Treated Sapphire Inclusions

First Published: 7 September 2026

Treated Sapphire Inclusions

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

The mottled appearance of these platelets suggests that their sapphire host was heat treated.
An angular zoned chalky fluorescent patch can be easily spotted when this heat-treated sapphire is observed in shortwave illumination.
The frosted surface of this large crystal and drippy, melted appearance of the associated fingerprint provide evidence that this sapphire has undergone heat treatment.
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.
This heated pink sapphire displayed a bold chalky angular zoning pattern interspersed with its strong red fluorescence when observed in shortwave illumination.
A small, chalky fluorescent patch can be observed when carefully examining this heated yellow sapphire in short wave UV illumination.
The healing pattern of this healed fissure in a Sri Lankan sapphire suggests it lies along a pyramid face, oblique to the c-axis. Should it lie perpendicular to the c-axis, the healing would reveal triangular or hexagonal healing; if parallel to the c-axis, the healing would be rectangular. Thus the nearly rectangular healing reveals its orientation along a pyramid face close to the c-axis. The use of oblique illumination reveals far more surface detail than ordinary dark or light field.
The angular chalky reaction, observable with short wave illumination, provides clear evidence that this blue sapphire was heated.
This elongated rose channel in a blue sapphire shows signs of heat treatment, with a series of glassy fissures visible across the stone. In the background we can observe many thin-film decrepitation halos.
A series of thin-film decrepitation halos decorates the interior of this blue sapphire.
A series of thin-film decrepitation halos decorates the interior of this blue sapphire.

Treatment can alter existing inclusions and produce new microscopic features in sapphire. These may include changes to mineral inclusions, altered rutile silk, tension fractures, healed fissures, residues and other features associated with heating, diffusion, fissure filling and other treatment processes.

Treated Sapphire Inclusion Photomicrographs

The Hyperion treated sapphire gallery includes microscopic features documented in natural sapphires subjected to treatment. Each entry identifies the recorded treatment and is accompanied by descriptive information and, where available, references to the gemological literature.

What Inclusions Can Reveal About Sapphire Treatment

Microscopic examination is an important part of detecting treatment in sapphire. The appearance and alteration of inclusions, fractures and growth features can provide evidence of treatment and, in some cases, information about the processes to which a sapphire has been subjected.

Hyperion combines inclusion photomicrography with supporting gemological information so that treatment-related features can be compared with documented examples in natural sapphire.

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.

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