Trapiche Ruby

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Photo courtesy of Scott Papper, GIA GG, AJP, Global Gemology & Appraisals

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)

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Trapiche Ruby Facts

Photo courtesy of Encyclopedia of Crystal

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