having to lead another rescue act with Gloucester on 4-156.
Green's fellow Australian allrounder Beau Webster looked encouragingly sharp with the World Test final looming as he took 2-19 off his 7.1 overs for Warwickshire against Worcestershire in a low-scoring affair at New Road.
