New vintage minimalist red birthstone pendant necklace (small top facet)

New vintage minimalist red birthstone pendant necklace (small top facet) Quick list Either July Ruby or January Garnet. Hard to tell. But this one has a small top facet. Gold tone hexagon pendant: 4 different textures on front, side, rim, reverse (mold?) plus tiny faux synthetic (I’m assuming) gem Gold tone long medium- thick chain New vintage c. 1970s probably by Artistic Jewellery Canada Pendant: 14 mm hexagon, 3 mm thick, 5 mm bail Chain: 22” long, almost 2 mm wide curb chain Good quality weight and construction. I’m pretty sure it’s costume. Just don’t let it get too wet for long. Note: tiny white mark at top right corner. I think it’s glue or something like that.