This natural Ametrine weighs 9.83 carats and is fashioned in an elegant octagonal emerald cut, presenting a distinctive combination of light pinkish-purple and light orangy-yellow colour zones within a single transparent Quartz crystal.
Measuring approximately 15.5 × 9.8 × 7.7 mm, the gemstone has an elongated geometric outline with substantial depth and a refined face-up presentation. The broad table and structured step-style faceting provide a clear view of the natural colour zoning while emphasising the gemstone’s clean internal appearance.
The stone displays approximately 40% light pinkish-purple coloration and 60% light orangy-yellow to golden coloration, with the warmer yellow zone concentrated mainly through the central portion of the gemstone. Subtle purplish influence within portions of the yellow zone creates additional tonal complexity, while golden reflections become visible as light interacts with the polished facets.
Ametrine is a naturally bicoloured variety of Quartz (SiO₂) in which Amethyst-type purple and Citrine-type yellow colour zones occur together within the same crystal. The distribution, boundary and orientation of these zones are natural growth characteristics and strongly influence the visual character of each individual gemstone.
In this specimen, the yellow-to-golden zone is visually dominant, while the lighter purple area provides contrasting colour along the stone. This asymmetrical but clearly expressed distribution gives the gemstone an individual bicolour appearance rather than a perfectly equal colour split.
The gemstone is transparent and presents a clarity comparable to approximately VS, with fine natural inclusions, subtle internal growth structures or minor healed fissures potentially visible under magnification. These characteristics have only a limited effect on overall transparency and face-up appearance.
The octagonal emerald cut is assessed as Very Good, providing strong geometric definition and an effective presentation of the colour zoning. Good symmetry maintains a balanced overall outline, while Good polish enhances the characteristic vitreous luster of Quartz and supports attractive internal reflections.
A tiny microscopic chip is present on the gemstone. It is extremely small and not readily visible during normal face-up observation, but Natural Gems Belgium records the feature for complete transparency. It should nevertheless be considered during close inspection, handling and jewellery setting.
The specimen is recorded as unheated, with its purple and yellow colour zoning presented in its naturally observed state without documented heat enhancement.
This gemstone originates from Bolivia, the classic and most important commercial source associated with naturally occurring gem-quality Ametrine.
With its 9.83 ct weight, transparent body and distinctive predominance of warm yellow-golden colour contrasted by light purple zoning, this natural Ametrine offers a highly individual interpretation of bicolour Quartz. Its very good emerald-style cutting and refined geometric appearance make it an attractive choice for custom jewellery or a carefully selected gemstone collection.
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