Natural Chrome Tourmaline · 1.78 ct · Oval · Orangy Green · Unheated

This natural Chrome Tourmaline weighs 1.78 carats and is fashioned in an elegant oval mixed cut, combining an unusual yellowish-orangy green body colour with strong transparency and distinctive optical behaviour under changing illumination.

Measuring approximately 8.5 × 7.0 × 4.3 mm, the gemstone presents balanced proportions and a substantial face-up appearance suitable for individual jewellery design or gemstone collecting.

The stone displays a vibrant yellowish to orangy green body colour, with the appearance becoming brighter and showing stronger yellow tonal components under direct sunlight. Changes in illumination can alter the perceived balance between the yellow, orange and green components, giving the gemstone a dynamic visual character.

Chrome Tourmaline derives its characteristic green coloration primarily from chromium and/or vanadium within the Tourmaline structure. These chromophores can produce strong green colour and may also result in distinctive reactions under gemmological filters.

When examined through a Chelsea filter in combination with sunlight, this specimen shows a pronounced brownish-red to green response, with areas appearing strongly reddish or orange-red through the filter. This should be regarded as a diagnostic filter response rather than a conventional colour-change phenomenon, because the Chelsea filter selectively transmits specific wavelengths and alters the visible colour balance.

The gemstone is transparent and presents a clarity comparable to approximately SI1, with natural internal inclusions, subtle growth structures and minor healed fissures visible under magnification. These characteristics have a moderate but not dominant influence on transparency and face-up appearance.

The oval mixed cut is assessed as Good, with Good symmetry and Good polish supporting an attractive overall presentation. The polished facet surfaces produce a strong vitreous luster, particularly under direct sunlight, where the yellow and green tonal components become especially lively.

A tiny chip is present on the lower side of the gemstone. It is subtle and has limited influence on normal face-up observation, but it is fully documented and should be considered during handling and jewellery setting.

There are no indications of heating and no indications of any other treatment. The gemstone is therefore presented with its naturally observed colour and internal characteristics without documented enhancement.

With its unusual yellowish-orangy green colour, transparent body and distinctive response under changing illumination, this 1.78 ct natural Chrome Tourmaline offers strong gemmological and visual interest. Its lively sunlight appearance, attractive oval proportions and characteristic Chelsea-filter reaction make it an individual specimen for custom jewellery or a carefully selected gemstone collection.