Verneuil Synthetic Sapphire Inclusions

First Published: 7 September 2026

Verneuil (Flame Fushion) Synthetic Sapphire Inclusions

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

At first glance, this piece of “rough” sapphire looks convincingly natural with abrasions and fissures on the surface. But once it’s immersed in methylene iodide, curved growth zoning become obvious and reveal that the stone is a Verneuil synthetic.
The small pinpoints in this image are gas bubbles confirming the synthetic nature of this flame-fusion sapphire.
The most distinctive feature of hydrothermally grown synthetic corundum is wavy growth zoning.
Immersion in di-iodomethane, accompanied with a blue filter, reveals the curved color banding in this synthetic sapphire.
When a yellow sapphire is immersed in a yellow liquid like methylene iodide, it is difficult to see the growth zoning. Placement of a blue filter under the immersion cell provides the necessary contrast to easily spot features such as the curved color banding seen here, which proves this stone to be a Verneuil synthetic.
When a yellow sapphire is immersed in a yellow liquid like methylene iodide, it is difficult to see the growth zoning, as shown here.
Gas bubbles and short needles in a Linde synthetic star sapphire.
The engraved “L” on the back of a genuine Linde synthetic star ruby. All of the Linde production featured this branding.
Curved color banding in a Verneuil-grown synthetic sapphire.
This synthetic pink sapphire was fractured and then appeared to have been soaked in an iron-rich solution to created orange stains in the fissures, thus simulating padparadscha. The stains developed unusual dendritic patterns, as seen here. Chemical analysis also reveal traces of lead in the fissures.
This synthetic pink sapphire was fractured and then appeared to have been soaked in an iron-rich solution to created orange stains in the fissures, thus simulating padparadscha. The stains developed unusual dendritic patterns, as seen here. This fissure also shows an unusual shiny, glossy appearance. Chemical analysis also reveal traces of lead in the fissures.

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Verneuil (Flame Fushion) Synthetic Sapphire inclusions may include curved striae, curved color banding, gas bubbles, healed fissures, Plato lines, twinning, 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.

Verneuil (Flame Fushion) Synthetic Sapphire Inclusion Photomicrographs

The Hyperion Verneuil (Flame Fushion) synthetic sapphire gallery includes microscopic features found in rubies 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 Verneuil (Flame Fushion) Synthetic Sapphire

Inclusions are an important part of sapphire identification. Their form, composition, orientation and alteration can help gemologists distinguish natural Sapphire from Verneuil (Flame Fushion) 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 natural sapphire deposits and synthetic rubies.

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.