ArtyA’s latest sapphire watch takes one of the brand’s most recognisable mechanical signatures and frames it in a curvier, more wearable case.
The Purity Curvy HMS Sapphire Sport Edition keeps the drama focused on transparency, colour and the suspended balance architecture of the Stairway to Heaven movement.
It also gives the otherwise clear sapphire case a playful twist, with colour coming from interchangeable gaskets rather than tinted crystal.
At a glance
- ArtyA has introduced the Purity Curvy HMS Sapphire Sport Edition in a tonneau-shaped sapphire case.
- The watch features the brand’s openworked Stairway to Heaven HMS movement with a suspended 4Hz balance and 72-hour power reserve.
- It is limited to 99 pieces and priced at CHF 49,900, EUR 55,000 or USD 61,000 excluding tax.
A curvier sapphire case with colour beneath the surface
The Purity Curvy HMS Sapphire Sport Edition follows the configurable Purity Tourbillon Sport Editions, but swaps high complication for a cleaner three-hand display.
Its case is the central statement.
The tonneau-shaped Curvy case measures 38.5mm wide and 43mm long, with the crown positioned at 12 o’clock.
ArtyA uses Saphir Absolu, its trademarked name for ultra-pure optical-grade synthetic sapphire crystal.
The material is rated 9 on the Mohs hardness scale, making it extremely resistant to scratches, though its hardness also means the case has to be shaped using diamond-machining processes.
What looks at first like coloured sapphire is actually a clearer visual trick.
The case remains transparent, while the colour is produced by the gasket on the caseback.
ArtyA offers the gasket in orange, black, blue, purple, white, yellow and turquoise, paired with a matching leather strap.
Both the gasket and strap can be changed by an ArtyA retailer, giving the watch a level of flexibility that fits the Sport Edition name without changing the case itself.
A triple anti-reflective coating is used to reduce glare across the sapphire construction.
The Stairway to Heaven movement returns in HMS form
Inside the case is ArtyA’s Stairway to Heaven calibre, developed with movement specialist Télôs.
The movement was introduced in 2024 and has since appeared in round steel and ceramic cases, a round Wavy sapphire crystal case, and later titanium and NanoSapphire tonneau-shaped cases.
Here, the architecture is presented in its HMS format, meaning hours, minutes and seconds.
The calibre is shaped like a vertical figure eight, with two parallel barrels at noon delivering a 72-hour power reserve.
Above the barrels sits the hour and minute ring, intersected by a smaller running seconds display.
The lower portion of the movement carries the stepped bridge structure that gives the calibre its name, with the balance wheel suspended in open space.
That balance runs at 4Hz.
The visual depth matters because the watch has nowhere to hide its mechanics.
The minute and balance bridges are microbead-blasted and finished with hand-polished edges, details that help define the movement’s open, architectural layout.
Purity, Curvy and Sport Edition decoded
ArtyA’s naming can sound dense at first, but this model is unusually literal once broken down.
Purity refers to the brand’s minimalist openworked collection.
Curvy identifies the tonneau-shaped case.
HMS covers the time-only display with hours, minutes and seconds.
Sport Edition points to the ergonomic sapphire case construction and the customisable colour elements.
The result sits in an interesting space for ArtyA.
It isn’t as mechanically complex as the Purity Tourbillon Sport Editions, yet the transparent case and suspended escapement give it much of the same visual impact.
For collectors drawn to sapphire cases but less interested in tourbillon pricing or complexity, this is the more direct expression.
Details & Specifications
| Brand | ArtyA |
|---|---|
| Model | Purity Curvy HMS Sapphire Sport Edition |
| Case size | 38.5mm wide x 43mm long |
| Case shape | Tonneau-shaped Curvy case |
| Case material | Saphir Absolu optical-grade synthetic sapphire crystal |
| Case coating | Triple anti-reflective coating |
| Crown | Positioned at 12 o’clock |
| Movement | Stairway to Heaven HMS calibre developed with Télôs |
| Functions | Hours, minutes and running seconds |
| Frequency | 4Hz |
| Power reserve | 72 hours |
| Movement features | Two parallel barrels, stepped bridges and suspended balance wheel |
| Finishing | Microbead-blasted minute and balance bridges with hand-polished edges |
| Colour options | Orange, black, blue, purple, white, yellow and turquoise gaskets with matching leather straps |
| Customisation | Caseback gasket and matching strap can be changed by an ArtyA retailer |
| Production | Limited to 99 pieces |
| Price | CHF 49,900, EUR 55,000 or USD 61,000 excluding tax |
The Purity Curvy HMS Sapphire Sport Edition is most compelling as a transparent case study in how ArtyA builds personality into architecture.
It’s a niche watch, certainly, but for a collector who wants sapphire construction, visible mechanics and colour that can be changed without losing the clarity of the case, that niche is exactly the point.
