A to Z of Gemstones: H: Heliodor


Gemstone family: Beryl

Crystal System: Hexagonal

Moh's scale of hardness: 9

Lustre: Vitreous

About: Heliodor is part of the Beryl range of gemstones. The colour ranges from orangey-yellow to greenish-yellow with transparent to semi-translucent appearance.

Origin: The main sources of Heliodor are: Brazil, Namibia, Madagascar and Russia.

Use in jewellery: Heliodor’s lustre and hardness makes it suitable for jewellery that has secure settings to protect the stone from wear.

Treatments, synthetics and imitations: The most common treatment for heliodor is heating in order to enhance their colour.  Materials that are most commonly used to imitate heliodor are citrine and glass