Octahedron 2.2

B. Octahedron. The predominant habit of gem quality rough is the octahedral shape or a modicication thereof. In photo 2.2 we can recognize a shape that has eight triangular surfaces and six points of which faces and points are connected and bordered by twelve ribs. The octahedron can at times be very symmetrically formed in which it can be referred to as a glassy. Another way to view the basic octahedron is that of two pyramids glued at their base. This shape produces the maximum weight retention when manufacturing round brilliants.

 

4.2

Photo 4.2 shows several carbon inclusions close to the surface of this rough diamond.

4.3

Photo 4.3 displays carbon inclusions grouped together in an irregular shape rough.