In the movie Blood Diamond (2006), Leonardo DiCarpio wears a Breitling Chrono Avenger watch with solid titanium 44mm case on a brown calf leather strap.

The exact model watch worn by Leonardo DiCaprio is the Breitling Chronograph Avenger Titanium Automatic E13360 44mm with a brown leather strap.

The dial features a date window at 3 o'clock, Arabic numerals, and three chronograph subdials. The watch has white hour and minute hands and a white and red lollipop seconds hand.

The dial is most likely black, although in some pictures the dial looks blue. This blue reflection from the sapphire crystal is most likely the anti-reflective coating of the crystal, which produces a bluish hue when viewed at certain angles.

The exact same Breitling Chrono Avenger with Titanium case as seen in Blood Diamond can be found on eBay for around $2000 - $3500.

Shop at eBay ($2,000 - $3,000)
Pre-owned

Alternative models

Since the old Breitling Avenger from the time of the movie is hard to find, you could consider the beautiful and slightly bigger (45mm case) GMT version of the Breitling Chrono Avenger, currently for sale at these online shops:

Shop at Bob's Watches ($4,795 - Black Dial)
Cash wire price. Free Shipping

Shop at JomaShop ($2,995 - Black Dial)
On Sale - Free Shipping

Shop at JomaShop ($3,150 - Blue Dial)
On Sale - Free Shipping

Note that these have a GMT movement and a steel case (instead of the Titanium case worn in the film) but personally I prefer the look of the steel.
A non-GMT Breitling Chrono Avenger with a blue dial is available Amazon:

Shop at Amazon ($3,294 - Blue Dial)
Free Shipping - fast and easy returns

The Chrono Avenger is also available in other editions at JomaShop, see all listings here.

Blood Diamond is a 2006 American political war thriller starring Leonardo DiCaprio, Jennifer Connelly, and Djimon Hounsou.