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| Basic Identification Features of Heat Treated Corundums. | [ 18 Jul 2011 - 07:18:01 AM ] |
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Basic Identification Features of Heat Treated Corundums.
Ajith Siriwardena Msc.(Gemmology), B.com(special),Dip in Marketing, ANPAS, MGA,IGI,FGA Pictures By Dayananda Dillumuni FGG (Ger), FGA (Lon) ,MGA(SL) In the world of precious stones various types of treatment methods are applied to improve the beauty and the value of the gemstones. Picture -Tesion discs in heted coundum |
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| Beryllium - | [ 18 Jul 2011 - 07:17:06 AM ] |
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Beryllium treated stone set jewellery Artical by Sheriff Abdul Rahuman Gemmologist Photo Ajith Siriwardena The most vexing problem ever faced by the coloured gem stone trade is without doubt the beryllium diffusion of corundum.The problems that came with the advent of synthetic gems around the turn of the nineteenth century was soon overcome with comparative ease with the equipment available even then in a modestly equipped laboratory. Even the more advanced synthetics that hit the market like the Kashans, Chathams, Inamoris, Knishkas, Lechleitners,Czochralski etc. could be easily identified by a diligent gemmlogist with a good microscope. |
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| Jewels 2010 Gemmological Exhibition and Competition, | [ 24 Nov 2010 - 02:26:42 AM ] |
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Open Competition to ALL Sri Lankans…
Sri Lankan Gem, Mineral & Jewellery Exhibition & Trade show organized by the National Gem & Jewellery Authority (N.G.J.A) in collaboration with the Gemmologists Association of Sri Lanka (GASL) will be held on 10th, 11th and 12th December 2010 at the BMICH HALL B.
Best Sri Lankan articles to be selected from following categories;
• The best Natural Crystal.
Fine Natural crystal of high Gemmological interest.
• Lapidary Art - Best Fashioned Gemstone.
Facetted Cabochon or Carved.
• The best Gem studded Jewellery.
• The best Gemmological photograph
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| Tragedy of Calibrated Gemstone Industry in Sri Lanka. | [ 03 Nov 2009 - 04:53:10 AM ] |
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Tragedy of Calibrated Gemstone Industry in Sri Lanka.
Geetha Gunathilake FGA , MGA
Introduction.
What is a calibrated gemstone? A gemstone cut into a particular shape and size is known as calibrated gemstone. There are internationally recognized shapes such as Rounds, Ovals, Pear, Marquise, Square, Rectangular, |
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| Knowledge and Education - Diploma in Gemmology from a countr | [ 03 Nov 2009 - 04:42:50 AM ] |
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Knowledge and Education - Diploma in Gemmology from a country of Gems.
Ajith Siriwardena
President,GASL
B.Com(special) ,Msc.(Gemmology), FGA, IGI,
Therefore in the Examination of Diploma in Gemmolgy conducted by the Gemmologists Association of Sri Lanka covers the following subject areas such as scientific and theoretical knowledge of gems and practical aspects related to Gem Identification, Mining, Colour Enhancements and Value Addition, Fashioning, Marketing and Economic aspects of the industry. |
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| Synthetics, are they really gems? | [ 03 Nov 2009 - 04:39:24 AM ] |
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Synthetics, are they really gems?
Professor P.G.R.Dharmaratne Phd,FGA,D Gem
Photo by Ajith Siriwardena
This is a question very often, a layman will ask you. Let us look at what we call gems. Any substance which has some special properties is called a gem. Colour, clarity or cleanness, transparency (In some materials lack of transparency, i.e translucency or opaqueness) or durability are the properties which make a substance a gem.
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| Picture of the month | [ 16 Aug 2008 - 09:38:13 AM ] |
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Photo and text by Dayananda Dillimuni, Consultant Gemmologist, FGA; FGG Mineral inclusions of goethite and lepidocrocite are found in quartz varieties of rock crystal and amethyst. Goethite is the hydrated iron ore FeOOH in black colour needle form and lepiocrocite is of the same composition in tabular modification. Ruby mica is a term given to lepidocrocite due to its strong red colour. |
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| I want ….. which stone will bring me luck…??!! | [ 16 Aug 2008 - 09:37:18 AM ] |
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Rosemary Dharmaratne,MGA,FGA Picture by Ajith Siriwardena The ancients believed what we in our present day believe too and it is not unhealthy to support that they took many of these ideas as ‘old wives tales’. many of these old wives are dead and you keep harking back to the old wives tales. Certainly there has been many technical advances in the 20th and 21st centuries. |
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| Picture of the Month | [ 02 Jul 2008 - 03:24:51 AM ] |
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| “Sun spangles”, |
Picture and description by Dayananda Dillimuni, FGA, FGG. Specimen by Najeema Aboosalih t“Sun spangles”, he familiar term used to describe the characteristic figure of stress crack produced in heat treated amber. |
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| Picture of the month | [ 12 May 2008 - 08:06:41 PM ] |
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Piccture and discription by Dayananda Dillimuni, FGA, DGG.
Consultant Gemmologist
Not a Butterfly wing or Lizard skin. These ultra thin cavities are parallel to the basal plane in aquamarine displaying a colourful mosaic pattern... |
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