Ceylon Sapphire Inclusions

First Published: 7 September 2026

Ceylon Sapphire Inclusions

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

Uniaxial interference figure in blue sapphire.
When a silky sapphire is heated to a high enough temperature, titanium from the rutile silk is forced into solid solution, coloring the stone blue. But the silk may also contain other elements that cannot dissolve into sapphire so readily, leaving behind silk “skeletons,” as shown here.
Birefringent crystal in transmitted light. If examined between crossed polars, it will reveal its doubly refractive nature.
A transparent birefringent crystal reveals its doubly refractive nature when examined between crossed polars in this untreated sapphire from Sri Lanka.
A lovely example of a fingerprint in an unheated sapphire from Sri Lanka.
Negative crystal with a carbon dioxide bubble and graphite crystal in an unheated Sri Lanka sapphire. Such inclusions cannot tolerate heat treatment and thus are proof of natural, unheated origin.
A crystal cut through on surface is strikingly iridescent when examined between crossed polars in this untreated sapphire from Sri Lanka.
Rutile consists of titanium dioxide. When a sapphire containing exsolved rutile silk is heated, the rutile melts, sending the titanium back into solution, coloring the stone blue around the now partially dissolved silk. This creates a classic “inkspot” internal diffusion pattern, and is proof of high-temperature heat treatment.
A crystal embedded in a fingerprint produces a brilliant reflection in this unheated sapphire from Sri Lanka.
A black uraninite crystal with stress halo due to radiation is a common inclusion in Sri Lanka sapphire. Rutile silk is also visible below.
A black uraninite crystal with stress halo due to radiation is a common inclusion in Sri Lanka sapphire.
A euhedral birefringent crystal floats against a canvas of rutile silk in this untreated sapphire from Sri Lanka.

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Ceylon 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 Sri Lankan origin.

Ceylon Sapphire Inclusion Photomicrographs

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

What Inclusions Can Reveal About Ceylon 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 Sri Lankan origin.

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