Anyone who wants a soft, sparkly pink rather than a flat or matte finish, for either at-home manicures or professional salon use. Because it's part of OPI's layered lacquer system (base coat, colour, top coat) rather than a one-step polish, it suits people comfortable doing a full three-step application. No gel lamp is required, so it also works for anyone without UV/LED equipment at home.

Princesses Rule! gives a wearable pink with enough shimmer to look intentional, staying within OPI's standard 9-free lacquer formula rather than a separate specialty line. Because it's a traditional lacquer rather than a gel, it goes on and comes off without a lamp or soak-off remover, which matters if you're doing your own nails rather than sitting under salon equipment.

• Apply one thin coat of a compatible base coat, leaving a small margin at the cuticle
• Shake the bottle before use so the shimmer pigment mixes evenly and doesn't streak
• Apply two thin coats of colour, capping the free edge of the nail with each coat to help prevent chipping
• Finish with a thin coat of top coat, again capping the free edge
• Allow full drying time before resuming normal hand use

Pros

• Shimmer lays down evenly rather than clumping, so two thin coats give solid colour
• 9-free formula leaves out formaldehyde, toluene, DBP and six other commonly flagged ingredients
• OPI's wide brush covers most nail widths in two strokes

Cons

• The shimmer leans sheer, so most people need two full coats for even opacity, not one
• Needs a compatible base and top coat to reach OPI's 7-day wear claim; worn alone it chips sooner
• No soak-off gel version of this exact shade was confirmed, so LED-cured wear isn't an option here