Captcart,
Wow, some questionable advice being offered here! “Showcase” interesting word, what does it mean? Nothing in the gemological lexicon! Emerald cut rubies, almost never seen. Same goes for barion. Most are oval, modified brilliants with Portuguese or step cut pavilions.
If you are looking for a natural unheated stone, a GRS, AGL, Lotus or GIA grading report is necessary. GIA would be my last choice. I’d want one for a heated stone as well. Lot’s of glass filled junk out there. Some stones from the new mines in Mozambique will stand toe to toe with the finest Burmese.
RWW