◂ BACK TO GEM ENCYCLOPEDIA
Spinel
The Black Prince's Ruby. The Timur Ruby. For centuries, spinel, the great imposter, masqueraded as ruby in Europe's crown jewels.
See Gem As
Tools
Research
Suspended Pargasite Crystal in Pink Spinel
A euhedral prismatic pargasite crystal is identified in pink spinel.
Gem-Quality Spinel from Southern Malawi
Parcels of rough spinel recently mined in Malawi were offered at the AGTA show.
Suspended Crystal in Red Spinel
A crystal inclusion in red spinel displays rainbow colors under fiber-optic lighting.
Large Stellate Dislocation in Spinel
A greenish blue spinel displays a large network of needle-like dislocations clustered in a six-rayed star pattern.
Fissure with Moiré Pattern in Spinel
A precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.
Heliodor with a Large Schorl Inclusion
An 8.33 ct rectangular heliodor displays two tourmaline inclusions and a thin band of fluids.
Color Modification of Spinel by Nickel Diffusion: A New Treatment
Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
Forsterite in a Purple Tanzanian Spinel
Examination of a purple spinel from Tanzania reveals a rare forsterite inclusion.
Color Modification of Spinel by Nickel (Ni) Diffusion: A New Treatment in the Gem Market
GIA researchers report on a new nickel-diffusion treatment used to modify color in spinel and present criteria for identification.
Color Mechanism and Spectroscopic Thermal Variation of Pink Spinel Reportedly from Kuh-i-Lal, Tajikistan
A detailed spectroscopic investigation of the color of pink spinel reportedly from the Kuh-i-Lal deposit in the Pamir Mountains of Tajikistan.
