OUR PUBLICATIONS
LEAD GLASS TRAPICHE RUBIES
Since 2004, treating corundum (primarily rubies) by filling fractures with lead glass has continued to develop.
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Dernières connaissances en matière de luminescence des gemmes
Gems & Gemology, Vol 47, n°2, Summer 2011
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Pinctada Margaritifera Cultured Pearl with Baroque-Shaped Nucleus
G & G January 10, 2013 Volume 4, No. 4
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SYNTHETIC CORUNDUM SCULPTED TO IMITATE NATURAL CORUNDUM
Those who frequently travel to gem deposits to buy rough stones quickly come to understand that a sword of Damocles hangs over them...
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A “SECRET OPTICAL JEWEL” UNDER STUDY AT THE LFG PHOTO-MICROSCOPIC JEWEL BY RENÉ DAGRON
The French Gemmology Laboratory recently had the opportunity to analyse an exceptional jewel.
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DIAMONDVIEW™, CONCEPT AND USE AT LFG
The French Gemmology Laboratory has been equipped with a latest-generation DiamondView since 2006.
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The Santa Maria variety of aquamarine : never heated
In Color, All about Colored Gemstones, Summer 2013, n° 23
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YELLOW-BROWN SYNTHETIC DIAMONDS FOUND IN “MIXED” DIAMOND BATCHES
The French Gemmology Laboratory (LFG) has just analysed several thousand yellow-brown diamonds commercially referred to as “cognac” diamonds...
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AN EXTRAORDINARY DOUBLET MOUNTED ON A FINE JEWELLERY RING
The LFG recently had the opportunity to study a white gold ring, decorated with an oval green stone...
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FIRST SYNTHETIC DIAMONDS BROUGHT TO LFG
Synthetic diamonds have been the subject of numerous studies since they were first created in the 1950s.
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AN EXCEPTIONAL PEZZOTTAITE AT THE LFG
Pezzottaite is a relatively new mineral, discovered in 2002 in Madagascar...
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AN UNUSUAL FILLED RUBY, LIKELY OILED
A 12.12 ct rectangular red stone with cut edges (Figure 1) was submitted to the LFG.
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CONTACT US :
contact@lfg.paris
(+33) 01 40 26 25 45
30, rue de la Victoire - 75009 Paris
Monday - Thusday : 9H30 to 17H00
Friday : 9h30 to 16h30
Withdrawal files at same days and time
