Gemstone Coloration: How Different Gemstones Get Their Colors

The video explains how gemstones get their colors, focusing on the role of light and chemical composition. It distinguishes between idiochromatic gemstones, which derive color from essential elements, and allochromatic gemstones, colored by impurities. The video also discusses how transition metal ions can alter gemstone colors by affecting energy levels and light absorption.

Why do gemstones appear to have different colors even if they have the same composition?

• They have different natural pigments

• Due to variations in light absorption

• They are made of different minerals

• Because they contain different dyes

What happens to a gemstone if it absorbs all wavelengths of visible light?

• It turns red

• It becomes transparent

• It looks black

• It appears white

What is a characteristic of idiom chromatic gemstones?

• They derive color from essential elements

• They are colored by impurities

• They are always colorless

• They can appear in multiple colors

Which element is responsible for the green color in Peridot?

• Copper

• Titanium

• Iron

• Chromium

How do impurities affect the color of rubies?

• They deepen the red color

• They have no effect on color

• They make rubies colorless

• They cause rubies to appear blue

What elements are responsible for the blue color in sapphires?

• Titanium and iron

• Magnesium and calcium

• Copper and zinc

• Iron and chromium

What is the role of trace elements in altering gemstone colors?

• They make gemstones harder

• They remove all color from gemstones

• They change the gemstone's structure and color

• They make gemstones more transparent