First thing that came to my mind when I saw the golden beetle was this short anecdot from C. G. Jung :
"A young woman I was treating had, at a critical moment, a dream in which she was given a golden scarab. While she was telling me this dream, I sat with my back to the closed window. Suddenly I heard a noise behind me, like a gentle tapping. I turned round and saw a flying insect knocking against the window-pane from the outside. I opened the window and caught the creature in the air as it flew in. It was the nearest analogy to a golden scarab one finds in our latitudes, a scarabaeid beetle, the common rose-chafer (Cetonia aurata), which, contrary to its usual habits had evidently felt the urge to get into a dark room at this particular moment. I must admit that nothing like it ever happened to me before or since."
The Ace of pentacles is for me a card of great potential. You have the choice to "cultivate your garden" (the friendship) or go through the arch to new horizons. Nothing is done or set in stone : you have the tools in your hands, the choice is yours. What I find amusing is that the scarab in Egypt refer to the ancient god Kheprer who "roll" the sun along the sky and in this card, the beetle seems to have roll the coin out of the hand, not across the sky but across the garden. What a beautiful image for friendship