This natural Yellow Opal is an attractive 39.80 carat rough gemstone displaying a warm orangey-yellow body colour with semi-translucent areas and subtle tonal variation throughout the material. Its substantial size and natural internal depth make it particularly interesting as rough material for faceting, cutting or specialist lapidary work.
Measuring approximately 29.9 × 18.9 × 17.8 mm, the specimen retains its natural irregular form, with visible fracture surfaces, uneven contours and internal structural variation characteristic of rough opal. The combination of warmer orange zones and lighter yellow areas gives the material a distinctive appearance and may offer different cutting possibilities depending on orientation and the cutter’s intended design.
Opal is a hydrated form of amorphous silica rather than a crystalline mineral. Its internal structure and water content contribute to its characteristic optical and physical behaviour. Unlike precious opal, this specimen is appreciated primarily for its saturated body colour, translucency and natural appearance rather than for play-of-colour.
The material is semi-translucent, allowing light to enter parts of the rough and reveal differences in density, colour and internal structure. These natural variations are important considerations when planning a finished stone and form part of the individual character of the specimen.
With a hardness of approximately 5.5 to 6.5 on the Mohs scale, opal requires more careful cutting, setting and handling than many harder gemstones. It can also be sensitive to impact, rapid temperature changes and dehydration, so controlled lapidary work and appropriate long-term care are recommended.
No indications of heating or other treatment are present. The stone is therefore presented as a natural, untreated Yellow Opal with its original colour, structure and rough characteristics preserved.
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