While color separation is one sign of age, Wang says it's important to look for other changes in a nail polish's color and texture. If the hue has changed since you bought it or it looks thick and gloopy, it's likely past its prime. Another huge red flag is odor, adds Berry.

OPI GelColor: The label itself should be very well stuck onto the base if you can remove this label easily be wary. Fake bottles seem to be slightly shorter when compared to genuine bottles. Genuine bottles have a finely ribbed base. Many fakes have no ribbed base or the ribbed texture is chunkier (see above photo)

Looking at the nail polish names when I'm picking out a color. Suzi Weiss-Fischmann agrees—and she should know. As the co-founder of O.P.I., the ubiquitous nail polish brand known for its tongue-in-cheek color names, those nail shades called I'm Sooo Swamped! and Teal the Cows Come Home are all her.

OPI is a leader in nail polish brands. It's more expensive than other brands because of the quality of the polish. I like OPI polishes however, my go to brand of nail polishes is Zoya. You get what you pay for and I believe OPI is one of the best nail polishes that's comapred to China Glaze and Essie.