巴西蓝绿色碧玺 • 2.85 克拉 • 无底价 - 高度: 9 mm - 宽度: 7.5 mm- 0.57 g - (1)

DESCRIPTION:
This natural Tourmaline cross section from Minas Gerais is dominated by a broad bluish green to olive green body surrounding a much smaller pale central nucleus. Rather than presenting several equally sized colour bands, the specimen is visually defined by this contrast between the extensive green crystal body and the compact whitish centre, creating a clean and immediately readable internal architecture.

The main body displays an attractive combination of olive green, grass green and subtle bluish green nuances. Depending on orientation and illumination, some areas appear cooler and slightly blue toned, while others become warmer and more olive in character. Under transmitted light, the green becomes considerably brighter and more luminous, revealing the transparency of the material and strengthening the contrast with the central zone.

At the centre lies a compact milky white to very pale pinkish nucleus surrounded by a delicate transitional halo. This lighter core creates a striking focal point within the much larger green body and records a clear change in the crystal’s growth environment. Fine internal textures remain visible inside the nucleus, giving it a softly crystalline appearance rather than a completely uniform surface.

The section preserves a naturally irregular trigonal outline with broad rounded faces and visible lateral prism development. Fine longitudinal growth striations remain particularly evident along the sides, while the exposed cross section reveals internal growth structures, delicate veils and reflective textures. The vitreous lustre becomes especially attractive around the edges, where light produces bright flashes across the green material.

Its appeal lies in restraint rather than excessive colour complexity. The expansive bluish green body, small pale nucleus, strong translucency and preserved natural architecture create a balanced specimen with a distinctive identity. Originating from Minas Gerais, one of the world’s classic localities for coloured elbaite tourmaline, it offers an elegant example of natural colour zoning preserved within a complete crystal section.

SPECIFICATIONS:
• Weight: 0.57 g
• Weight in carats: 2.85 ct
• Dimensions: 9 × 7.5 × 4.5 mm
• Origin: Minas Gerais, Brazil
• Mineral species: Tourmaline
• Variety: Green Tourmaline
• Crystal system: Trigonal
• Form: Natural crystal cross section
• Crystal outline: Irregular rounded trigonal profile
• Main body colour: Bluish green to olive green
• Secondary tones: Grass green with cooler blue green nuances
• Core: Milky white to very pale pinkish central nucleus
• Colour zoning: Broad green body surrounding a compact pale core
• Transparency: Translucent to locally transparent
• Lustre: Vitreous
• Surface features: Natural growth textures and preserved lateral striations
• Internal features: Fine crystalline textures, veils and growth structures
• Treatment: None
• Condition: Natural, untreated crystal section

NOTABLE POINTS:
• Broad bluish green crystal body
The majority of the specimen is occupied by a rich green zone displaying subtle olive and cooler blue green variations.

• Compact pale central nucleus
A small milky white to very pale pinkish core creates a strong focal contrast against the surrounding green material.

• Strong colour dominance
Unlike multi banded slices, this specimen is characterised by one expansive green domain surrounding a much smaller central growth zone.

• Attractive transmitted light response
Backlighting increases the luminosity of the green body and makes the internal zoning considerably more pronounced.

• High translucency
Light penetrates efficiently through much of the specimen, revealing internal textures and increasing visual depth.

• Natural trigonal architecture
The rounded irregular outline retains the characteristic growth geometry of the original tourmaline crystal.

• Preserved lateral growth striations
Fine parallel lines along the prism surfaces clearly record the crystal’s natural longitudinal development.

• Vitreous edge brilliance
The outer surfaces produce bright reflective flashes that enhance both colour and transparency.

• Natural internal growth textures
Veils and crystalline structures remain visible within the section and add mineralogical character without obscuring its zoning.

• Classic Minas Gerais provenance
The specimen originates from one of the most internationally recognised regions for naturally coloured elbaite tourmaline.

COLLECTOR’S INTEREST:
This specimen is attractive precisely because its zoning is unusually simple and visually dominant: an extensive bluish green body surrounding a compact pale nucleus. The strong size contrast between these two growth zones creates a distinctive appearance that differs considerably from more conventional multicoloured Watermelon Tourmaline slices.

Its substantial 2.85 ct weight, high translucency, preserved trigonal architecture and clearly visible lateral growth striations further strengthen its collector interest, particularly for collections focused on Brazilian tourmaline and natural crystal zoning.

LAPIDARY POTENTIAL:
Although the transparent green material could technically offer limited lapidary possibilities, cutting would remove the pale central nucleus and the natural cross sectional architecture that gives this specimen its identity. Its strongest value therefore remains in its present form, where the contrast between the broad bluish green body and compact pale core can be appreciated exactly as it developed during crystal growth.

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Photography and transparency:
All photos were taken under controlled light conditions, carefully selected to reproduce the most accurate natural color of each specimen. No filters, color enhancement, or artificial saturation were applied. The lighting setup is used exclusively to represent the piece as it appears under neutral daylight, ensuring that buyers can appreciate its true tones and luster without distortion.

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