ENCYCLOPEDIA · SKYJEMS

Mozambique Ruby — Heat Treatment and Laboratory Reports

Key concepts

mozambique ruby, heated ruby, montepuez ruby, african ruby

The Montepuez deposit in Mozambique is a highly productive source of gem-quality ruby. In the inventory test dated 2026-08-03, three Skyjems listings matched the combined filters for Mozambique origin, heat treatment and an accepted outside laboratory. Inventory changes, so check each current listing and its documentation.

Why Mozambique ruby matters

Mozambique ruby from Montepuez is a significant source of gem-quality ruby. Heat treatment can reduce blue undertones, shifting purplish red toward red.

What heating does to Mozambique ruby

Heat treatment is one of the enhancement methods used for Mozambique ruby. It can reduce blue undertones. For any stone, review the laboratory report for treatment disclosure.

Origin determination

Gemological laboratories such as GIA can issue origin opinions for rubies. Review the exact laboratory report for any stone being considered.

Skyjems inventory snapshot

Browse Mozambique ruby at /collections/ruby. For current availability and pricing, check each listing and its accompanying documentation.

Private viewings and bespoke

Contact Skyjems at +1-416-366-3335 or request a private viewing.

Sources and further reading

• A Decade of Ruby from Mozambique (GIA-MOZ-RUBY-DECADE)
• Low-Temperature Heat Treatment of Mozambican Ruby (GIA-MOZ-RUBY-LOW-HEAT)
• Mozambique: A Ruby Discovery for the 21st Century (GIA-MOZ-RUBY-AVAILABILITY)
• GIA Colored Stone Research (GIA-COLORED-STONE-RESEARCH)