Showing posts with label Lab Notes. Show all posts
Showing posts with label Lab Notes. Show all posts
Monday, February 12, 2024

Rare Natural Bicolor Diamond

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Nature has no rules. Many thanks to Gems & Gemology for sharing the insightful report. Useful link: https://www.gia.edu/gems-gemology/wi...
Tuesday, March 01, 2022

Two Antique Mughal Spectacles With Gemstone Lenses

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Truly unique antique spectacles. Many thanks to GIA New York Lab for sharing the info. Must read. Useful link: https://www.gia.edu/gems-gemo...
Friday, September 24, 2021

Chrysoberyl Inclusions In Flux-Grown Ruby

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Gemologists, gem dealers, consumers beware. Today microscope is not enough. You need LA-ICP-MS and Raman spectroscopy to assist positive gem...
Sunday, April 18, 2021

Unusual Absorption In A Blue Flux-Grown Synthetic Sapphire

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With UV-Vis-NIR spectroscopy, GIA researchers were able to identify the unusual spectrum. It has never been reported in blue lab-grown sapph...

Large Type IIa Diamond From Arkansas, USA

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With FTIR, GIA researchers were able to identify the diamond as type IIa with no measurable nitrogen impurities. Type IIa diamonds are extre...
Sunday, April 11, 2021

Spectral Analysis Of Resin Imitation Ivory

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Without FTIR, Raman spectroscopy, and reference samples, separating ivory from resins would be difficult.  Useful link:   https://www.gia.ed...
Tuesday, February 02, 2021

Dramatic Color Zoning In Alexandrite

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Alexandrite's color looks red in incandescent light and green in fluorescent light or daylight. But gem cutters could modify crown and p...
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Synthetic Moissanite With Fraudulent GIA Inscription

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Buyer beware. If doubtful, always consult a reputed gem testing laboratory like the GIA.  Useful link:   https://www.gia.edu/gems-gemology/f...
Monday, February 01, 2021

A Near-Field-Communication Technology Device Embedded In Bead Cultured Pearls

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Since cultured pearls are opaque, the implementation of such micro-technologies within them is a viable option for a specific function. Anal...
Saturday, January 30, 2021

A New Type Of Rutilated Quartz Composite Product

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Buyer beware. Rutilated quartz refers to natural quartz with rutile needle inclusions. Merchants carve rutilated quartz into spheres rather ...

Novelty Cut Diamond With Remarkable Fire And Ice Fluorescence

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I haven't seen this phenomenon before. The fancy yellowish brown contained a remarkable hydrogen cloud in the blade and cape features in...
Friday, January 29, 2021

Magnetite Inclusions In Star Peridot

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The rectangular needle-like magnetite inclusions are responsible for the four-rayed asterism in star peridot. Take a look. Useful link:  htt...

Black Star Sapphire With Dual Treatments

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In Thailand, glass and dopping varnish is commonly used to treat black star sapphires for variety of reasons. Buyer beware. If in doubt, alw...
Thursday, January 28, 2021

Blue Spodumene

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The main source of gem quality spodumene is Afghanistan; other sources are Pakistan, Brazil, Madagascar, Mozambique, and the United States. ...

Pearl Discovered In Edible Oyster From The Ostreidae Family

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This is the first examination by GIA gemologists of a pearl known to have been produced from the Ostreidae family (true oyster) mollusk, as ...
Thursday, December 03, 2020

Greenish Blue Glass Imitating Gem Silica

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Buyer beware. Useful link:  https://www.gia.edu/gems-gemology/summer-2020-gemnews-greenish-blue-glass-imitating-gem-silica
Friday, November 06, 2020

Unusually Shaped Rutile Crystal Inclusions In Russian Emerald

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GIA Lab Notes. Take a look at the unusual gem inclusions in emerald. Useful link:  https://www.gia.edu/gems-gemology/summer-2020-microworld-...
Thursday, November 05, 2020

Windmills In Rare Mineral Sphalerite

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GIA Lab Notes. Take a look at the propeller-like gem inclusions in Sphalerite. Useful link:   https://www.gia.edu/gems-gemology/summer-2020-...

Trapiche-Like Pattern In An Emerald From Pakistan

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GIA Lab Notes. A wonderful pattern of gem inclusions rarely seen in emeralds. Useful link:  https://www.gia.edu/gems-gemology/summer-2020-mi...
Wednesday, November 04, 2020

Cat’s-Eye Andradite

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GIA Lab Notes. This optical phenomenon is common in many gemstone species, and the demantoid variety of andradite garnet has been known to d...