Instead The Girl Interrupted star wore a more modest gold band on her wedding finger.
While there is no news that the couple have in fact already tied the knot, it appears that Angelina had merely exchanged the jewellery for her official UN work duties.
Ring swap: Angelina swapped her $250,000 engagement ring from fiance Brad Pitt for a simple gold band
In fact the brunette beauty had completely pared back her look for her arrival, wearing a very plain black suit and billowing black T-shirt.
She accessorised the conservative look with some leather loafers and several other pieces of simple gold jewellery.
The mostly make-up free star also wore her hair tied back into a basic ponytail.
According to USA Today, Angelina is in the African country acting as a representative for the UN's refugee agency.
Hague and the star are planning to meet with survivors of rape and sexual violence, which is frequent in the country.
They will also speak to locals and UN groups who aid survivors.
Discussions on solutions to the conflict with political leaders are also set to take place.
Ahead of the G8 Summit in London in just three weeks time, according to Hague's office, the pair will ask Great Britain, USA, France, Canada, Japan, Germany, Russia and Italy 'to agree landmark measures to secure justice for survivors of sexual violence and deter perpetrators.
'These include a new International Protocol on the Documentation and Investigation of Rape and Sexual Violence, agreement that rape and sexual violence constitute grave breaches of the Geneva Convention so that universal jurisdiction can apply, and practical commitments to help affected countries.'
While Angelina travels on official UN duties, her $250,000 engagement ring, which took her fiance Brad a year to design, is most likely locked up in a safe.