The RM 07-01 has been, since its introduction, the reference through which Richard Mille has developed its relationship with women's fine watchmaking — not by producing a smaller version of an existing men's reference, which is the industry's most common approach to the category, but by building a specific case architecture, commissioning a specific caliber, and developing a specific material and stone-setting vocabulary that addresses the feminine watch category on its own terms. The TZP black ceramic and rose gold diamond-set configuration represents this vocabulary at its most materially intensive within the non-bracelet RM 07-01 production range: the black ceramic's technical character, the rose gold's warm precious character, and the diamond-set prongs' gemological character appearing simultaneously in the same 45.66 by 31.40-millimeter case, their combination producing a watch that does not resolve to any single material register but occupies the specific intersection of all three. On a black rubber strap, the fourth material of this combination — flexible, lightweight, tactilely immediate against the skin — extends the watch's material range to four distinct categories of material in a single object: technical ceramic, precious metal, gemstone, and elastomer.
The TZP black ceramic — tetragonal zirconia polycrystal, the specific zirconia-based ceramic that Richard Mille designates TZP to distinguish it from the ATZ white ceramic of the lighter RM 07-01 variants — is composed of over 95 percent zirconium dioxide (ZrO₂) in its tetragonal crystal phase, the specific crystal structure that produces the material's exceptional combination of hardness and toughness. At 1,400 Vickers hardness, TZP black ceramic is substantially harder than steel (typically 300–400 Vickers for watch-grade stainless steel) and significantly harder than titanium, while its toughness — its resistance to brittle fracture under impact loading — exceeds that of sapphire at equivalent hardness levels, the tetragonal crystal phase providing crack-tip stress transformation that deflects propagating fractures and absorbs impact energy. The material is biocompatible, corrosion-resistant to all atmospheric and aqueous agents under normal wearing conditions, and immune to the scratch marking from keys, metal surfaces, and jewelry that would mark a gold or steel case. Its black color is intrinsic to the material's composition rather than applied as a surface treatment — the chromophore is incorporated into the zirconia matrix during sintering — ensuring that the black surface does not wear, chip, or degrade in appearance across the watch's operational life. The bezel and caseback in TZP black ceramic carry the 20 grade-5 titanium spline screws that secure the case's tripartite structure, the harder titanium screws providing the correct assembly torque control against the ceramic's own hardness.
The rose gold prong setting of the diamonds on the ceramic bezel and dial center field is the configuration's most technically demanding production element. Setting diamonds in ceramic presents a challenge that setting in metal does not: metal is malleable and can be formed around the stone after placement, the prong bent over the girdle and burnished to secure the stone by plastic deformation. Ceramic is not malleable and cannot be deformed around a stone without fracturing. The RM 07-01's solution, documented in Richard Mille's own technical specifications, is to manufacture the 5N red gold prongs individually — each prong hand-polished as a separate component before installation — and then embed each prong in the ceramic at its setting position, the prong inserted into a precision-machined recess in the ceramic surface and secured by the geometry of the fit rather than by metal deformation. The diamonds are then set against these pre-embedded prongs in the conventional prong-setting manner, the gold prongs' malleability finally invoked at the diamond placement stage. This process — in which the ceramic and gold prong are prepared separately, brought together in the ceramic, and only then used to hold the stone — is substantially more time-consuming per stone than conventional metal setting and produces a visual result that conventional metal setting cannot approximate: the prongs appearing to emerge from the black ceramic surface as discrete gold elements, their individual manufacture evident in the precision and polish of each prong's surface.
The movement is Calibre CRMA2, Richard Mille's in-house automatic caliber developed for the RM 07-01 and its related feminine references. At 29.90 by 22.00 millimeters and 4.92 millimeters in thickness, the CRMA2 is dimensionally appropriate to the 31.40-millimeter case width without the movement-to-case proportion reduction that fitting a larger caliber would impose. The baseplate and bridges are machined from grade-5 titanium — the same 90-6-4 alloy used across Richard Mille's movement construction — then micro-blasted and subjected to the grey electroplasma treatment that bonds a hard surface layer chemically to the titanium rather than depositing it physically as PVD does. The going train's wheel teeth are produced with a 20-degree pressure angle, developed specifically for Richard Mille's in-house calibers to equalize inter-center discrepancies that arise between wheel centers during thermal expansion and normal use, promoting consistent torque transmission to the balance wheel across the movement's full operating temperature range.
The balance wheel is a copper-beryllium (CuBe) four-arm design with four setting screws, its moment of inertia of 7.5 mg·cm² and angle of lift of 50° matched to the AK3 balance spring — the specific spring material designation used by Richard Mille for this caliber's isochronism requirements. The transparent INCABLOC 908.22 shock protection, positioned to protect the balance pivot from impact loads, uses the transparent variant that allows the protection mechanism to be observed through the skeletonized architecture without the visual interruption of an opaque shock device. The Rubifix escapement wheel jewels, also in transparent material, allow the escapement geometry to be read directly through the movement from the dial side. Operating frequency is 28,800 vibrations per hour — 4 hertz — with 25 jewels and approximately 50 hours of power reserve, plus or minus ten percent, from the variable-geometry automatic winding rotor.
The variable-geometry rotor's adjustment mechanism for the CRMA2 operates through two weights mounted on the rotor's arms, each weight adjustable by a watchmaker to a different radial position along the arm. When the two weights are positioned close together (near the rotor's center), the rotor's moment of inertia is increased and the barrel winds more quickly per unit of rotor rotation — appropriate for a less active wearer. When the weights are positioned toward the extremities of the arms, the inertia decreases and the barrel winds more slowly per unit of rotation — appropriate for a more active wearer. The adjustment is a watchmaker's intervention rather than a real-time automatic adaptation, the rotor set to a fixed geometry calibrated to the anticipated activity level. The rotor's external edge and edge ring are in 5N red gold, the heavy metal weight segments providing the mass differential between the two rotor positions. The OneWay® ceramic ball bearing winding system, with bidirectional capability, supports the rotor's rotation with the specific bearing smoothness and corrosion resistance that ceramic balls provide.
The RM 07-01 in TZP black ceramic and rose gold on black rubber strap presents four material categories simultaneously — ceramic, gold, diamond, elastomer — whose relationship is one of deliberate contrast rather than material harmony. The ceramic and the rubber are technical materials whose origins in industrial chemistry are legible in their surfaces; the gold and the diamonds are precious materials whose origins in geological rarity are legible in theirs. The watch's design decision is to hold all four in the same object without smoothing their differences into a single material register — the TZP black remaining technically hard against the rose gold's precious softness, the black rubber remaining utilitarian against the diamonds' extravagant specificity. The result is a watch that is neither a pure jewelry object nor a pure technical instrument but the specific product of a maker whose identity is precisely this combination — and whose most considered feminine reference wears that identity with the greatest material density of any configuration in the RM 07-01 family's production.
