A group of three Diamond crystals, each with a slightly different color hue and very different crystal habits. From an old collection, these total 1.55 Carats. The largest crystal is a penetration twin cube the middle size is a cube with half of its faces having hopped indents and half with growth hillocks and the thirst seems like a cyclic discoidal twin. Under magnification many small modifications and extra faces are seen. Sharp and a nice suite of Carbon!
A big, (4.5 CT) complex Diamond crystal with a fine glassy, vitreous luster. An older specimen, vintage 1980's that presents well and shows some very intricate crystal modifications. Also note there is a distinct color shift from yellow to a green or brown green hue in different light sources. A very good crystallized example of the element (Carbon) that humans are made from!