Jacob & Co.

Billionaire Double Tourbillon Angel-Cut

The brand's page traces the Billionaire to 2016, a one-off skeleton tourbillon set entirely with very large diamonds, followed by several variations (Monochrome dates the line's debut to 2015; the two sources differ and neither explains); the previous Double Tourbillon used emerald-cut stones.

ref. BL140.30.BD.AC.ABALALimited · 6

Specification

Case

Shape: rectangular (Billionaire)
Size: 54 × 40 mm
Height: 11 mm
Material: 18K white gold
Crystal: anti-reflective sapphire
Caseback: sapphire
Water Resistance: 30 m / 3 ATM
Gem Setting: 98 white Angel-cut diamonds (51.13 ct) and 1 white rose-cut diamond (1 ct)

Movement

Calibre: JCAM50
Type: skeleton, hand-wound
Functions: hours, minutes; two one-minute flying tourbillons
Power Reserve: 72 hours
Frequency: 21,600 vph (3 Hz)
Components: 460
Notable: two barrels, each driving a flying tourbillon; the two tourbillons' rates are combined through a differential that drives the hands; the openworked structure sits under a fully diamond-set brick-wall dial with two round openings onto the tourbillons

Details

Dial: 18K white gold, invisibly set with 88 white Angel-cut diamonds (11.07 ct) and 80 white emerald-cut diamonds (1.14 ct); blued skeletonised hands
Straps: blue alligator leather; 18K white gold deployant buckle invisibly set with 30 white Angel-cut diamonds (15.72 ct)

Price

Retail: $3,400,000, as of Mar 2026 (as reported by Monochrome at launch, 25 Mar 2026; tax/duty/delivery basis unstated)

Other references

Angel-Cut, yellow diamonds, 18K rose gold, pièce uniqueBL140.45.AA.AA.A · 1 pieces

Angel-Cut, black-treated diamonds, 18K black goldBL140.31.AA.AA.A · 3 pieces

Complications

Tourbillon

Price and availability

Production. The consulted sources differ and no explanation was found. The official pages read on 27 August 2026 state the editions execution by execution: white diamond 6 pieces, yellow diamond a pièce unique, black-treated diamond 3 pieces; the pages' specification table gives 297 diamonds and 80.06 ct and a case of 54 × 40 × 11 mm. March 2026 launch coverage (Monochrome, 25 March) reported 18 pieces, around 79 ct and 54 × 41 × 13.2 mm, and named the 80 smaller dial stones baguette-cut where the current table says emerald-cut. The current official white page is also internally inconsistent: its specification table lists 88 Angel-cut and 80 emerald-cut dial stones, while a narrative block on the same page says 80 Angel-cut dial stones of 51.13 ct and omits the emerald-cut. This record follows the specification table and resolves nothing.

Retail. $3,400,000, as of Mar 2026 (as reported by Monochrome at launch, 25 Mar 2026; tax/duty/delivery basis unstated)

The house

Jacob & Co.

Official page

On The Crown Journal

The Billionaire built around a new diamond cut