Oiled Emerald Inclusions

First Published: 7 September 2026

Oiled Emerald Inclusions

Explore oiled emerald inclusions in Hyperion, the Lotus Gemology inclusion database. Hyperion contains photomicrographs of inclusions and internal features in natural emeralds that have undergone fissure filling with colorless oil or resin, documented with information on geographic origin, treatment, lighting conditions, field of view, photographer and published references.

A crystal (likely mica) with an iridescent surface can be seen in this emerald.
A bouquet of iridescent thin films can be observed in this emerald from Russia.
A tourmaline rod (possibly fluor-dravite) and a few phlogopite mica crystals decorate the interior of this emerald from Zambia.
Two tourmaline crystals, one epigenetically stained with iron-oxides, are trapped with several blocky 2-phase inclusions in this Zambian emerald.
Iridescent thin films form a dramatic topographical scene in this emerald.
This schist-hosted emerald revealed an intriguing surface-reaching agglomeration of pyrochlore (high-than-host luster) and phlogopite mica (similar-to- and lower-than-host lusters); identified by micro Raman spectroscopy.
This crystal in an emerald looked just like a “B.” Perhaps that is fitting for a member of the “B”eryl family!
Irregularities in the crystal structure create the roiled “gota de aceite,” (Spanish for “drop of oil”) effect in this emerald. This effect is often associated with Colombian emeralds. Here crossed polars reveal strain patterns between the growth structures.
Irregularities in the crystal structure create the roiled “gota de aceite,” (Spanish for “drop of oil”) effect in this emerald. This effect is often associated with Colombian emeralds.
When this emerald was gently warmed with a hot point, droplets of resin began to leak out of the fissures. When illuminated with a long wave UV torch, the areas with resin display a chalky appearance, particularly where two large round droplets are concentrated.
When this emerald was gently warmed with a hot point, droplets of resin began to leak out of the fissures. These droplets can be observed with reflected light.
The thin films present in this Russian emerald show dazzling interference colors.

Search the Complete Hyperion Database

Emeralds commonly contain surface-reaching fissures that may be filled with colorless oil or resin to reduce their visibility. Microscopic examination may reveal features associated with such filling, including differences in relief, flash effects, trapped bubbles or incomplete filling within fissures.

Oiled Emerald Inclusion Photomicrographs

The Hyperion oiled emerald gallery includes microscopic features documented in natural emeralds recorded as having fissure filling with colorless oil or resin. Each entry identifies the recorded treatment and is accompanied by descriptive information and, where available, references to the gemological literature.

What Inclusions Can Reveal About Emerald Treatment

Microscopic examination is an important part of detecting fissure filling in emerald. The appearance of surface-reaching fissures and the materials within them can provide evidence of treatment and help gemologists assess the nature of the filling material.

Hyperion combines inclusion photomicrography with supporting gemological information so that treatment-related features can be compared with documented examples in natural emerald.

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.