- Group
- Bourbon
- Breeder
- Joseph Schwartz, France, 1872
- Bud shape
- A dense, tightly rolled bud of carmine-pink colour.
- Open flower
- A deep, semi-globular cup in the characteristic 'shell' form — hence the nickname; petals curving inward.
- Colour
- Carmine-pink in bud, warm lilac-pink with a silvery underside as it opens; it lightens slightly with age.
- Fullness
- Very double, about 40 (up to 60) petals.
- Flower carriage
- Flowers often droop under their own weight, especially in hot weather.
- Flowering
- Remontant, in flushes through summer and autumn.
- Fragrance
- Strong, old-rose, with notes of lilac.
- Hips
- No data.
- Habit
- A slender, elegant bush.
- Branching
- No data.
- Shoots
- Flexible, able to bend under the weight of the flowers; can be lightly tied to a support if desired.
- Thorns
- Numerous large thorns of a reddish tint.
- Dimensions
- 150–200 × 90–120 cm.
- Support
- Not needed, although flexible canes can be tied for a tidier bush.
- Foliage
- No data.
- Resistance
- Weak — highly prone to black spot and powdery mildew; needs preventive treatment.
- Variations of the variety
- The parent forms are not known (no data); gave rise to the famous pearly sport Mme Pierre Oger.