As statement (and signature) pieces go, you could do a lot worse than the look of this sculptural arc of yellow by gold by Ana Khouri.
Offered by Moda Operandi, it is 18k yellow gold; the site notes that the front is hollow. Made in Italy, it has the following dimensions: 5.5″ (14.0cm) x 4.75″ (12.1cm). Choose carefully as the site says it is not eligible for return.
Price is USD$24,000.