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Search Results - Gemstones

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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 »
Interpretation of colour is subjective

Gemstones
Colour Investigation: Ruby

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 »
Image courtesy Greg C Grace | Figure 1. Australian argyle pink diamond | Figure 2. Brilliant cut fancy vivid yelow diamond

Gemstones
Colour Investigation: Diamond

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 »


 


Monday, 19 November, 2018 04:15pm
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