Osma Laboratoires — France's Last Alum Stone Manufacturer
Osma Laboratoires was founded in 1957 in the Lyon region as a pioneer in natural cosmetics. It is the last French manufacturer of alum stones, producing handcrafted shaving products with at least 95% natural ingredients.
Frequently Asked Questions about Osma Laboratoires
What is the history of Osma?
Osma Laboratoires was founded in 1957 in the Lyon region. For over 50 years, it has been active in the classic shaving industry. It is the last French manufacturer of alum stones, maintaining a unique traditional craftsmanship.
What is an alum stone?
Alum stone has been used for millennia — Egyptians, Greeks, Romans. It instantly stops bleeding from minor cuts, has antiseptic properties, soothes irritation, and tightens pores after shaving.
What certifications does it have?
Osma is the first company worldwide with COSMOS Nat certification for both raw materials and finished products. This guarantees 100% natural alum of the highest purity.
How are the products made?
All Osma stones are handmade in France. They are hand-cut and hand-polished for maximum smoothness on skin. Made from pure natural crystal — never from compressed powder or molds.
What are the key products?
Bloc Osma (75g) is the iconic product, recognized worldwide by barbers and wet shaving enthusiasts. The Osma Tradition range includes stones in various sizes, styptic sticks, and hemostatic products.
How is it used?
Wet the stone and gently glide it over your face after shaving. Leave for 1-2 minutes (you'll feel a slight tingling). Rinse with cold water and dry the stone for storage. The stone lasts for months.
✓ Authorised Osma Laboratoires retailer | ✓ Shipping worldwide | Updated: April 2026
