The gemstone ruby is actually ___ with traces of some other elements

The gemstone ruby is actually ___ with traces of some other elements

قیمتی پتھر روبی دراصل ___ ہے جس میں کچھ دوسرے عناصر کے نشانات ہیں۔
Explanation

Rubies are scientifically known as corundum, a rock-forming mineral and crystalline form of aluminium oxide which is two aluminium atoms and three oxygen atoms (Al2O3) in a close packed hexagonal structure.

Corundum typically contains traces of iron, titanium, vanadium and/or chromium.