New vintage minimalist December blue zircon birthstone pendant necklace

New vintage minimalist December blue zircon birthstone pendant necklace Quick list 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 Measurements soon 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.