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.
Arrow-shaped rutile needles lie frozen within this unheated sapphire from Sri Lanka.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Diffuse Overhead
Photographer:
Richard W. Hughes •
Image Number:
A-001-0660-5
An arrow-shaped rutile needle lies frozen within this unheated sapphire from Sri Lanka. Note the small daughter crystal at the broad end.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Diffuse Overhead
Photographer:
Richard W. Hughes •
Image Number:
A-001-0660-4
Irregular crystals float above exsolved rutile silk in this untreated sapphire from Sri Lanka.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Transmitted
Photographer:
Richard W. Hughes •
Image Number:
A-001-0660-3
Small crystal plates against a backdrop of exsolved silk in this Sri Lankan sapphire.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Transmitted
Photographer:
Richard W. Hughes •
Image Number:
A-001-0660-2
Gübelin, E.J. (1973) Internal World of Gemstones. Zürich, ABC Verlag, reprinted 1983, 234 pp.; RWHL*.
A thin crystal plate alongside a brown crystal of what is probably phlogopite mica enhance the interior of this sapphire from Serendib.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Transmitted
Photographer:
Richard W. Hughes •
Image Number:
A-001-0660-1
Gübelin, E.J. (1973) Internal World of Gemstones. Zürich, ABC Verlag, reprinted 1983, 234 pp.; RWHL*.
Iron-rich silk in a black star sapphire from Chanthaburi, Thailand.
Natural Black Star Sapphire •
Thailand/Cambodia •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Diffuse Overhead
Photographer:
Richard W. Hughes •
Image Number:
A-001-0659-2
Iron-rich silk, in the form of exsolved plates within a sapphire from Tanzania’s Umba Valley.
Natural Sapphire •
Tanzania; Umba Valley •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Overhead
Photographer:
Richard W. Hughes •
Image Number:
A-001-0664-3
Iridescent needles within a sapphire from Tanzania’s Umba Valley.
Natural Sapphire •
Tanzania; Umba Valley •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Overhead
Photographer:
Richard W. Hughes •
Image Number:
A-001-0664-2
An iridescent fissure in a sapphire from Tanzania’s Umba Valley.
Natural Sapphire •
Tanzania; Umba Valley •
Enhancements:
None Detected (None) •
Lighting Conditions:
Fiber Optic: Overhead
Photographer:
Richard W. Hughes •
Image Number:
A-001-0664-1
A heat-induced discoid inclusion in a heat-treated sapphire from Sri Lanka.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
Heat (H) •
Lighting Conditions:
Fiber Optic: Oblique
Photographer:
Richard W. Hughes •
Image Number:
A-001-0642-1
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.
Natural Sapphire •
Sri Lanka (Ceylon) •
Enhancements:
Heat (H) •
Lighting Conditions:
Fiber Optic: Oblique
Photographer:
Richard W. Hughes •
Image Number:
A-001-0616-1
Nigeria sapphire; heated; crystal of what is probably rutile breaking the surface
Natural Sapphire •
Nigeria •
Enhancements:
Heat (H) •
Lighting Conditions:
Fiber Optic: Diffuse Overhead
Photographer:
Wimon Manorotkul •
Image Number:
A-001-0554-2
Hughes, R.W. (1997) Ruby & Sapphire. Boulder, CO, RWH Publishing, 512 pp.; RWHL*.
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.
