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.

A graphite crystal is encapsulated within a negative crystal in this unheated Ceylon sapphire. On the left we can see iridescent flecks of undissolved “silk,” providing further evidence that the stone is untreated.
A graphite crystal is encapsulated within a negative crystal in this unheated Ceylon sapphire.
In the foreground on the left, a spall mark is visible, providing a piece of evidence that this stone was heated. Although it looks like a small water droplet, it is “frozen” in place and cannot be rubbed or scraped off. In the background, we also see a shiny melted crystal “discoid,” confirming that the stone is heated.
Elongated negative crystals filled with a birefringent substance glow in this Sri Lankan sapphire in crossed polars.
An elongated negative crystal filled with a birefringent substance glows in this Sri Lankan sapphire in crossed polars.
Heat-altered fingerprint in a heat-treated yellow sapphire from Sri Lanka. Note the small burst clouds around the fingerprint channels.
This image clearly illustrates what master photomicrographer John Koivula has termed “chromophore cannibalization.” As titanium is drawn out of solid solution to form exsolved rutile silk, the area in the vicinity is decolorized, losing its blue color. This is a natural process and is the reverse of “internal diffusion,” where heat treatment sends the titanium back into solution, creating blue clouds or “inkspots” around the rutile remnants.
A lovely fingerprint explodes with iridescent color when illuminated obliquely with a fiber-optic light. The rectilinear healing pattern of this liquid inclusion reveals that it lies along a prism face (parallel to the c axis).
A butterfly takes flight within the inner space of a sapphire from Serendib. Iridescent healed fissure.
This iridescent inclusion in a Sri Lankan sapphire is a remnant of a fissure that has healed shut over millions of years. The trapped fluids in these types of inclusions can provide geologists and geochemists with valuable clues about the origins of the planet.
A delightful sight. This pinkish purple sapphire from Serendib features a lovely iridescent fingerprint, its structure mimicing the underlying atomic pattern of its host.

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.

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