Name any three gemstones. Give their colours and name the metals present in each of them which is responsible for the colour.

Explanation

To answer the question, we will identify three gemstones, their colors, and the metals responsible for those colors.

### Step-by-Step Solution:

1. **Identify the Gemstones**: We will choose three well-known gemstones.
- **Ruby**
- **Topaz**
- **Emerald**
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