Unveiled in 2025, the Vacheron Constantin Traditionnelle Perpetual Calendar Ultra-Thin 4305T/000G-H135 showcases a luxurious diamond-studded design, tailored from an 18K white gold case. The 36.5 mm watch features a stunning silver-tone opaline dial and is adorned with diamonds on the bezel, lugs, crown, and buckle. Its case has a diameter of 36.5 mm and a thickness of 8.43 mm. The bezel and tops of the lugs boast 76 brilliant-cut diamonds, totaling about 0.96 carats, while a single round-cut diamond weighing approximately 0.14 carats graces the crown. The sapphire crystal case back allows a glimpse into the intricate movement, with the watch's water resistance reaching depths of up to 30 meters.

The opaline dial retains a classic four-register format like its non-gem-set counterparts, showcasing the day at 9 o'clock, date at 3 o'clock, month alongside leap-year cycle at 12 o'clock, and moon phase with age of the moon at 6 o'clock. Hour markers are applied baton styles, along with intricately faceted Dauphine hands crafted in 18K white gold. At its heart lies the automatic calibre 1120 QP, with a thickness of 4.05 mm, providing perpetual calendar and moon-phase functionalities. Operating at a frequency of 19,800 vibrations per hour, it promises a power reserve of around 40 hours. Completing this exquisite timepiece is a dark blue Mississippiensis alligator leather strap paired with an 18K white gold pin buckle, which is elegantly set with 17 round-cut diamonds weighing about 0.09 carats. The watch proudly holds the Geneva Seal certification.