strongLos Angeles/strong: Actress Jennifer Aniston is overjoyed and overwhelmed by her eight carat emerald-cut diamond engagement ring, that her boyfriend Justin Theroux gave her. The 43-year-old actress was thrilled when Theroux proposed her on Friday. It's a huge emerald-cut diamond. It's a rectangle with tapered diamond baguettes on the sides. It's beautiful, contactmusic.com quoted a source as saying. [caption id=attachment_419022 align=alignleft width=380