Quench-Crackled Dyed Blue Chalcedony Resembling Larimar
Raman spectroscopy confirms sea-blue beads with a similar appearance to Larimar are actually quench-crackled chalcedony.
Multiple Radiation Stains Suggest Interesting Geological Residency
A rough diamond crystal weighing 4.05 ct was observed with radiation staining on its surface.
Negative Crystal Containing a Mobile CO2 Bubble in Blue Sapphire Heated with Pressure
A carbon dioxide bubble enclosed within a negative crystal in a pressure-heated blue sapphire moves when gently heated.
Cat’s-Eye Andradite
Fine needle inclusions create a striking cat’s-eye effect in a rare brownish yellow andradite garnet.
Exceptional Purple Montana Sapphire
A particularly fine unheated purple Montana sapphire is noted for both its size and its multiple diverse inclusions.
Hemimorphite Resembling Paraíba Tourmaline
Copper in the zinc silicate known as hemimorphite creates an electric blue color similar to that of Paraíba tourmaline.
Irradiated Blue Diamond with Interesting DiamondView Image
DiamondView image of an irradiated blue diamond reveals unusual gemological features due to a combination of treatments.
HPHT Laboratory-Grown Pink Diamond with Unstable Color
A lab-grown diamond with an equivalent color grade to Fancy Vivid pink demonstrates a temporary color change under short-wave UV radiation.
Pink Mozambique Sapphire
Examination and testing of a beautiful large pink sapphire establishes its lack of treatment and its origin in Mozambique.
HPHT-Processed CVD Laboratory-Grown Diamonds with Low Color Grades
The Antwerp lab examines CVD laboratory-grown diamonds where HPHT processing resulted in relatively low color grades.