Gemini said Makhzan al-Adwiya (The Storehouse of Medicines)

Wearing it strengthens the heart and acts as a preventative against fear and dread. It is useful for facilitating childbirth and is beneficial for epilepsy. While using it as a tooth powder brightens the teeth, it is better to avoid this practice as it is poisonous.

The natural form and state of a diamond when it is extracted from the mine is generally octagonal or resembles a dodecahedron. Therefore, it is described as belonging to the "Tesseral" (cubic) system. A unique characteristic of its natural shape is that the surface of each face is slightly curved or domed, whereas the surfaces of other crystal-structured stones are often flat. There is a natural cleavage parallel to its sides, which makes it very easy to remove any defective parts. The natural shape of the diamond is usually not maintained; instead, it is cut into various shapes as required. It is fashioned into Brilliant, Rose, and Table cuts, though the Brilliant cut is the most suitable for it. Diamonds are also frequently cut into Rose and Table styles. Because the diamond possesses a high degree of hardness, it can achieve an excellent polish. It is due to this property of hardness that the great diamonds of ancient times have survived for us; if it were not for this hardness, we would not be able to see diamonds like the Koh-i-Noor or the Great Mogul after thousands of centuries.