| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:14.53 | ESWIM New Year's Cup 2026 | 2026-01-09 |
| 100m Breaststroke | 1:16.60 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Breaststroke | 1:15.90 | 2025 Age Group International SC | 2025-11-27 |
| 100m Butterfly | 1:18.85 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 100m Freestyle | 1:06.30 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 100m Freestyle | 1:03.32 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Backstroke | 2:41.27 | ESWIM New Year's Cup 2026 | 2026-01-09 |
| 200m Breaststroke | 2:42.68 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m Breaststroke | 2:45.35 | 2025 Age Group International SC | 2025-11-27 |
| 200m Breaststroke | 2:32.22 | ESWIM SCY Time Trial | 2026-02-26 |
| 200m Butterfly | 2:49.72 | ESWIM January Time Trial | 2026-01-20 |
| 200m Freestyle | 2:23.48 | ESWIM New Year's Cup 2026 | 2026-01-09 |
| 200m Freestyle | 2:16.40 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m IM | 2:31.59 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m IM | 2:29.47 | 2025 Age Group International SC | 2025-11-27 |
| 400m Freestyle | 5:03.87 | 2025 Age Group International LC | 2025-06-05 |
| 400m Freestyle | 4:48.19 | 2025 Age Group International SC | 2025-11-27 |
| 400m IM | 5:21.99 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 400m IM | 5:16.80 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 400m IM | 4:52.18 | ESWIM SCY Time Trial | 2026-02-26 |
| 50m Backstroke | 34.67 | ESWIM New Year's Cup 2026 | 2026-01-09 |
| 50m Breaststroke | 34.80 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Breaststroke | 34.62 | 2025 Age Group International SC | 2025-11-27 |
| 50m Butterfly | 33.63 | Hall of Fame | 2025-10-18 |
| 50m Freestyle | 30.08 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 50m Freestyle | 28.22 | 2025 Age Group International SC | 2025-11-27 |
| 800m Freestyle | 9:59.23 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 800m Freestyle | 9:51.28 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
Diomis, George's top personal bests include 100m Backstroke (1:14.53), 100m Breaststroke (1:16.60), 100m Breaststroke (1:15.90), 100m Butterfly (1:18.85), 100m Freestyle (1:06.30).
Diomis, George swims for Etobicoke Swim Club.
Diomis, George has competed in 11 meets.