Not to jump in on your quetion for Mara, but I'm insane today, so I will just the same... pscope stands for "pricescope". If you look on your screen you'll see a link at the top left next to "tutorial". That link takes you to a search engine where you can put in the size and characteristics of the diamond you are looking for and it will locate it at various merchants...
Michael
Not sure what will pop first... the question... or, my brain...