Arden International driver Razia stormed to victory a full five seconds clear of second-placed Nathanael Berthon (Racing Engineering), with DAMS's Davide Valsecchi taking third place to retain his lead in the series on 129 points. Razia is second on 104.
The victory was set up when the lights went out as pole sitter Razia made a smooth getaway while fellow front row starter Max Chilton got bogged down and held up the pursuers.
That gave the Brazilian an easy line through turn one, while behind him a fast starting Valsecchi couldn't quite get past Berthon and had to pull in behind to get through turn two ahead of Chilton, Giedo van der Garde and James Calado.
Razia sailed on serenely, easily controlling the pace and pulling away from his rivals to claim a simple victory, while Berthon drove a mature race to claim his first GP2 podium.
Valsecchi followed him across the line to round out the podium after hanging on against huge pressure for much of the race from Calado.
Chilton had enough to hang on ahead of van der Garde and Gutierrez, who had their own private battle in the closing laps, while Coletti wrung everything out of his aging tyres to hold on for the final point.
1. Luiz Razia Arden International
2. Nathanaël Berthon Racing Engineering
3. Davide Valsecchi DAMS
4. James Calado Lotus GP
5. Max Chilton Carlin
6. Giedo van der Garde Caterham Racing
7. Esteban Gutierrez Lotus GP
8. Stefano Coletti Scuderia Coloni
9. Felipe Nasr DAMS
10. Fabrizio Crestani Venezuela GP Lazarus
11. Fabio Leimer Racing Engineering
12. Tom Dillmann Rapax
13. Johnny Cecotto Barwa Addax Team
14. Rodolfo Gonzalez Caterham Racing
15. Rio Haryanto Carlin
16. Josef Kral Barwa Addax Team
17. Fabio Onidi Scuderia Coloni
18. Stéphane Richelmi Trident Racing
19. Simon Trummer Arden International
20. Victor Guerin Ocean Racing Technology
21. Marcus Ericsson iSport International
22. Ricardo Teixeira Rapax
23. Nigel Melker Ocean Racing Technology