09/03/2019
• Stacey Lim
From the grandeur of large geodes to the colourful and unusually patterned agate and jasper varieties, quartz is one of the most abundant, widely studied and adored mineral groups, popular amongst gem collectors and jewellers alike. STACEY LIM explores the continuing love and admiration for its coloured crystalline varieties.
Read more »
|
11/02/2019
• Kathryn Wyatt
In our previous issue KATHRYN WYATT introduced the beryl gemstone family and paid attention to its most famous member: the emerald. Here, she examines other varieties, including the aquamarine, morganite, heliodor and goshenite.
Read more »
|
12/11/2018
• Kathryn Wyatt
What do emerald, aquamarine, heliodor and morganite have in common? They are all from the group of gemstones called beryl and are coloured by trace impurities. KATHRYN WYATT reports.
Read more »
|
01/10/2018
• Jennifer Suggett
Topaz has been known as a gemstone for at least 2,000 years. It occurs in a range of colours and has hardness of 8 on the Mohs scale, however it can be brittle. JENNIFER SUGGETT investigates.
Read more »
|
16/08/2018
• Barbara Kosmowska-Ceranowicz
The gemmological notion of precious and decorative stones also includes amber, which is a mineral regardless of its organic origin.
Read more »
View Album
4 Images
|
16/08/2018
• Elzbieta Sontag
Is it possible for amber to fascinate us even more than it already does with its warmth, magic, unique range of hues and natural patterns? The short answer is “yes” according to ELZBIETA SONTAG.
Read more »
View Album
8 Images
|
15/08/2018
• Stacey Lim
While the red hues of rubellite maintain a steady appreciation, the interest and value of blue and green tourmaline was reignited with the discovery of ‘Paraíba’ tourmaline, STACEY LIM reports.
Read more »
View Album
2 Images
|
01/08/2018
At the 2017 Tucson Gem Show, author Andrew Lucas was approached by Ethiopian dealers attending a seminar given by Shane McClure, Global Director, Colored Stone Svc. They proposed to Lucas and McClure to conduct research on Ethiopian gemstone deposits for GIA.
Read more »
View Album
9 Images
|
01/08/2018
• Stacey Lim
Boasting an array of colour and colour combinations unrivalled by any gem species, one can find tourmaline in shades of almost every hue. Throughout history this gem was often confused with other minerals until tourmaline was identified as its own mineral species in the 1800s. STACEY LIM reports.
Read more »
|
04/07/2018
• Stacey Lim
Until recent times, spinel was an underappreciated gem with little consumer recognition. However, as demand for ruby alternatives increase, renewed interest and enthusiasm for spinel grows. STACEY LIM reports.
Read more »
|
13/06/2018
• Stacey Lim
One of the oldest minerals found in the Earth’s crust, zircon has long being used as a substitute for diamonds. STACEY LIM provides some background.
Read more »
|
08/05/2018
• Stacey Lim
Throughout history, sapphire has always been associated with the colour blue. This still rings true today, with many consumers unaware of the other coloured varieties available. STACEY LIM reports.
Read more »
|
29/03/2018
• Stacey Lim
Desire for ruby today is as great as ever. With fluctuating quality and supply, and a high demand for stones over one carat, this blazing beauty can demand the highest price per carat of any coloured gemstone.
Read more »
|
06/03/2018
• Stacey Lim
The diamond industry is built on a foundation of colourless gemstones but vivid-colour varieties are also highly valued and steadily increasing in popularity. STACEY LIM reports.
Read more »
|
08/02/2018
• Stacey Lim
Forming deep within the Earth’s mantle, peridot is no stranger to heat and pressure. This green mineral may also be of extra-terrestrial origin, transported within meteorites from the depths of the universe, impacting the Earth in rare, cataclysmic events. STACEY LIM reports.
Read more »
|