Gem Knowledge

Understanding Boulder Opal

Deep in the Australian outback miners labour tirelessly through tons of rock in the hope of finding a fine source…

Specific Gravity is a vital test that all gemmologists need to be aware of. Here, Gem-A Gemmology Tutor, Dr Juliette…

Jewellery historian and valuer, John Benjamin FGA DGA FIRV, shares insights into the history of topaz gemstones in jewellery, including…

Did you know the colours and patterns in an individual opal gemstone can drastically alter its value and desirability? Here,…

Senior Gemmology Tutor Pat Daly FGA DGA explores the phenomenon of opalisation, how it occurs and where you can expect…

In his third Gemstone Conversations column for Gems&Jewellery, Jewellery Historian and Valuer John Benjamin FGA DGA FIRV explores the fascinating…

Do you know your calcite inclusions from your dumortierite, epidote, fluorite and rutile? Here, Charles Bexfield FGA DGA EG explores…

Iridescence has to be one of the most mesmerising and magical optical effects seen in gemstones. But have you ever…

Locked away in the vaults of Gem-A HQ in London is an assortment of breath-taking treasures that form Gem-A’s Gemstones…