Launched in 2025, the Hamilton Jazzmaster Open Heart is a striking watch with a case diameter of 42 mm crafted from stainless steel. Its open-heart dial features an alluring blue aventurine-inspired surface, offering a glimpse of the intricate movement within. The case has a thickness of 14.95 mm and measures 50 mm from lug to lug, while the lug width is 22 mm. A sapphire crystal with anti-reflective coating protects the dial, and the watch boasts a transparent case back along with water resistance up to 50 meters.

The eye-catching blue aventurine dial showcases sections that are openworked, allowing wearers to observe elements of the automatic movement below. Time is displayed via central hands for hours, minutes, and seconds. This model highlights a design that seamlessly merges the classic Jazzmaster Open Heart style with a dark blue, speckled pattern reminiscent of aventurine glass. Powering this timepiece is the Hamilton H-10 movement, renowned for its impressive 80-hour power reserve and equipped with a Nivachron balance spring. Completing the look is a sophisticated blue leather strap.