Tag Archives: weldon of dublin


Emerald is one of the earliest known coloured gemstones, having been prized since antiquity. Its name comes from the Greek word “Smaragdus” which means green. The earliest known emerald mines were in Egypt, about 3000BC, from a location near the Red Sea that would later be known as “Cleopatra’s mines”. Cleopatra was known to have […]

The Hastings Diamond

The Hastings Diamond is a large Golconda diamond, weighing 101 carats. It was named after the British Governor general of India, Warren Hastings. It was given to King George III in 1785, the gift of Nizam Ali Khan, the ruler of Hyderabad. Hastings was at the time on trial in London for what were rather […]

Glossary of Jewellery Terms

Here is a few of the terms that jewellers and gemmologists use, and their meanings: A jour: a type of setting which allows light to enter the pavilion of a faceted stone Adularescence: The appearance of a floaty, billowy light in cabochon gemstones, or a stationary sheen on the flat surface of a stone Ajour√©: […]

Diamond type system

With the advent of high tech spectroscopic equipment, more and more testing is done on diamonds. One recent branch of diamond study is the notion of “type” of diamond. What is diamond type? Diamond type refers to the make-up of the diamond crystal; pure diamond is 100% carbon atoms, arranged in a very regular, repeating […]

Diamond identification

Sometimes we get asked by a customer if the stone that they found tucked at the bottom of their jewellery box is a real diamond or not. One very quick way to rule out many fakes is to try the newspaper test. Diamonds are highly dispersive, and have a high refractive index. This means that […]