Richard Mille is known for its limited edition watches, which often feature unique designs and rare materials. These limited releases are highly coveted by collectors, as they represent the pinnacle of the brand's creativity and exclusivity. The RM 56-02 Sapphire, for instance, is crafted entirely from sapphire crystal, making it a true work of art. Each limited edition piece is a testament to Richard Mille's commitment to pushing the boundaries of watchmaking and creating truly unique timepieces.