Iolite is one of the most unique gemstones in the world, not only because of its beautiful violet-blue colors but also due to its strong pleochroism—its ability to show three distinct colors when viewed from different angles. But iolite is not a single type of stone. It comes in many variations, each with its own beauty, rarity, and value.

In this detailed guide, you will learn about:

• All major types of iolite

• Their color variations

• Rarity and value

• How to identify them

• Where they are found

• Best uses of each type

Let’s dive into the fascinating world of iolite varieties.

1. Deep Blue Iolite (Premium Grade)

1.1 Description

This is the most desirable and valuable type of iolite. It displays a rich deep violet-blue color, similar to high-grade sapphire. In clean lighting, it shows excellent saturation and a sharp trichroic effect.

1.2 Characteristics

• Sapphire-like royal blue

• High transparency

• Strong pleochroism (blue, violet, grey)

• Minimal inclusions

1.3 Rarity

Moderately rare, especially in large sizes above 4–5 carats.

1.4 Best Uses

• Premium jewelry

• Engagement rings

• Collector pieces

2. Medium Blue Iolite (Standard Grade)

2.1 Description

This is the most widely available commercial grade of iolite. The color is medium to strong violet-blue, very attractive and perfect for everyday jewelry.

2.2 Characteristics

• Medium blue with violet hints

• Good clarity

• Visible pleochroism but not too strong

• Affordable and widely used

2.3 Rarity

Common and affordable.

2.4 Best Uses

• Rings

• Earrings

• Bracelets

• Mass-market jewelry

3. Light Blue Iolite (Pastel Iolite)

3.1 Description

Also known as pastel iolite, this variety has a lighter, soft bluish-grey tint. It is popular in minimalist and modern jewelry styles.

3.2 Characteristics

• Light violet-blue to bluish-grey

• Very subtle pleochroism

• High brilliance when cut well

3.3 Rarity

Abundant.

3.4 Best Uses

• Minimalist jewelry

• Fashion jewelry

• Beaded necklaces

4. Grey-Violet Iolite

4.1 Description

This variety leans more towards grey and violet than pure blue. Its unique shade makes it popular in artisan and contemporary jewelry.

4.2 Characteristics

• Smokey violet-grey

• Moderate pleochroism

• Often eye-clean

4.3 Rarity

Common.

4.4 Best Uses

• Designer jewelry

• Pendants

• Men’s jewelry collections

5. Yellow-Brown Pleochroic Iolite

5.1 Description

This is not a separate gemstone variety but one of the three pleochroic colors visible when rotating real iolite. In certain angles or thin slices, iolite shows a warm yellow-brown color.

5.2 Characteristics

• Appears golden, brown, or honey-yellow from specific angles

• A scientific and visual confirmation of authenticity

5.3 Rarity

Not rare (natural optical effect).

5.4 Uses

• Gemstone identification

• Educational demonstrations

• Collector interest

6. Iolite Sunstone (A Rare Hybrid Variety)

6.1 Description

A rare and highly prized variety found mainly in India and the USA, iolite sunstone contains sparkling copper-like inclusions (aventurescence) similar to Oregon Sunstone.

6.2 Characteristics

• Blue or grey base color

• Glittering inclusions (sparkling effect)

• Strong visual appeal

• Usually translucent

6.3 Rarity

Rare and sought-after by collectors.

6.4 Best Uses

• Unique jewelry

• Collector specimens

• Statement pieces

7. Bloodshot Iolite (Hematoid Iolite)

7.1 Description

This variety contains iron-rich inclusions that create reddish internal flashes or spots, giving it a “bloodshot” appearance.

7.2 Characteristics

• Blue to grey base color

• Red, brown, or rust-colored internal patterns

• Very unique and artistic appearance

7.3 Rarity

Uncommon, found mainly in India and Africa.

7.4 Best Uses

• Collector stones

• Artistic jewelry