Like a lot of companies, IKEA sells things in various tiers. Dressers and bookcases have different price points, and at each price point is a different material quality level.
They however dont make it easy to identify like Kirkland Signature or Lexus.
That's the worst thing about IKEA. They have a great selection of real wood stuff, but finding it is time-consuming in or out of store. Price is the best proxy but that isn't flawless or ideal.
Unbless it's oak, you don't particularly want to have solid wood furniture.
Solid wood is dimensionally unstable and my oak chest of drawers requires special oil treatments to keep cracks from appearing. Plywood or melamine boards are way better for furniture.
Their "real wood" stuff, at least here in Poland, seems to be made from very soft wood, most likely pine (90%+ of forests in Poland are pine). The dark variants (pretending to be exotic wood I guess) are just pine with a dark coloring. When the pine gets nicked, which happens often because it's so soft, its natural color comes out, and sticks out on an otherwise dark furniture like a sore thumb.
The other proble is that sometimes the cheaply built chair is more comfortable and looks better than the solidly built chair… then the right option is to buy neither.
They however dont make it easy to identify like Kirkland Signature or Lexus.