Gemstone profile and identification guide

Watermelon Tourmaline

Watermelon tourmaline is a zoned tourmaline variety typically showing pink core and green rim coloration.

7.5 Mohs Green Rim, Pink Core Silicate (Tourmaline Group, usually Elbaite Color Zoning Variety)

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Overview

Watermelon tourmaline is a zoned tourmaline variety typically showing pink core and green rim coloration.

Did you know? Cross-section slices often show the most dramatic watermelon patterning.

Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.

Identification

Name: Watermelon Tourmaline

Scientific classification: Silicate (Tourmaline Group, usually Elbaite Color Zoning Variety)

Hardness: 7.5 Mohs

Transparency: transparent

Lustre: vitreous

Crystal system: Trigonal

Primary colour: Green Rim

Secondary colour: Pink Core

Colour family: Multi

Distinct concentric or bicolor zoning in tourmaline host is diagnostic.

Verification Status

Status: verified-core-fields

Reference priority: GIA, Gem-A, Mindat, International Gem Society

Core identity, locality, and physical-property fields reviewed against standard gemological references.

Trade-name and treatment-sensitive entries include explicit disclosure language where applicable.

Physical Properties

Hardness category: hard

Hardness value: 7.5 Mohs

Chemical composition: Lithium tourmaline composition, commonly elbaite with zoned chemistry

Crystal system: Trigonal

Common locations: Brazil, Afghanistan, Nigeria, Madagascar, Mozambique

Learn more: Gem-A gemstone education resources.

Colour Variations

Bi-color to tri-color tourmaline with pink center and green outer zones.

Optical effects: Color Zoning, Pleochroism

Detailed Gemology

Mineral species: Tourmaline (commonly elbaite zoning variety)

Mineral group: Tourmaline group

Chemical formula: Lithium tourmaline composition, commonly elbaite with zoned chemistry

Mohs hardness: 7.5

Crystal system: Trigonal

Lustre: vitreous

Transparency: transparent

Streak: White

Cleavage: Variable by species/material

Fracture: Conchoidal to uneven

Specific gravity: 3.0-3.2

Refractive index: 1.61-1.65

Optical phenomena: Color zoning and pleochroism

Colour range: Pink with green zoning combinations

Common inclusions: Species-dependent inclusions and growth features

Geological environment: Species-dependent

Principal mining regions: Brazil, Afghanistan, Nigeria, Madagascar, Mozambique

Important commercial sources: Watermelon tourmaline is a zoning descriptor, usually in elbaite from pegmatitic sources

Historical significance: Recognized in gemological and lapidary trade.

Common treatments: Treatment status varies by product; disclose when present.

Synthetic or imitation forms: Imitations may exist depending on species.

Common look-alikes: Species-dependent look-alikes.

Jewellery uses: Used in slices, faceted gems, and collector tourmaline pieces.

Care recommendations: Durable for jewelry; avoid hard impact on included stones.

Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Watermelon Tourmaline.

Formation

Evolving fluid chemistry during pegmatite growth creates concentric color zoning.

Origin

Watermelon tourmaline is a zoning descriptor, usually in elbaite from pegmatitic sources

Uses

Best for: Used in slices, faceted gems, and collector tourmaline pieces.

Ideal uses: Color-zoned designer jewelry and collector stones.

Care

Durable for jewelry; avoid hard impact on included stones.

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