Diamond Retinal is Cyrène’s progressive retinal serum system, available in five strengths - 1, 3, 5, 10 and 25 - for different levels of skin sensitivity and vitamin A experience.
The range was developed to replace a one-strength-fits-all approach with a more considered progression. Each level combines microencapsulated retinal with a sophisticated supporting formula, allowing retinal care to evolve as the skin becomes more experienced.
Founded by cosmetic scientist Shirin Koseoglu, Cyrène brings more than 20 years of formulation experience to advanced, multi-active skincare designed to support long-term skin quality.
Understanding retinal
Retinal, or retinaldehyde, belongs to the vitamin A family. In the skin’s conversion pathway, it requires one fewer step than retinol before reaching retinoic acid, the biologically active form of vitamin A.
A well-designed retinal product depends on more than the active itself. Stability, concentration, delivery technology, texture and the ingredients surrounding retinal all contribute to efficacy, tolerance and consistency of use.
Why a progressive retinal system?
Skin does not begin with the same level of sensitivity, resilience or previous retinoid exposure. A progressive system allows an entry strength to be selected more thoughtfully and adjusted over time.
Diamond Retinal offers five graduated levels so that sensitive beginners, established users and highly experienced vitamin A routines can remain within one coherent system.
The five Diamond Retinal levels
Diamond Retinal 1
The lowest level in the range, developed for very sensitive, reactive or redness-prone skin and for those who have previously struggled with conventional retinol products.
Where rosacea is diagnosed or redness is active, professional medical advice is recommended before introducing a retinoid.
Diamond Retinal 3
An introductory retinal strength for those beginning a regular vitamin A routine, or progressing from the most sensitive level.
Diamond Retinal 5
A mid-level formula for established retinal routines, designed to support visible refinement in texture, clarity and early signs of skin ageing.
Diamond Retinal 10
An advanced multi-active retinal formula for experienced users. Alongside retinal, it features niacinamide, pure and stabilised vitamin C, hyaluronic acid, squalane, vitamin E and skin-supporting peptides.
The formula is designed to address several visible concerns at once, including established lines, uneven pigmentation, dullness, irregular texture and loss of firmness, while supporting hydration and comfort.
Diamond Retinal 25
The highest level within the range, intended for highly experienced retinal use and carefully controlled progression. It is not an introductory product.
More than a single-active retinal serum
Diamond Retinal is formulated around a multi-active philosophy. Retinal is supported by complementary ingredients selected to help improve overall skin quality, not simply to increase active intensity.
Across the range, this approach connects visible renewal with hydration, antioxidant support, skin comfort and a more refined sensory experience.
Microencapsulation and gradual delivery
Retinal is an effective but inherently sensitive ingredient. Diamond Retinal uses microencapsulation and a phospholipid-based delivery approach to help support stability and gradual delivery within the formulation.
This technology is part of a wider formulation strategy designed to balance visible performance with a more considered user experience.
Visible benefits of a consistent retinal routine
With appropriate and continued use, Diamond Retinal helps improve the visible appearance of fine lines, wrinkles, uneven pigmentation, dullness, irregular texture and loss of firmness.
The skin can appear smoother, brighter, more even and more refined over time. Consistency, an appropriate strength and daily sun protection remain essential.
How to use Diamond Retinal
Apply in the evening to clean, dry skin, avoiding the immediate eye area and the corners of the nose and mouth. Follow with a moisturiser where needed.
Begin two evenings per week and increase gradually according to tolerance. Do not combine with another retinoid in the same routine, and take care when using strong exfoliating acids.
Apply broad-spectrum, high-protection sunscreen every morning. Retinoids are generally avoided during pregnancy and breastfeeding unless advised otherwise by a medical professional.
How to progress through the system
Remain at the current level until it can be used consistently without persistent redness, burning, excessive dryness or peeling. Progression should reflect the skin’s response rather than a fixed timetable.
The aim is not to reach the highest number as quickly as possible. It is to find the most effective level that can be maintained comfortably.
Retinal and long-term skin quality
A progressive retinal routine can form part of a broader approach to skin longevity: supporting visible renewal while maintaining hydration, barrier care and daily photoprotection.
Diamond Retinal is designed to sit within this complete routine, rather than function as an isolated high-intensity treatment.
Frequently asked questions
What is the difference between retinal and retinol?
Both are vitamin A derivatives. Retinal requires one fewer conversion step than retinol before reaching retinoic acid. The finished formula, concentration and delivery system remain important to the overall result.
Which Diamond Retinal level is suitable for beginners?
Diamond Retinal 1 is the gentlest entry level for very sensitive or reactive skin. Diamond Retinal 3 is an introductory option for those new to retinal without marked sensitivity.
How often should retinal be used?
Begin with two evening applications per week. Frequency can be increased gradually if the skin remains comfortable.
Should retinal be used with moisturiser?
Yes. A well-chosen moisturiser can support hydration, comfort and the skin barrier as retinal is introduced.
When should I move to a stronger retinal?
Consider progression only after the current level has been used consistently and comfortably. Higher strength should never be prioritised over tolerance.
Five strengths. One intelligent system.
Diamond Retinal combines carefully graduated strengths with multi-active formulation science, creating a structured pathway from sensitive introduction to advanced vitamin A care.
Advanced results, guided by the skin.
Discover the Diamond Retinal range available in Europe