Diamond World (DW) May - June 2020

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GIA AdvertorIAl Stone Talk Ruby Rarity, beauty and an incomparable red colour make ruby one of the most important gems in the coloured stone market. Because of these attributes, ruby was called the “king of gems” in ancient India. Today ruby can command the highest per-carat price of any coloured stone. Ruby is a variety of the mineral corundum. In its purest form, the mineral corundum is colourless. Trace elements that become part of the mineral’s crystal structure cause variations in its colour. Chromium is the trace element that causes ruby’s red. The more chromium that is present in the gemstone, the stronger the colour. The word “ruby” comes from the Latin “ruber,” meaning red. Ancient Hindus believed that offering fine rubies to the god Krishna assured rebirth as emperors. Burmese warriors thought it made them invincible in battle. Medieval Europeans maintained that rubies bestowed health, wisdom, wealth and success in love. Colour Colour is the most significant factor in determining a ruby’s value. Ruby ranges from a saturated red, to dark red and orangey red, to purplish red. Desirable rubies include pure, vibrant reds to slightly purplish reds. The most sought-after colour by collectors worldwide is a deep red sometimes tinged with a hint of purple. In the trade, such rubies are occasionally referred to as “pigeon’s blood,” because of their deep, unmistakable colour. ©2018 GIA. GIA® is a registered trademark of Gemological Institute of America, Inc. 112 | may-june <strong>2020</strong> | DiamonD WorlD ADT180075_Ruby_advertorial_India_v5.indd All Pages
GIA AdvertorIAl Clarity A ruby’s value can be significantly reduced if inclusions, or clarity characteristics, affect its transparency or brilliance. However, some natural inclusions can be expected and they remain as beautiful markers of the gemstone’s origin. Inclusion-free ruby is practically nonexistent, so value fluctuates depending on how visible the inclusions are. Inclusions can also affect a ruby’s durability, especially if there is a surface-reaching fracture. Typical clarity characteristics include thin mineral inclusions called needles. Rutile needles, or “silk,” can contribute positively to a gem’s appearance. Sources The most famous ruby mines are in Myanmar (formerly known as Burma). Vietnam, Mozambique, Madagascar, Kenya, Tajikistan, Afghanistan and Pakistan are also sources of ruby. The most renowned rubies, like those from Myanmar, the Himalayas, and northern Vietnam, typically form in marble. In other locations, rubies can be found in basalt rocks. Rubies from these sources can have higher iron content, which can make the rubies darker and less intense in colour. Treatments Heat treatment is often used to improve the colour or clarity of a ruby. Heat can also cause some fractures to “heal” in certain conditions. Lower quality material may have surface-reaching fractures that are filled with a glass and repolished. This treatment is designed to decrease the visibility of the fractures. All treatments should be disclosed to the buyer. To learn more about rubies and other popular gemstones visit GIA.edu/gem-encyclopedia This article is provided by GIA (Gemological Institute of America). GIA.edu This article is provided by GIA (Gemological Institute of America). Images Courtesy of: Bear Essentials, Bill Larson, Christie’s GIA.edu Learn More About GIA Education Programmes and Laboratory Services in India GIAindia.in Email: labindia@gia.edu Email: eduindia@gia.edu Images Courtesy of: Bear Essentials, Bill Larson, Christie’s Learn More About GIA Education Programmes and Laboratory Services in India GIAindia.in Email: labindia@gia.edu Email: eduindia@gia.edu DiamonD WorlD | may-june <strong>2020</strong> | 113 7/25/18 12:57 PM
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FOunDER: Late Vidya Vinod Kala Alok
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editorial Sparkle of Hope No pandem
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RoUGh & MininG Rough prices of Petr
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Round & About POLISHED DIAMONDS 3ct
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Lab & TechnoLogy Round & About GIA
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Round & About AssociAtion & trAde B
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Round & About Retail and ecommeRce
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In MeMorIaM He was born in Patan, G
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In MeMorIaM Arunbhai with De Beers
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In MeMorIaM A Saga of Successes A t
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In MeMorIaM Remembering a Gentleman
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In MeMorIaM Life & Times of Arunbha
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In MeMorIaM Antwerp diamond market
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In MeMorIaM With late Shri Mafatlal
Page 69 and 70: Cover Story The very first day Mumb
Page 71 and 72: Cover Story The Carpe Diem mentalit
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Page 84 and 85: SPECIAL REPORT Ban on rough diamond
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Page 91 and 92: SPECIAL REPORT Earrings, Oriental G
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Page 96 and 97: Special Feature Cartier Gem-Set, Di
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Page 103 and 104: The Rock Talk Roman Barocco necklac
Page 106 and 107: DW Promotion Limelight Lab-Grown Di
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Page 110 and 111: Design stuDio Selim Mouzannar Beare
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Diamond World (DW) May - June 2020

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