TRAPICHE RUBY

Trapiche Ruby

Trapiche ruby and diamond necklace

Variety: Trapiche Ruby
Species: Corundum
Mohs Hardness: 9 out of 10
Color: Red. (Can be light pink to orangy red to strongly purplish red, but red must be the dominant color.)
RI: 1.762 to 1.770 (+0.009 / -0.005)
Birefringence: 0.008 to 0.010
SR/DR/AGG: DR
Clarity Type: Type II
Optic Character: Uniaxial negative
Pleochroism: Orangy red & slightly purplish red
Spectrum: Fine lines at 659nm, 668nm, 693nm. Broad absorption at 500nm to 610nm.
Fluorescence: Weak to strong red under LW & SW, with best reaction under SW.
SG: 4.00 (+0.10 / -0.05)
Routine Treatments: None
Additional Enhancements: Heating, dyeing

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Trapiche Ruby Facts

Trapiche ruby and diamond necklace

Trapiche rubies are a rare variety of ruby named after a six-spoked cogwheel used in sugar cane mills (trapiche de cańa azucar in Spanish).

Trapiche rubies often have sharp, hexagonal growth lines that create a fixed, 6-ray star.

Trapiche rubies are currently found in only 2 locations on earth: Mong Hsu, Myanmar (Burma) and India.

They're often cut into slices to show off their unique appearance.

Burmese trapiche rubies rarely exceed 1 carat while Indian trapiche rubies can weigh over 70 carats.

Trapiche Ruby Gallery

All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)

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