Diamonds

Octahedral face on Buffalo Hills (Alberta) diamond with negative trigons. Photo: A. Banas

SEM image of diamond aggregate from Buffalo Hills (Alberta). Image: A. Banas

Mg-chromite inclusions in octahedral diamond from Akwatia (Ghana). Photo: T. Stachel

Octahedra and octahedral twins (triagular macles) from Diavik (3ct assortment). Photo: A Banas

Star of David style twin. Diamond (~ 3 ct) from Diavik Mine. Photo: A. Banas

Aggregate of cuboid diamond crystals from Diavik. Photo: A. Banas

Polycrystalline diamond aggregate with intergrown red garnet. Photo: A. Banas

Boart from Diavik (the brown material is diamond too). Photo: A. Banas

Coated cuboid diamond from Diavik. Photo: A. Banas

HP-HT synthesis diamonds (yellow cubo-ocahedra) from Element 6. Photo: A. Banas

Ferropericlase inclusion with characteristric peacock colours in lower mantle diamond from Kankan (Guinea). Photo: T. Stachel

gal_diamonds-Ghana_grt

Trigons and hexagons on diamond from Akwatia (Ghana). Photo: T. Stachel

Irregular shaped olivine inclusion in diamond from Akwatia (Ghana). Photo: T. Stachel

Plastic deformation lines on brown dodecahedral diamond from the Cristal occurrence at Wawa (Ontario). Photo: A. Banas

Brown macle (octahedral twin) with distinct graining (brown laminae due to plastic deformation) from the Cristal occurrence at Wawa (Ontario). Photo: T. Stachel

Snap Lake Diamonds

MSc. Thesis Kelsey Graversen (2021)

Numerous small negative trigons and terracing (exhumed growth planes). Photo: Kelsey Graversen

Edge of octahedral face with flat-bottomed trigon and ribbing (exhumed growth layers). Photo: Kelsey Graversen

$Red-orange inclusion of garnet (eclogitic) with associated fracture system. Photo: Kelsey Graversen$

Red-orange inclusion of garnet (eclogitic) with associated fracture system. Photo: Kelsey Graversen

Lineral arrays of negative trigons indicative of plastic deformation. Photo: Kelsey Graversen

$Colourless inclusion (olivine) in diamond with associated fracture system. Photo: Kelsey Graversen$

Colourless inclusion (olivine) in diamond with associated fracture system. Photo: Kelsey Graversen

Green surface spots due to alpha-particle irradiation. Photo: Kelsey Graversen

$"Huge" colorless inclusion (olivine) with associated fracture system in triangular diamond (macle). Photo: Kelsey Graversen$

"Huge" colorless inclusion (olivine) with associated fracture system in triangular diamond (macle). Photo: Kelsey Graversen

Purple Cr-pyrope garnet inclusion (peridotitic suite) in diamond. Small graphite specks on garnet surface. Photo: Kelsey Graversen

Tetragonal etch pits (indicative of {100} plane) on otherwise strongly resorbed diamond surface. Photo: Kelsey Graversen

Purple Cr-pyrope garnet inclusion (peridotitic suite) in diamonds. Imposed cubo-octahedral inclusion morphology. Photo: Kelsey Graversen

$Colorless inclusions (olivine) in diamond with associated fracture systems. Photo: Kelsey Graversen$

Colorless inclusions (olivine) in diamond with associated fracture systems. Photo: Kelsey Graversen

Octahedral diamond with minor ribbing (exhumation of growth planes along edges) and colorless inclusions. Photo: Kelsey Graversen

Resorbed aggregate of two diamond crystals with shield-shaped laminae and ribbing. Purple garnet inclusions. Photo: Kelsey Graversen

Purple Cr-pyrope garnet (peridotitic suite) seen through sharp-edged octahedral face. Photo: Kelsey Graversen

Colourless (olivine) inclusion in diamond. Photo: Kelsey Graversen

$Multiple colourless inclusions (olivine) with minor associated graphite-coated fractures. Seen through shield-shaped octahedral faces with mior ribbing along edges. Photo: Kelsey Graversen$

Multiple colourless inclusions (olivine) with minor associated graphite-coated fractures. Seen through shield-shaped octahedral faces with mior ribbing along edges. Photo: Kelsey Graversen