New vintage minimalist March aquamarine birthstone pendant necklace

New vintage minimalist March aquamarine birthstone pendant necklace Quick list Blue green colour makes me guess it’s aquamarine 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. These birthstones are so confusing so please take a good look at all of the types I have available. I think the bright blues are September Sapphires. The ice blue is December blue zircon. The sort of green blue is March aquamarine.