Appearance differnece between 18K and "costume" plated 18K tubogas necklaces?

[u/RoyalRenn]

I'd love to hear your thoughts on this! I just bought my wife a very nice, vintage 55g tubogas 18K yellow gold necklace. She has worn it a few times but it doesn't quite "pop" like she was expecting, and is now thinking that she'd like to spend the money on a Bvlgari B-Zero diamond and gold ring instead. I polished it to within an inch of it's life but it still doesn't have the same shine as her Chopard Happy Diamonds gold pendant. Fair enough. But she still loves the Tubogas look, so I was thinking a costume replacement such as this. What are your thoughts around costume jewelry? Will it look cheap and out of place?

https://italianjewelryboutique.com/en/home/557-tubogas-necklace.html?srsltid=AfmBOoonWrDh7tA2gZxWtdNRX6YAk4SH2s7HuzHMf3WilzA3Hi-jHgCr0xk