Tourmaline · Cuprian neon
Paraíba Tourmaline
The glow of the tropics.
Certified · traceable origin
Typical size: 0.5 – 3 ct · Price on request
Specifications
- Mineral family
- Tourmaline group
- Composition
- (Na,Ca)(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈ : Cu
- Hardness (Mohs)
- 7 – 7.5
- Refractive index
- 1.603 – 1.655
- Crystal system
- Trigonal
- Colour
- Neon blue to green, coloured by copper
- Typical origins
- Brazil · Mozambique · Nigeria
Specifications are general gemological references for the species; each stone is assessed and documented individually.
Origin & story
Paraíba tourmaline is coloured by copper, producing an electric blue-to-green glow unlike any other gem. Since its discovery it has become one of the most sought-after and valuable stones in the world.
African sources, including Mozambique and Nigeria, now yield cuprian tourmaline of remarkable colour. SOMSTONE evaluates each stone for the vividness and saturation that define Paraíba.
Documentation
What to expect from a lab report
Where appropriate, stones are submitted to an independent gemological laboratory. A typical identification report records the fields below; values shown here are placeholders for illustration only and do not describe a specific stone.
Illustrative only. Not an actual certificate. Reports are issued by independent laboratories on a per-stone basis.
Sample — illustrative layout
Specifications · Paraíba Tourmaline
Report no. SAMPLE-000000
Date DD · MM · YYYY
- Identification
- Tourmaline group
- Variety
- Paraíba Tourmaline
- Weight
- —.— ct
- Dimensions
- —.— × —.— × —.— mm
- Shape / cut
- —
- Colour
- Neon blue to green, coloured by copper
- Transparency
- Transparent
- Origin opinion
- Subject to laboratory analysis
- Treatment
- Subject to laboratory analysis
- Comments
- Issued with stone-specific measurements and photographs.
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