Skip to content
Face up photo of Luna Magna White Gold "Ultimate I"

Luna Magna White Gold “Ultimate I”

A watch face featuring ruthenium crystals and a dial made of white opal. A bezel set with baguette-cut diamonds. A three-dimensional moon paved with blue sapphires and diamonds.

Limited to 8 pieces.

Celestial brilliance

Arnold & Son set out to create a series of high-end jewellery interpretations of its three-dimensional moon model. In addition to the technical feat of placing a mechanical star measuring 12mm inside a watch, this piece displays superlative jewel-setting ability, both in the stones and techniques used. With paved and invisibly-set precious stones, Arnold & Son have applied their exceptional know-how to creating eight Luna Magna Ultimate I watches. Poetic and rare, they reveal an outstanding level of detail.

Technical Specifications

Reference: 1LMMW.Z01A.C174A
hours, minutes, astronomical moon-phase, moon-phase indicator on the back
37.60 mm
12.00 mm with three-dimensional moon (4.75 mm without moon)
Power reserve:
90 hours
3 Hz / 21,600 vph
blue-treated ruthenium crystals
white opal
Moon phases
12.00 mm in diameter, 18K white gold set with 161 diamonds and 161 sapphires
18K white gold, bezel with dual-row invisible setting and studded lugs, with a total of 112 baguette-cut diamonds (~5.90 ct)
44 mm
15.90 mm
domed sapphire, with an anti-reflective coating on both sides
sapphire crystal, with an anti-reflecting coating
Water resistance:
3 bar (30 metres/100 feet)
blue or black alligator leather, hand-stitched
pin buckle, 18K white gold, set with 26 baguette-cut diamonds (~0.97 ct)

Interested in this watch?

Photo of Luna Magna White Gold "Ultimate I"


The sophistication of this celestial mechanism also lies in its astronomical accuracy. The length of a full moon cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds. Arnold & Son has produced a likeness such that it would take 122 years for the movement to accrue a one-day interval between the watch display and the true celestial cycle. Nevertheless, this error is easy to correct given that the lunar function on the Luna Magna Ultimate I is directly accessible from the crown. Arnold & Son’s complete mastery of the watchmaking process allows for this practical touch.

Soldier photo of Luna Magna White Gold "Ultimate I"

High altitude

Only the most precious materials are used in the Luna Magna Ultimate I limited series. The case, measuring 44mm in diameter, is made of white gold and set with 7.62 carats of the highest quality diamonds. These include 20 baguette-cut diamonds on the case’s lugs, cut one by one to fit the unique shape of each mount.

A fine ring resembling the ring around Saturn constitutes the bezel, orbiting the Luna Magna Ultimate I case. It contains 112 baguette-cut diamonds totalling 5.90 carats. Light can enter freely, just as it would an open prism, thanks to the dual-row invisible setting which allows for radiance beyond compare.

Soldier photo of Luna Magna White Gold "Ultimate I"

Iridescent display

Within the circle of blue radiance lies a dial in the conventional sense, featuring twelve Roman numeral markings, the Arnold & Son signature and the hands. This off-centre subdial owes its delicate colour to white opal, and its finesse befits a piece of the finest jewellery such as the Luna Magna Ultimate I.

Double hemisphere

Beneath the timepiece, the three-dimensional moon is the standout feature of the Luna Magna watches. Gem-setting of the utmost intricacy coats the entire white gold sphere. It is divided into 161 brilliant-cut diamonds for daytime and as many blue sapphires for night-time. The line between the two colours is a ripple of blue and white along the outline of the stones.