Pink diamonds dazzle in winter
The
Winter 2018 edition of Gems & Gemology (G&G), GIA’s (Gemological
Institute of America) quarterly professional journal, brings together the
beauty and science of gemstones to unveil new discoveries in colored diamonds,
a Russian cultural landmark, corundum, pearls and laboratory-grown diamonds. G&G’s
Winter 2018 issue is available in print by subscription and in the GIA Store,
and digitally – at no cost – on GIA.edu.
Discover
the current science of natural-color diamonds in the lead article,
“Natural-Color Pink, Purple, Red and Brown Diamonds: Band of Many Colors.” GIA
researchers Sally Eaton-Magaña, Troy Ardon, Karen Smit, Christopher Breeding
and James Shigley provide unprecedented gemological and spectroscopic
characterizations drawn from more than 90,000 pink to red diamonds analyzed by
GIA.
Russell
Shor, GIA senior industry analyst, chronicles a Russian landmark in the article
“The History and Reconstruction of the Amber Room.” Read firsthand accounts of
what it was like to reconstruct this eighteenth-century cultural treasure.
The
next article investigates “The Color Origin of Gem Diaspore: Correlation to
Corundum” using trace-element chemistry. In the fourth paper, “Corundum with
Spinel Corona from the Tan Huong-Truc Lau Area in Northern Vietnam,” the
authors explain the genesis of the spinel rim.
GIA’s
Nanthaporn Nilpetploy, Kwanreun Lawanwong and Promlikit Kessrapong follow with
“The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada
maculata.” The study details the internal structures and identifies ways of
separating these goods from pearls of related mollusk species.
G&G’s
final article provides a brief summary and foldout wall chart of diamond
inclusions by GIA’s Nathan Renfro, John Koivula, Jonathan Muyal, Shane McClure,
Kevin Schumacher and James Shigley. The inclusion chart provides a visual guide
to the internal features of natural, laboratory-grown and treated diamonds.
The
issue closes with regularly occurring sections. Lab Notes offers analysis of
three freshwater blister pearls attached to their host shells, De Beers’
Lightbox laboratory-grown diamonds and an exceptionally rare Montana
ruby.G&G’s new Diamonds from the Deep section provides an examination of
how diamonds form in the deep earth. Micro-World serves up an array of internal
features observed in gem materials, while Gem News International reports on
sapphire treated with high pressure and high temperature, coated rough and
faceted synthetic moissanite and gemological conferences around the world.
Winter 2018 Gems & Gemology cover photo
features the 18.96 ct Winston Pink Legacy, a Fancy Vivid pink emerald-cut
diamond that recently sold at auction for more than $50 million. Winston Pink
Legacy courtesy of Harry Winston.
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