Liverpool pair Martin Stamper and Bianca Walkden won gold medals at the Spanish Open in Alicante on Saturday.
just missed out on a medal at last summer's London Olympics,
overcame Russia's Vladimir Kim in the -68kg final.
In the +73kg final, Walkden beat France's Gwladys Epangue on the referee's verdict after the pair were level at 6-6 after sudden death.
There were bronze medals for fellow Britons
London-born Muhammad, who had not fought since he
won bronze at London 2012
because of injury, was defeated by Iran's Mahdi Khodabakhshi in his -87kg semi-final.
Welsh fighter Jones, who
won the German Open in March,
was beaten 13-7 by Spain's Eva Gomez in her -57kg semi-final.
The Spanish Open is likely to be the Great Britain team's final competitive fixture before the
in Puebla, Mexico from 15-21 July.