He represented Serbia and Montenegro at the 2000 Summer Olympics in Sydney, Australia, where he lost in the first round of the Men's Welterweight (– 67 kg) competition to Thailand's veteran Parkpoom Jangphonak due to a controversial 9-9 point decision.

[citation needed] Ajetović won a bronze medal at the 2001 Mediterranean Games in Tunis, Tunisia.

Geard Ajetović grew up in the former Republic of Yugoslavia and started boxing at the age of 8.

Due to a knee injury Ajetović was forced to a take a 2-year break from fighting, but had a successful comeback at the end of 2010.

In January 2011 Ajetović won the vacant WBC Mediterranean title by a first-round knockout victory over Jackson Chanet, having moving up to light heavyweight for that fight.