Natural GreenTourmaline Rough · 1.499 ct · For Faceting · Unheated

$12.28

Natural Green Tourmaline rough weighing 1.499 ct and measuring 11.4 × 4.1 × 2.8 mm. This transparent specimen displays an attractive bright green to bluish-green colour, with natural inclusions, growth features and minor fissures typical of untreated rough material. Its elongated form offers very good potential for faceting, lapidary work or rough gemstone jewellery. Unheated and untreated.

1 in stock

NGB Reference: NGB-000749 SKU: RO-TOUR025BG-002-440 Category: Brand:
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This natural Green Tourmaline rough weighs 1.499 carats and displays an attractive bright green colour with subtle bluish-green tonal influence. Its transparent character and elongated natural form make it suitable for faceting, lapidary work, rough gemstone jewellery or collection purposes.

Measuring approximately 11.4 × 4.1 × 2.8 mm, the specimen has a distinctly elongated and relatively slender profile. This geometry may favour elongated faceted designs, although the final shape and recoverable carat weight will depend on crystal orientation, internal characteristics and the cutter’s approach to yield optimisation.

The material is transparent, allowing useful examination of the interior before cutting. Its bright green to slightly bluish-green colour gives the rough a lively visual appearance and may produce subtle tonal variation when viewed from different directions due to the natural pleochroism of Tourmaline.

Green Tourmaline is traditionally known in the gemstone trade as Verdelite, a colour-variety designation for green members of the Tourmaline group. The exact mineral species within the group should only be assigned when specifically confirmed through mineralogical testing.

Natural internal inclusions, growth structures and minor fissures may be present and should be considered carefully during orientation and preforming. The relatively narrow depth of

Overall Score: 89/100

NGB Grade: Very Good

Quality Evaluation

Natural Characteristics18.0/20
Inclusion Profile17.0/20
Faceting Potential18.0/20
Usable Yield / Shape Potential18.0/20
Overall Rough Quality18.0/20

Evaluation Notes

This natural Green Tourmaline rough presents a **very good overall faceting-quality profile**, combining attractive bright bluish-green colour with good transparency and a useful elongated crystal form. Fine natural inclusions, internal growth features and minor fissures are present, but they do not significantly reduce the overall visual quality of the rough.

The elongated proportions provide good potential for an elegant narrow faceted design, although the relatively shallow **2.8 mm depth** requires careful orientation and yield planning to preserve as much usable material as possible. The bright colour and transparent body are significant strengths, while the natural rough surfaces and internal characteristics remain manageable from a cutting perspective.

Overall, the combination of colour, transparency, faceting potential and usable crystal form, balanced against the limited depth and resulting yield considerations, supports a strong **89/100 assessment**.

Species

Tourmaline

Gemstone Variety

Tourmaline

Gemstone Sub-variety

Verdelite

Color

Green

Treatment

Unheated, Untreated

Transparency

Transparent

Gemological Properties

Carat Weight1.499 ct
Dimensions11.4 × 4.1 × 2.8 mm
TransparencyTransparent
ClarityN/A
Refractive Index1.620–1.650
Specific Gravity3.02–3.26
Hardness7,5 Mohs
Birefringence0.020
Crystal SystemTrigonal
Dispersion0.017
LusterNot Graded in Rough State
Color Descriptionbright green (bluish influence)
Transparency NotesTransparent. The recorded transparency is considered together with the specimen’s individual internal characteristics.
Natural CharacteristicsFine natural inclusions, internal growth features and minor fissures may be visible within the transparent Green Tourmaline rough. The elongated crystal fragment also shows natural surface irregularities and uneven rough faces typical of unpolished material. The bright green to slightly bluish-green colour remains clearly expressed, while the relatively slender **2.8 mm depth** should be considered carefully during orientation and yield planning for faceting.

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