Richard Mille's Tourbillon RM 56-02 Sapphire watch retails for over $2 million

With a transparent case made from solid sapphire, this Richard Mille watch has titanium movements and is both scratch-resistant and water resistant up to 3 meters.
Only 10 of the Tourbillon RM 56-02 Sapphire were made and they cost $2.02 million. Each watch “requires 40 days of continuous 24/7 machining for the case followed by 400 additional hours” of finishing work, according to Watch Time.