Tiara

Almost every Sailor Guardian wears a tiara as part of her uniform. Three figures skip it entirely: Eternal Sailor Moon, plus the manga versions of Sailor Galaxia and Sailor Cosmos. From a few steps back the ornament reads as a plain, glossy gold curve holding one round red stone at the middle. Move nearer and finer engraving shows across its face, with the jewel cradled inside a slim gold mount. Usagi first gains the piece the moment her basic Sailor Moon form appears.

For Sailor Moon the accessory doubles as her opening offensive tool. Within the anime she pulls it off her forehead to trigger Moon Tiara Action, sending it spinning at a foe the way one throws a flying disc, and Moon Tiara Stardust follows, sprinkling curative dust over youngsters held under enemy control. Manga and Crystal hand her a different pair of moves: Moon Frisbee, which the reprint later titles Moon Tiara Boomerang, and the print-exclusive Moon Twilight Flash, where a sharp glare bursts out of the central gem. As she readies the throw the band flattens into a ring with the stone perched above, and a short chain ending in a little crescent dangles off one edge purely for looks. The weapon gained enhancements through the Dark Kingdom storyline yet kept its shape everywhere else.

Headgear like this sits on nearly all the Guardians, though only two, Sailor Moon and Sailor Jupiter, turn theirs into weapons, Jupiter drawing a lightning rod out of hers to fuel Supreme Thunder. A stone's tint normally mirrors its wearer's theme color, with Sailor Saturn the outlier, since her gem stayed white against a purple motif. Across manga and Crystal, Moon's band breaks apart in the clash with Jadeite during Act 3, comes back more elaborate in Act 4, then bends into a crescent, a quiet hint at her true role as Princess Serenity. Once the nine Super Guardians climb to their Eternal ranks, star shapes replace the jewels in their tiaras, though Eternal Sailor Moon carries none, wearing only a crescent moon.