However, not all gold is created equal. Some gold is mixed with alloys, which can be allergenic to some people. Solid gold is best when it is 14k or higher, as it is not easily scratched and will not cause irritation. Also, lower-purity gold is not recommended for body piercings. It is best to avoid wearing gold tongue jewelry because the metal is scratchy and can irritate new piercings. Instead, consider using titanium jewelry instead.