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. ■
First published in the Spring 2018 issue of Gems&Jewellery, Christa Van Eerde MA MLitt DGA FGA explores the history of some of the world’s most magnificent pearls sourced in the Gulf region, including Bahrain, Kuwait and the UAE, famously regarded as the historic heart of the pearling world.
From Gems&Jewellery Spring 2018, Gem-A assistant tutor, Beth West FGA DGA, explores the remarkably epic journey of diamonds, and how their characteristic strength is rooted in their archaic origins and resilient survival.
Collectors, gem experts and jewellery lovers were buzzing with excitement in Geneva on May 15 when a whole host of incredible items hit the auction block. The three most prominent pieces – the Farnese Blue diamond and two 50 carat diamonds – soared far above their estimates to secure eye-watering prices.
Guy Lalous ACAM EG is on-hand to summarise some of the more in-depth articles from Gem-A's The Journal of Gemmology. Here, he explores an article on radiocarbon age dating of natural pearls from the Winter 2017 issue.
With blue diamonds smashing auction world records in the last two weeks, and the eagerly anticipated auctions of a phenomenal Kashmir sapphire and the Farnese blue diamond on the horizon, Gem-A explores the latest fascination with blue – the traditional colour of trust and loyalty.
With 2018 being the Year of European Cultural Heritage, Gem-A is excited to share Sarah Steele's important collaborative project between England and Spain to preserve and maintain traditional jet workings, which has recently been granted the European Heritage Seal.