Piaget 9131 Lapis Lazuli 18k White Gold, 1970s - Hardstone dial. Ultra-thin movement. Geometric perfection.

This extraordinary Piaget, reference 9131 C4, is a sculptural expression of the brand’s elegant boldness in the 1970s — where haute joaillerie met ultra-thin horology. Crafted entirely from 18k white gold, the watch features an architectural case and seamlessly integrated bracelet, flowing effortlessly around the wrist with refined geometry.

Its star feature? A flawless natural blue lapis lazuli dial, untouched and vivid, with the signature flecks of gold pyrite characteristic of this rare stone. Framed by a minimalist white gold bezel and paired with an elegant alpha handset, the effect is deeply refined yet undeniably eye-catching.

Inside ticks the legendary Piaget Caliber 9P, introduced in 1957 as the world’s thinnest manual-wound movement at just 2mm. This technical feat allowed Piaget to pair hardstone dials like this with ultra-slim cases — a hallmark of the Maison's daring innovation.

- wrist size in our picture is 18cm circumference -

DIAL:

• original never touched blue Lapis Lazuli stone dial in flawless condition
• original hands and crown

BRACELET & CLASP:

• the original Piaget integrated 18k white gold bracelet is fitting up to 18 cm wrist size and is not adjustable / 1.8 mm thick
• for bracelet adjustments a goldsmith is needed
• 18k gold Piaget clasp with Piaget logo

CASE:

• great overall condition, showing very minor traces of use
• 3- body 18k white gold case with screw-down case back
• 23 mm (without crown) / 23 mm (lug-to-lug) / 23 mm (between lugs) / 5 mm thick
• Year: 1970s
• Ref.: 9131 C4
• total weight: 93 g

MOVEMENT:

• Piaget Cal. 9P - manual wind
  
• 18 jewels, 19800 A/h, 36 hours power reserve
• professionally serviced 10/2025
• +25 sec/d / 300°

BOX & PAPERS:

• GOLDAMMER box
• GOLDAMMER certificate of authenticity and GOLDAMMER service documentation card

GOLDAMMER REFERENCE: #1219