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.

These green crystals were cut through on the surface of this untreated sapphire from Madagascar.
Angular growth zoning with clouds of fine particles and needles in an unheated Cyangugu sapphire.
Fingerprint with coarse negative crystals, some with mobile CO2 gas bubbles, in an unheated Cyangugu sapphire.
High relief primary negative crystal embedded in a secondary fingerprint in an untreated pink sapphire from Cyangugu, Rwanda.
Negative crystal at the center of an iridescent decrepitation fingerprint in an unheated Cyangugu sapphire.
Angular color zones form gray peaks in this untreated sapphire from Rubyvale, Queensland, Australia.
Zoned clouds of dark plates and short needles form stormy skies across this untreated sapphire from Rubyvale, Queensland, Australia.
Small crystal grains are surrounded by fissures amidst clouds of rutile silk in this sapphire from Lava Plains.
Large terraced crystals of what may be ilmenite, surrounded by fingerprints are visible in this Lava Plains sapphire.
Fine exsolved particles and milky zones outline the shape of the crystal as it grew in this unheated sapphire from Lava Plains.
A large flattened negative crystal is surrounded by an iridescent fingerprint in the basal plane of this unheated Lava Plains sapphire.
A small crystal with a frozen bubble is surrounded by a healed decrepitation halo, betraying the magmatic origin of this sapphire. The bubble results not from artificial heat treatment, but from the heat of the lava that lifted this sapphire crystal to the surface. Exsolved rutile dust can also be seen in the background.

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