red corundum known for vivid pigeon-blood color, 9 Mohs hardness, and dramatic matrix on marble or zoisite; prized for rarity and notable localities.
Regional guide
Ruby from Luc Yen, Vietnam
Luc Yen ruby, Vietnam — marble-hosted pink-red to purplish corundum in white marble, famed for crystal form, luster, and matrix prized by collectors.
Locality guide
Luc Yen Mine
Luc Yen Mine, Vietnam — a gem locality producing ruby, spinel, pargasite and tourmaline in marble, known for vivid color contrasts and cobalt-blue spinel.
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