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.

Thin film decrepitation inclusions create a firework display in this beryllium diffused orange sapphire. These likely developed as a consequence of the sapphire being heat treated.
Thin film decrepitation inclusions create a firework display in this beryllium diffused orange sapphire. These likely developed as a consequence of the sapphire being heat treated.
Thin film decrepitation inclusions create a firework display in this beryllium diffused orange sapphire. These likely developed as a consequence of the sapphire being heat treated.
The melted, bubbly texture of this fingerprint provides evidence that this Montana sapphire was heated. Sample courtesy Mike Gray.
This heated Montana sapphire contains a melted crystal in the center of a bubbly fingerprint. Sample courtesy Mike Gray.
A terrace-like structure on this stacked negative crystal creates a distinctive internal landscape in this untreated sapphire from Sri Lanka. The large flat faces are basal pinacoid faces, which lie perpendicular to the c-axis.
A tiny winged crystal, likely uraninite, peeks out from behind a fingerprint in this untreated Sri Lankan sapphire.
A cloud of irregularly shaped platelets creates a confetti-like appearance in this Songea sapphire. Specimen courtesy Nomad’s.
Mirroring the play of light on water, thin-film inclusions shimmer within this sapphire.
In yellow and orange sapphires from Chanthaburi, Thailand, a thin layer of iron-rich silk is often found just under the table.
A subtle sign of treatment. Ruby and sapphire surfaces often develop a melted texture when heated, sometimes forming “frozen” droplets that resemble water but cannot be wiped away. To minimize this appearance, stones are frequently repolished. In this case, a few facets were missed, leaving behind telltale signs of heat treatment.
As the gas bubble contracts under fiber-optic light heating, only prismatic dark crystals and diaspore needles remain in this negative crystal.

Search the Complete Hyperion Database

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.