Protect and Defend: A Thriller

Understated black on black says you mean business. Cambridge watch by adidas crafted of black nylon plastic bracelet and round case with black aluminum turning bezel. Black grid-patterned chronograph dial features numerals at three, six and nine o'clock, stick indices, three subdials, three hands and logo. Quartz movement. Water resistant to 50 meters. Two-year limited warranty.

Elegant rose-gold and sparkling diamonds add sophistication to this timepiece from Citizen's Signature Fiore collection. Powered by Eco-Drive, harnessing natural and artificial light, never needing a battery.

Brilliant diamond-accented precision, by Bulova. This Precisionist collection watch features a continuously sweeping second hand that keeps time accurate to ten seconds a year. Round stainless steel case and black fabric on beige nubuck strap. Diamond accents at bezel. White mother-of-pearl dial features silvertone hands and logo, diamond accents at markers and date window at six o'clock. Quartz movement. Water resistant to 30 meters. Three-year limited warranty.

Endorsed by researchers associated with Children's Hospital Boston and Harvard Medical School