# Iolite

> Iolite is a violet-blue silicate that changes color with the angle (7-7.5 on Mohs); often called “water sapphire” for its look.

- Source: https://www.711grados.com/en/iolite/
- Language: en
- Note: This entry was drafted with the help of AI and is pending review by the author.
- Published: 2026-08-17
- Updated: 2026-08-17
- Translation (es): https://www.711grados.com/es/iolita/
- Author: Sandra Sánchez
- Site: 711 Grados (https://www.711grados.com/)

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Iolite shows strong pleochroism: it looks violet blue, bluish gray or pale yellow depending on the angle it is viewed from. It is sometimes called “water sapphire”. A legend credits the Vikings with using iolite to navigate.

## Properties

- **Composition:** magnesium aluminum silicate (cordierite)
- **Hardness:** 7 to 7.5 on the Mohs scale.
- **Color:** violet blue; pleochroic.
- **Origins:** India, Sri Lanka, Madagascar and Brazil.
- **Treatments:** not usually treated.

## Uses in jewelry

- Rings, earrings and pendants.
- An affordable alternative to sapphire and tanzanite.
- Deep-colored jewelry.

## Pros and cons

### Advantages

- Intense blue at an affordable price.
- Hard enough for normal use.
- Cut in large sizes.

### Limitations

- Its color depends on the cut's angle.
- Has cleavage and can chip.
- Less sparkle than other blue gems.

## Care and cleaning

- Clean with lukewarm water and mild soap.
- Avoid hard knocks and ultrasonic if fractured.
- Store apart.

## See also

- [Gemstones in jewelry](https://www.711grados.com/en/gemstones-in-jewelry/)
- [Sapphire](https://www.711grados.com/en/sapphire/)
- [Amethyst](https://www.711grados.com/en/amethyst/)