Look at the bottle the rose hip oil came in. It should be blue or brown glass, not clear, to limit the amount of direct light reaching the oil, which can make the quality deteriorate faster or turn the oil rancid.
Read the label closely for clues. Try to determine where the oil was produced and look for any "organic" statements. You may find certified organic labeling or a statement on the label that the product is expeller- or cold-pressed. The ingredients should list 100 percent cold-pressed rose hip oil. If you see chemicals or additives, then the oil is probably not cold-pressed.
Check the directions on how to use and store the rose hip oil. If the directions say an opened bottle will last for more than 90 days, then the manufacturer used chemicals or preservatives, and it may not be genuine cold-pressed rose hip oil.
Open the bottle and take a whiff. The oil should have a distinct odor but not a sweet rose fragrance. If you smell roses, the manufacturer added fragrance, and the oil probably is not genuine rose hip oil.
Place some of the oil on a white surface and look at the color. Rose hip oil is naturally a reddish hue, although a cold-pressed oil can be strained or refined into a clear oil. If the oil has a reddish color, it is more likely to be cold-pressed.
Contact the manufacturer to ask questions about the oil or to clarify any of the statements on the label. The label may provide contact information such as a phone number or website for consumers.