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Gemstones
Organic Gems Part VI: Coral

Coral has a long history of use in jewellery. Many cultures across the world have valued coral for adornment, and also for its reputed mystical features. As well as being prized for jewellery, red coral was valued as a charm to ward off evil and to increase fertility. It was held to protect against snakebite and reduce fevers. Read more »
Some of the Australian jewellery industry’s most creative opal specialists were rewarded in Lightning Ridge recently.

News
Awards recognise unconventional opal designs

The winners of the International Opal Jewellery Design Awards (IOJDA) have been announced following the prize-giving gala at the Lightning Ridge Opal Festival on 26 July. Read more »

Gemstones
Organic Gems Part V: Jet

Have you heard the term ‘jet black’? It refers to jet, an organic gem material that originates from fossilised trees. Jet from the best-known source, Whitby in North Yorkshire, UK, formed over 180 million years of high-temperature compression under the sea. Jet is a coherent form of carbon with a hardness of 4 on the Mohs scale – hard enough to take a good polish, which makes it a great choice for jewellery. Its technical name is lignite. Read more »

Gemstones
Organic Gems Part IV: Ammolite

Hundreds of millions of years ago, the Earth was very different. Little did the creatures of our planet know, they would not only be a stepping-stone in the evolution of life, but also provide the humans of the future with fabulous jewellery gems in the form of ammolite. Read more »

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 »

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Saturday, 21 September, 2019 02:54pm
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