Happy Anniversary! is for someone who wants a dense, sparkly silver rather than a subtle sheer shimmer — think celebrations, special occasions, or anyone who likes a glitter finish without the gritty texture of a chunky glitter polish.

Because it's a standard Nail Lacquer rather than a long-wear formula, it suits people who don't mind touching up within a week, and it's equally easy to apply at home or have done at a salon.

This shade earns its place for the specific effect: dense metallic silver glitter that reads as sparkly rather than sheer, distinct from shimmer polishes that just add a soft sheen over a base color.

It works as a reliable go-to for celebrations, holidays, or any occasion where a plain solid color would feel too flat, without requiring the extra primer-and-topcoat routine of OPI's long-wear line.

Happy Anniversary! uses OPI's standard three-step Nail Lacquer application:

• Apply one coat of OPI Natural Nail Base Coat.
• Apply two thin coats of Happy Anniversary!, capping the free edge of each nail.
• Finish with one coat of OPI Top Coat for shine and durability.
• OPI's DripDry Lacquer Drying Drops can be used afterward to speed up drying, though they aren't required.

• Pro: Fine, dense glitter builds to full coverage in two coats rather than needing a heavy third layer.
• Pro: Silver glitter finish hides small application mistakes far better than a solid color would.
• Con: As a standard Nail Lacquer rather than Infinite Shine, expect roughly a week of wear rather than OPI's extended long-wear claims.
• Con: Glitter-finish polishes are generally more work to remove fully than a crème, often needing a foil-wrap or soak method to clear glitter from cuticles and skin.