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Gemstones
Organic Gems Part III: Ivory alternatives

Ivory is a biological gem material used by humans for thousands of years, with early artefacts including carvings and jewellery dating back 32,000 years. However, due to ethical concerns, possession and import of modern elephant ivory harvested after 1975 is an offence in Australia. Read more »

Gemstones
Organic Gems Part II: Pearls

Known as ‘The Queen of Gems’, pearls are our gems of the sea. These lustrous creations have been loved and admired throughout different cultures across thousands of years. This organic gem is produced within the soft tissue of certain species of molluscs and is found in a variety of hues and forms. Read more »

Gemstones
Organic Gems Part 1: Amber

Organic gems are a group of relatively rare and decorative materials that have an animal or plant origin. Amber is fossilised tree resin prized for its rich golden hues. When plant or animal fragments are suspended within the material, they can offer a fascinating peek into our planet’s primordial past. Read more »
Image Left: Citrine | Right: Amethyst

Gemstones
Colour investigation: Quartz

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 »
Left: Aquamarine | Right: Morganite

Gemstones
Colour investigation: Beryl (Part 2)

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 »
Left: Emerald | Right: Goshenite

Gemstones
Colour investigation: Beryl (Part 1)

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 »
Swiss blue Nigerian topaz (left) | Swiss blue topaz (right)

Gemstones
Colour investigation:Topaz

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 »

Gemstones
Amber through the eyes of a Geologist

The gemmological notion of precious and decorative stones also includes amber, which is a mineral regardless of its organic origin. Read more »

Gemstones
Baltic Amber Magic: Know your inclusions

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 »
Image courtesy Greg Grace | Figure 1. Chrome tourmaline | Figure 2. Paraíba

Gemstones
Tourmaline: Indicolite, Verdelite & Paraiba

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 »

Feature Stories
Sapphire Situation: Expedition to Ethiopia's sapphire fields

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 »
Image courtesy Gia Edu | Red tourmaline (Left) | Pink tourmaline (Right)

Gemstones
Colour investigation: Tourmaline - Part I

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 »
Image courtesy Greg C Grace | Pink spinel (Left) | Purple spinel (Right)

Gemstones
Colour Investigation: Spinel

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 »

Gemstones
Colour Investigation: Zircon

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 »
Orange & Blue Sapphires

Gemstones
Colour Investigation: Sapphire

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 »

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Tuesday, 25 June, 2019 11:29pm
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