Modified Rheinberg Illumination
A lighting method modified for gemological microscopy provides false-color contrast to enhance inclusion scenes.
Blue Gahnite Inclusions inCat’s-Eye Heliodor
Blue octahedral crystal inclusions within heliodor cabochons are found to be gahnite, a zinc-rich end member of the spinel group.
Pezzottaite Debuts as the Newest Trapiche Gem Mineral (英語)
A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.
Rough Diamond Fragment with a Large Green Cleavage Surface
A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.
Cleavage System in Pink Diamond
A Fancy Intense purplish pink diamond with a network of planar cracks and strain-induced bodycolor reveals an aesthetic geometric pattern.
Molybdenite in Topaz
An unusual host-inclusion association is revealed when a cluster of crystals in a colorless topaz is discovered to be molybdenite.
Glassy Melt Inclusions in Sapphires from Montana
Two-phase inclusions are investigated in alluvial sapphires from deposits in Montana.