EXCEPTIONAL Fire Opal - Mexico 5.80 carats - NO RESERVE PRICE - Height: 17 mm - Width: 10 mm- 1.16 g - (1)

This exceptional natural Mexican fire opal of 5.80 carats, preserved within its matrix, is a particularly spectacular collectible specimen.

The stone reveals several opalescent zones showing a play of colors with remarkable intensity: electric green, golden yellow, incandescent orange, red, turquoise, and blue appear successively depending on the light direction.

The main area has a warm, almost solar dominant, with extremely bright green and orange flashes, while a second opalescent pocket unveils cooler tonalities, blending blue-green hues with red flashes. The contrast between these colors and the host rock remaining naturally attached to the opal creates a genuine window into its geologic formation.

Unlike a gem completely extracted from its environment, this specimen thus retains part of its original natural context, which greatly enhances its mineralogical and aesthetic interest.

Characteristics

- Stone: Natural Mexican fire opal
- Type: Precious opal in matrix
- Origin: Mexico
- Weight: 5.80 carats
- Dimensions: 17 × 10 × 5.4 mm
- Body color: Golden yellow to orange
- Visible color play: Electric green, yellow, orange, red, blue and turquoise
- Presentation: Opal naturally associated with its matrix
- Optical phenomenon: Play-of-color
- Treatment: None indicated
- Interest: Gemology, mineralogy, and collection

An extraordinary play of colors

The major feature of this piece is undoubtedly its extraordinary chromatic phenomenon.
In the central portion, a wide opalescent window reveals a profusion of particularly concentrated colors. Neon green flashes seem to emerge from a yellow-orange background, accompanied by smaller red and multicolored specks.
The second opalescent zone, located at the end of the specimen, offers a striking contrast: the hues become more blue and turquoise, crossed by green and red flashes.
This diversity gives the impression of observing several different opals gathered in a single piece.

Why do these colors appear?

The play of colors in precious opals is an optical phenomenon directly related to their microscopic structure. When the internal arrangement of the tiny silica spheres is sufficiently regular, visible light interacts with this architecture and certain wavelengths are diffracted.
The result is this spectacular array of colors that can change when the stone, the light source, or the observer moves.
It is precisely this phenomenon that distinguishes a true play-of-color opal from a common opal lacking this feature.

Mexico, a historically prestigious origin

Mexico holds a major place in the history of fire opal. The famous Mexican deposits produced some of the most emblematic orange and reddish opals in the world, to the point that fire opal is now deeply associated with the country’s gemmological tradition.
The mining of opal in Mexico has an ancient history, predating modern times. After a period of lower activity, commercial extraction saw a revival in the 19th century, helping to internationalize the extraordinary Mexican opals.
This historic provenance gives beautiful Mexican specimens an identity immediately recognizable in the world of collecting.

An opal still imprisoned in its rock

The presence of the natural matrix is particularly interesting on this specimen.
It allows us to observe the opal not merely as an isolated gem, but as the result of a geological process: silica-rich solutions circulated through the cracks and cavities of the rock before opaline matter gradually deposited there.

The specimen thus preserves a kind of three-dimensional photograph of its formation.
The various opalescent windows appear within the matrix as genuine pockets of color, making the piece especially interesting when viewed under a loupe or under directional lighting.

A visually spectacular piece

With 17 × 10 × 5.4 mm for 5.80 carats, this opal concentrates an impressive amount of detail into a very small volume.
Its aesthetic rests on three elements united in a single piece: the warm color characteristic of fire opal, a highly vivid multicolor play of colors, and the presence of its natural matrix.
Lighting then reveals, in succession, zones that are almost golden, neon green flashes, red specks, and blue-turquoise areas.

A true fragment of its deposit

An opal in matrix has a particular dimension for the collector: a part of the rock that accompanied its birth through geological time is still physically present around it.
Here, this natural association is particularly aesthetic as the matrix frames the different opalescent zones without masking their chromatic richness. It even enhances their intensity through contrast.
This 5.80-carat Mexican opal thus combines historic provenance, preserved geological context, and especially a spectacular multicolored color play: a true natural piece whose appearance continually changes with light and observation angle.

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