No, a sapphire is not a ruby, although they are closely related.
Understanding the Difference Between Sapphires and Rubies
While they might appear distinct, rubies and sapphires share a common origin. Both are varieties of the mineral corundum, composed of alumina and oxygen. The primary difference lies in their color.
Key Differences in Detail:
| Feature | Ruby | Sapphire |
|---|---|---|
| Mineral | Corundum | Corundum |
| Color | Red | Typically Blue, but can also be various other colors |
| Cause of Color | Chromium | Various trace elements (e.g. iron, titanium) |
As noted by the provided reference, "When a corundum is red, it is classified as a ruby, and when it's blue, it is called a sapphire."
Color Variations in Sapphires
- Blue Sapphires: The most common and well-known sapphire color is blue, caused by the presence of iron and titanium.
- Fancy Sapphires: Sapphires come in other colors, known as "fancy sapphires." These include pink, yellow, green, orange, and purple.
Why the Difference Matters
The color difference is crucial because it determines the classification of the gemstone. While both are corundum, a red corundum is a ruby, and a blue (or other color, excluding red) is a sapphire.
Conclusion
In conclusion, while both sapphires and rubies are varieties of the mineral corundum, a sapphire is not a ruby because they differ primarily in color. A red corundum is called a ruby, whereas a blue, or any other non-red colored corundum, is classified as a sapphire.
