Emerald -

: It ranks between 7.5 and 8 on the Mohs scale , making it durable but prone to internal inclusions that can affect its toughness.

In the world of alchemy and ancient philosophy, the (Tabula Smaragdina) is a foundational text attributed to the legendary sage Hermes Trismegistus. emerald

: It is said to contain the "secrets of the universe," including the famous hermetic principle: "As above, so below" . : It ranks between 7

: While legends claim it was carved into actual emerald, scholars trace its written origins to Arabic treatises from the 7th to 9th centuries. The Aesthetic: Emerald Green emerald