5.29ct Rubellite Tourmaline rough, table view

5.29ct Rubellite Tourmaline rough, front right view

5.29ct Rubellite Tourmaline rough, back left view

5.29ct Rubellite Tourmaline rough, pavilion view

5.29ct Rubellite Tourmaline rough, back right view

5.29ct Rubellite Tourmaline rough, front left view

5.29CT Rubellite Tourmaline Faceting Rough | Uncut Gemstone

Name: 5.29CT Rubellite Tourmaline Faceting Rough
Brand: Jackson's Gems
SKU: jhomSay_T4Q
Price: 105.80 USD
Availability: InStock

$105.80

Light red 5.29ct rubellite tourmaline rough from Tanzania. Lightly included with dimensions 12.24×10.16×5.91mm. Recommended shape is a pear.

1 in stock

SKU: jhomSay_T4Q Categories: Tourmaline, Rubellite Tourmaline

Technical Specifications & Gemological Properties

Specifications for 5.29CT Rubellite Tourmaline Faceting Rough
Carat Weight	5.29CT
Dimensions	12.24 × 10.16 × 5.91mm
Origin	Tanzania
Treatment	None known
Color	Light Red
Clarity Grade	Lightly Included
Gem family	Tourmaline
Variety	Rubellite Tourmaline
Recommended shapes	Pear
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

Light red tones characterize this 5.29ct rubellite tourmaline rough from Tanzania. This stone is lightly included. A pear is the recommended shape.

Cutting Notes

Orient the table across the c-axis to maintain the lighter red tones, or parallel to it if a deeper saturation is preferred. Use the length of the rough to establish the pear shape. Since the stone is lightly included, keep the preform conservative to evaluate the internal distribution of inclusions before finalizing the girdle.

Rubellite is brittle and sensitive to heat, so keep the stone cool during the grinding process. Avoid applying heavy pressure to prevent fractures. Be aware that the high birefringence of this species can cause facet edges to appear doubled. Keep the pavilion angles above the critical angle of 38 degrees to prevent windowing and light leakage.

Cutter’s tip: Keep your lap cool and use light pressure to avoid chipping the brittle edges of this rubellite.

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

Related Guides

New to cutting Tourmaline? See the Lapidary Guide.

Questions About This Rubellite Tourmaline Rough

How does the c-axis affect the color of rubellite tourmaline?

Rubellite is strongly pleochroic. The color is typically darker when looking down the c-axis and lighter when looking across it.

What is the typical clarity for red tourmaline?

Red tourmaline is generally a Type III gemstone, meaning it is almost always included. Eye-clean pieces are uncommon.

Why is heat management important when cutting tourmaline?

Tourmaline is heat sensitive. Excessive heat during grinding can damage the stone or alter its characteristics.

What causes windowing in a tourmaline facet?

Windowing occurs when the pavilion angles are cut near or below the critical angle of approximately 38 degrees.

Is rubellite tourmaline prone to chipping?

Yes, it is brittle and has a conchoidal fracture, making it susceptible to chipping if heavy pressure is applied.

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