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.

Rose channels meeting at 86.1/93.9° angles in this sapphire create a striking geometric appearance.
This slightly yellowish crystal, embedded in a blue sapphire, was identified as hydroxylapatite with Raman spectroscopy. In the background we can also see Rose channels criss-crossing the stone.
By looking at the fingerprint in the interior of the stone, we can see how the naturals on this sapphire got their distinctive spotted texture.
Pargasite crystals, like the one pictured here whose identity was confirmed with Raman spectroscopy, are a well-known inclusion in Kashmir sapphire.
A brown phlogopite crystal (identified with micro Raman) is present inside this blue sapphire.
After analysis with Raman, we were able to confirm the identity of this pair of crystals as hydroxylapatite.
A pair of zircon crystals (identity confirmed with raman spectroscopy) are suspended in this blue sapphire that hails from Kashmir.
This white crystal in a star sapphire from Myanmar’s Mogok Stone Tract was identified as muscovite mica by micro Raman.
A series of flat negative crystals were found just beneath the surface of this star sapphire from Myanmar’s Mogok Stone Tract. Within many of them one can discern diaspore needles.
Florida, 2100.
Photomicrography is no different than ordinary photography. It’s all about controlling light. In this case, a nondescript fluid inclusion in dark-field illumination morphed into a spectral spectacular when light was brought from above.
The calcite crystal (identified with raman spectroscopy) pictured here has a triangular zoning pattern on one end.

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.