Emerald rough green

Rough green emerald: intense green hexagonal crystal, one of the most valuable beryl varieties, mined primarily in Brazil, Colombia, and Zambia.

About this subject

Emerald is a variety of the mineral beryl (Be3Al2(SiO3)6), with its characteristic green color caused by trace amounts of chromium and vanadium in the crystal structure. Unlike other gemstones, natural emeralds almost always contain internal inclusions and fractures, called 'jardin' (garden), which lapidaries consider part of their identity. Hardness on the Mohs scale is 7.5 to 8, making them relatively durable but brittle due to inclusions.

Major emerald deposits are in Colombia (Muzo, Chivor, and Coscuez mines), which produces about 70% of the world's high-quality gems. In Brazil, the states of Minas Gerais, Bahia, and Goiás yield lighter, more yellowish emeralds, while Zambia provides darker, more saturated green crystals. Artisanal mining still prevails in many deposits, with techniques ranging from hand panning to mechanized operations.

Culturally, emerald has been associated with royalty and healing since ancient times. Ancient Egyptians worked mines in the Eastern Desert, while the Incas and Aztecs valued the gem as a symbol of fertility and power. In the Middle Ages, emeralds were believed to cure eye diseases and protect against spells. Today, emerald is the birthstone for May and the national gemstone of Colombia.

Rough emeralds are traded per carat, with prices varying drastically by color, clarity, size, and origin. Well-formed crystals with intense color can fetch over US$50,000 per carat at auction. Identification of synthetic or treated emeralds (e.g., oil or resin impregnation) is performed by gemologists using microscopy and spectroscopy.

Frequently Asked Questions

How to tell a real emerald from a fake?

Real emeralds almost always have inclusions visible to the naked eye or under a loupe. Color is uniform but not artificially perfect. Gemological tests like refractometer and spectroscope confirm authenticity.

Where can rough emerald be found in Brazil?

Main deposits are in Minas Gerais (Itabira, Nova Era), Bahia (Campo Formoso, Pindobaçu), and Goiás (Santa Terezinha de Goiás). Extraction is predominantly artisanal.

What is the cultural significance of emerald?

Emerald is considered the stone of unconditional love and wisdom. In astrology, it is associated with Taurus and believed to bring emotional balance and prosperity.