The shape of the Kalpa Donna case is the classic "tonneau", one of the first designs that Michel Parmigiani created for his brand. This form is based on the application of the golden ratio, a geometrical reference which provides a harmonious ratio of proportions. The case and its lugs, the angle of which has been carefully calculated to describe a perfect curve, sit ergonomically on the female wrist. The sides of the steel case are set with Top Wesselton diamonds of a rare purity.

The dial of the Kalpa Donna features guilloché work, reflecting the sun's rays. This motif also echoes the segmentation of the hours: the pattern becomes a form of index. The relief inherent in guilloché work accentuates the intensity of the colours applied to it. Ivory, amaranth, and metallic blue shimmer with a unique brilliance, perfectly complemented by a stone-set or plain steel bracelet, or a linen colour Hermès alligator strap.

There is an inherently feminine softness in the design and lines of the Kalpa Donna. The curve of the case extends to the rounded lugs in perfect harmony, emphasised by a striking setting of Top Wesselton diamonds. The numerals 6 and 12 on the dial, inspired by Art Nouveau, feature exuberant curves, evoking the softness of the female form.