12.63ct Pink Tourmaline rough, table view

12.63ct Pink Tourmaline rough, front right view

12.63ct Pink Tourmaline rough, back left view

12.63ct Pink Tourmaline rough, pavilion view

12.63ct Pink Tourmaline rough, back right view

12.63ct Pink Tourmaline rough, front left view

12.63CT Pink Tourmaline Faceting Rough | Uncut Gemstone

Name: 12.63CT Pink Tourmaline Faceting Rough
Brand: Jackson's Gems
SKU: sbESzDjCQac
Price: 151.56 USD
Availability: InStock

$151.56

Tanzanian 12.63CT pink tourmaline rough with green skin . Eye clean clarity, 12.3×11.72x11mm size. Recommended for a round shape.

1 in stock

SKU: sbESzDjCQac Categories: Tourmaline, Pink Tourmaline

Technical Specifications & Gemological Properties

Specifications for 12.63CT Pink Tourmaline Faceting Rough
Carat Weight	12.63CT
Dimensions	12.3 × 11.72 × 11mm
Origin	Tanzania
Treatment	None known
Color	Green (AB axis)
Clarity Grade	Eye Clean
Gem family	Tourmaline
Variety	Pink Tourmaline
Secondary color	Light Pink (C axis)
Recommended shapes	Round
Refractive Index	1.62–1.64 ^†
Hardness (Mohs)	7–7.5 ^†
Optic Character	Doubly refractive, uniaxial (−), birefringence 0.018–0.020 ^†
Pleochroism	Moderate to strong (dichroic) ^†
Specific Gravity	3.02–3.26 ^†

† Typical reference value for tourmaline; individual stones vary.

How to orient and cut this rough — Lapidary Guide

Description

Vibrant light pink tones mark this 12.63ct pink tourmaline rough from Tanzania. This stone is eye clean. A round is the recommended shape. The table should be cut to the c-axis to show the pink color face-up.

12.63CT Pink Tourmaline Rough Specifications

Lapidary notes: Open C-axis; Needs orientation for dichroism; Blocky shape for high yield; Clean rough

Cutting Notes

Orient the table parallel to the c-axis to bring the green hue to the top. The rough is blocky and clean, which supports a high yield for a round shape. Because the c-axis is open, you can establish your orientation early in the preforming stage to manage the dichroism between the green AB axis and the light pink C axis.

Work carefully to keep the stone cool during grinding, as tourmaline is heat sensitive. Avoid applying heavy pressure to prevent fractures in this brittle material. Be aware that the birefringence is high enough that facet edges may appear doubled. Since the critical angle is approximately 38 degrees, cut your pavilion angles above this limit to prevent windowing.

Cutter’s tip: The blocky dimensions are excellent for a round, but prioritize the c-axis orientation first to lock in the pink face-up color.

Every stone is filmed on video before it is listed, so what you see is the stone you get. For background on Pink Tourmaline, see the GIA Tourmaline guide. Browse more Pink Tourmaline faceting rough from Jackson’s Gems.

Related Guides

New to cutting Tourmaline? See the Lapidary Guide.

Questions About This Pink Tourmaline Rough

How does the dichroism work in this Pink Tourmaline?

This stone shows green when looking across the c-axis and light pink when looking down the c-axis. Orientation is critical to decide which color becomes the primary face-up hue.

What should I watch for regarding pavilion angles in tourmaline?

Tourmaline has a critical angle of about 38 degrees. If the pavilion angles are cut too shallow or near this number, light will leak out the bottom, creating a window.

Is this material prone to chipping during the faceting process?

Tourmaline is brittle and has indistinct cleavage, but it can fracture conchoidally. Using a cool stone and light pressure during grinding helps avoid chips.

Why do some facet edges look doubled in the finished gem?

This is caused by high birefringence, which is the difference between the two refractive indices. It is a common optical characteristic of the tourmaline family.

What causes the pink color in this variety of tourmaline?

The pink coloration in tourmaline is chemically derived from the presence of manganese.

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