250 ct Fire Opal Rough from Honduras

Item Information

Dimensions (mm) 83 x 35.5 x 23mm
Weight (carats) 250 carats
Colors

-This is a piece of rough fire opal from a new finding in Honduras.
-It is all wrapped in a natural protective soil layer. You can see the color only on one of the corners of the stone, but the stone is all opal. 
-I collected several kilograms in different sizes and weighs (up to 1 kilogram).
-This stone is untreated and dry.
-Has good color, with some transparency.
-Has fractures.
-A skilled cutter will be able detach several pieces from the cracks and facet them.
-All pictures are taken under natural sunlight when STONES ARE DRY.
-I checked the refractive index of a polished stone and it is 1.44 to 1.45.

-In his book ‘The World of Opals’ (1997), Allan W. Eckert writes: “San Antonio area mines are most productive of a very light-colored precious fire opal that most resembles the Mexican variety (...). Other opals of this type occur at a number of locations throughout the country (...). The stones here, mainly found loose on the ground surface, have a colorless transparent center which turns to transparent citrine yellow and, finally, near the outside edges to a transparent light brownish-orange. The majority is used for faceting purposes”.

-And Tom R. Barbour, C.G. wrote in The Lapidary Journal (April 1965): “Produced by hand and as yet on a small scale, there is in Honduras opal of almost every description including all of that found in Australia (...). Because of the very difficult mountainous country with little or no roads, Honduras has not been developed. However, with the promise of roads in this country in the comparatively near future, we hope it will turn into one of the main gem and opal producing areas of the world (...). In the first group we will include common opal or, in other words, that which does not display colors when viewed in reflected light. The ‘Mexican fire opal’ type is found in several places throughout Honduras (...). This opal is found in weathered veins of from one-fourth of an inch up to six inches in width. The outside, next to the matrix, is a light orange brown turning to lighter shades then to a citrine color with a clear center. Most of this type (...) is fractured into pieces from one-half inch to about two inches of clear faceting material”.

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Pricing & Details

Bid Increment $1
Starting Bid $1
Auction ID 694519
Watchers 4 watching
Viewed 273 times
Starts 19th Feb 2018 6:45am PST
Ends 23rd Feb 2018 6:45am PST

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