@QuiltE They would be both if the frames themselves are labeled "titanium". Titanium metal frames with TiN coating to make them gold colored. TiN should be hypoallergenic as well, and is much more durable than gold plating for those who prefer the gold color.
If a sewing needle or rotary blade is labeled "titanium", but has a gold colored tip on the needle or the blade itself is gold colored, the underlying metal is some form of steel and the gold color is a TiN coating.
(I used to work with equipment that did physical and chemical vapor deposition, and thought it was cool to learn about Ti-nitride's various uses.)