Sapphire Inclusions

First Published: 7 September 2026

Sapphire Inclusions

Explore sapphire inclusions in Hyperion, the Lotus Gemology inclusion database. Hyperion contains photomicrographs of inclusions and internal features in natural sapphire, documented with information on geographic origin, treatment, lighting conditions, field of view, photographer and published references.

Undissolved rutile “silk” needles, as pictured here, are a hallmark of rubies from Myanmar’s Mogok region.
Undissolved rutile “silk” needles, as pictured here, are a hallmark of rubies from Myanmar’s Mogok region.
The frosted surface of this large crystal and drippy, melted appearance of the associated fingerprint provide evidence that this sapphire has undergone heat treatment.
Undissolved rutile silk needles, as seen here, provide evidence that their host sapphire has not been heated at high temperatures.
The terraced patterns on the surface of this metallic crystal made it stand out in its host sapphire. Specimen courtesy Ayub Muhammad.
Confetti-like platelets and fine, unbroken needles can be viewed in this untreated sapphire.
This untreated sapphire contains a cluster of small, transparent crystals appears to float amidst a cloud of fine silk needles.
This large crystal is an interesting feature in its sapphire host thanks to the striking geometric growth pattern on its surface. It is likely that this is a sulphide crystal.
The glassy discoids shown here provides strong evidence that their yellow sapphire host was heated.
The melted crystal shown here provides strong evidence that its yellow sapphire host was heated.
Dense texture clouds, as depicted here, are the hallmark of Kashmir sapphire, giving these stones their famed “velvety” appearance.
This heated pink sapphire displayed a bold chalky angular zoning pattern interspersed with its strong red fluorescence when observed in shortwave illumination.

Sapphire inclusions may include mineral crystals, rutile silk, healed fissures, fluid inclusions, negative crystals, color zoning and other features formed during or after crystal growth. Such features are important to gemologists because they can provide evidence useful in identifying sapphire, understanding its geological history, recognizing treatment and, in some cases, determining geographic origin.

Sapphire Inclusion Photomicrographs

The Hyperion sapphire gallery includes microscopic features found in sapphires from major deposits around the world. Each entry is accompanied by descriptive information and, where available, references to the gemological literature.

What Inclusions Can Reveal About Sapphire

Inclusions are an important part of sapphire identification. Their form, composition, orientation and alteration can help gemologists distinguish natural sapphire from synthetic material, recognize evidence of heat treatment, and study the geological environment in which the sapphire formed.

Hyperion combines inclusion photomicrography with supporting gemological information so that individual features can be compared with documented examples from known sapphire deposits.

About Hyperion

Hyperion is the Lotus Gemology searchable inclusion database. It allows users to browse gemstone inclusions by gem type, geographic origin, treatment and keyword.

Search the Complete Hyperion Database