Question

which transition metal ions are responsible for color in ruby and emerald

Answer 1

When impurities are added to colorless gemstones, brilliant colors are frequently produced. When chromium is added to colorless corundum, a red ruby is born, and a green emerald emerges when chromium is added to colorless beryl.

Emeralds are formed when chromium, vanadium, and iron are present in the mineral beryl. The varying presence of these three elements gives emerald its range of color. ... Iron gives the stone a bluish tint. The most valuable emeralds are bluish-green to green and have a medium to medium-dark tone.