Relondar
Dalamus' father's name is Relondar.
Relondar was--and still is--an accomplished gemcutter within Menzoberranzan, and was the one to teach Dalamus his craft.
Relondar was strict in his teachings, and unforgiving of mistakes. Though he did not take any joy in doling out punishments, he had no guilt nor shame about it, either. He viewed it as a necessary teaching tool to keep Dalamus on track, ranging from critique to insults to physical punishment when "correcting" the most egregious failures or flaws.
One of Dalamus' worst mistakes was when he got too heavy handed while using hammer and chisel, damaging the gemstone to the point of there being not enough usable material. He would be sent to his room without dinner. (Nilaufein would sneak him some food.)
If Orgoll stole or damaged or otherwise sabotaged his stock or tools, that, too, was considered Dalamus' fault, for not being more careful and diligent in putting his items away.
Relondar believed it was this harsh teaching method which allowed Dalamus to become so skilled. Even when Dalamus' skills met and exceeded his father's own, Relondar insisted such was just to be expected when having a teacher such as him. Dalamus spent over 150 years striving to be worthy of some praise or encouragement from his father, but Relondar only ever had praise for himself, his son being merely a tool, an extension of himself, to further his own goals and interests of rivaling Merchant clans.