As I work my way through the Professional Gemologist course, I find myself asking when a particular lesson or article was last updated. My reason for wanting to know is because of conflicting statements in various reference materials.
A case in point is Unit 2, Lesson 8, HPHT Diamond Update. When was this update current? The lesson refers crystal lattice shift corrections and HPHT:
“Some theories suggest that type IIa diamonds have a stressed growth, atomic lattice shift, caused by volcanic eruption, and that this shift is corrected under HPHT. The Gubelin Gem Lab found this to be false.”
What I’d like to do is be able to look up the Gubelin reference, or at least know when it was published so I can better assess differences in other references. In this particular case, the following not particularly old article from January 2015 (fig 5 “HPHT heals deformations/broken bonds.”):
These statements seem to be in direct conflict, yet I have no way to directly compare them, short of chasing down the Gubelin reference.