Emerald - the symbol of rebirth and bringer of good fortune and youth - is the birthstone for those born in May.
A variety of green beryl, the name emerald is derived from the Greek word smaragdus (green in Greek). The green colour of emerald is caused by traces of chromium, but vanadium may also be present in some stones.
Emeralds can be found in Colombia. Brazil, India, Pakistan, Siberia, South Africa, Zambia and Zimbabwe.
The inclusions contained in almost all natural emeralds are very useful in distinguishing natural emeralds from synthetic emeralds and other green stones. Some inclusions are common for particular localities.
Typical Inclusion and Features
Three-phase inclusions (liquid-filled cavity containing a crystal and a gas bubble)
Two-phase inclusions (liquid-filled cavity containign a gas bubble)
Tremolite (usually fibrous or neddle-like crystals)
Needle-like crystals of actinolite
Mica flakes, pyrite and calcite, and also colour zoning
Combining the typical inclusions found with an assessment of refractive index and specific gravity can give an indication of the country of origin. ■
Guy Lalous ACAM EG summarises the discovery of features that could be used to distinguish between natural and synthetic ametrine from The Journal of Gemmology; from the orientation of growth striations to the interference patterns caused by twinning.
One of the key speakers at this year's Gem-A Conference, Evan Caplan will discuss everything about the extraordinary gemstone, alexandrite including a little history, information on sources (old and new), colour change, cutting, along with some fun stories about his travels and experiences with alexandrite.
The Gemmological Institute of America (GIA) has announced that after 38 years Library and Information Centre Director, Dona Dirlam, has retired, leaving behind a legacy of excellence and a pioneering approach to digitisation of gemmological knowledge.
Columbia Gem House president, Eric Braunwart, explores the growing popularity of American gemstones and discusses the importance of traceability, ethical sourcing and the millennial consumer with Sarah Jordan.
A charismatic duo who have turned their lifelong devotion to natural beauty into not only a solid business but also an expression of art; meet the most intriguing team of two in the world of gems, Vladyslav and Samanta Yavorskyy.