Madagascar Sapphire Inclusions

First Published: 7 September 2026

Madagascar Sapphire Inclusions

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

Angular zoned chalky shortwave fluorescent reaction, indicative of heat treatment.
Often chalky shortwave fluorescence is a sign of heat treatment in sapphire, but some stones from Madagascar, like this one, show a superficially chalky patch that is not associated with heat treatment.
This crystal appears black with darkfield illumination, but when observed with diffuse fiber optic light we can see it has a metallic luster.
“Superficial” patches of chalky shortwave fluorescence are occasionally found in Madagascar sapphire. These tend to have very sharp edges and appear just on the surface.
When viewed with dark-field illumination, the glassy tension halos around each monazite crystal are more distinct.
Brown monazite crystals are sometimes found in sapphires from Madagascar’s Ilakaka region. In this gem one can see glassy tension halos around each, indicating that the gem was subjected to low temperature (less than 1400°C) heat treatment.
We often find growth tubes in Madagascar sapphire. This example is particularly striking with a stark, etched appearance.
Demonstrating that the inner world can be as captivating as that outside, this Madagascar sapphire displays a small fingerprint scar with a beguiling moiré pattern. The undamaged nature of this inclusion testifies to the natural, untreated origin of the gem.
The concept of chromophore cannibalization is clearly illustrated in this photomicrograph of an untreated Madagascar sapphire. When zoned clouds of tiny exsolved inclusions are seen in transmitted light, they are found to be in decolorized areas, while blue areas are cloud free. The reason is that the tiny particles sucked titanium atoms out of solution, “cannibalizing” these potential chromophores.
Madagascar sapphires often contain zircon crystals. More typically we see them in rounded, oval forms, but occasionally we find an example of a blocky zircon crystal like this one.
Angular zoned chalky shortwave fluorescence provides evidence that this Madagascar sapphire was heated.
Angular zoned chalky shortwave fluorescence provides evidence that this Madagascar sapphire was heated.

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Madagascar sapphire inclusions may include mineral crystals, rutile silk, healed fissures, fluid inclusions, negative crystals, growth features and other internal features formed during or after crystal growth. Such features are important to gemologists because they can provide evidence useful in identifying sapphire and evaluating a possible Madagascar origin.

Madagascar Sapphire Inclusion Photomicrographs

The Hyperion Madagascar sapphire gallery includes microscopic features documented in sapphires from Madagascar. Each entry is accompanied by descriptive information and, where available, references to the gemological literature.

What Inclusions Can Reveal About Madagascar Sapphire

Inclusions are an important part of geographic origin determination in sapphire. Their form, composition, orientation and associations can provide evidence that, when considered together with other gemological properties, may support or contradict a Madagascar origin.

Hyperion combines inclusion photomicrography with supporting gemological information so that individual features can be compared with documented examples from Madagascar sapphires.

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.