Spinel
The Black Prince’s Ruby. The Timur Ruby. For centuries, spinel, the great imposter, masqueraded as ruby in Europe’s crown jewels.
A crystal inclusion in red spinel displays rainbow colors under fiber-optic lighting.
Read MoreA greenish blue spinel displays a large network of needle-like dislocations clustered in a six-rayed star pattern.
Read MoreA precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.
Read MoreAn 8.33 ct rectangular heliodor displays two tourmaline inclusions and a thin band of fluids.
Read MoreReports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
Read MoreExamination of a purple spinel from Tanzania reveals a rare forsterite inclusion.
Read MoreGIA researchers report on a new nickel-diffusion treatment used to modify color in spinel and present criteria for identification.
Read MoreCobalt is identified as the primary coloring agent in an intense blue specimen of gahnospinel at GIA’s Bangkok laboratory.
Read MoreA detailed spectroscopic investigation of the color of pink spinel reportedly from the Kuh-i-Lal deposit in the Pamir Mountains of Tajikistan.
Read MoreRed spinel from Vietnam features iridescent needles resembling a futuristic skyline.
Read More