「HAPPY BIRTHDAY」は FontVibe AI で作成したクリスタルの文字エフェクトです。純粋な宝石クリスタルから削り出した、ダイヤモンドカットのファセット面。鮮やかな虹色のプリズム分光と高級感あふれる輝きが特徴です。下面には集光模様が映し出されます。

carved from flawless gemstone crystal — each letterform cut with precision faceted geometry following brilliant-cut and emerald-cut diamond principles. Table facet, crown facets, girdle edge, pavilion facets all precisely rendered. Optically pure material: Brilliance (white light return), Fire (rainbow spectral dispersion), Scintillation (extreme facet contrast sparkle). Internal caustic corridors visible. Six-point sparkle flares at letter apexes. Maximum optical drama — every letter a dazzling cut precious gemstone. A celebratory luxury birthday-card image, square composition, with the exact words “HAPPY BIRTHDAY” as the only lettering. Arrange them on two centered lines, HAPPY above BIRTHDAY, with BIRTHDAY larger and leading; keep every letter fully visible and clearly legible. Let the crystal words occupy most of the frame, floating in a deep midnight-navy vault of darkness. A hard overhead pinpoint spotlight ignites the table facets near-white, while pavilion facets fall into rich blue-violet shadow. Sharp six-point sparkle flares crown the letter apexes, and fine prismatic rainbow fire beams radiate outward from selected facets. Internal caustic corridors shimmer within the gemstone forms, casting delicate spectral glints onto the surrounding darkness. Frame the lettering with a sparse, elegant halo of tiny suspended crystal fragments and restrained pinprick lights, leaving generous negative space around the words. The effect is festive but refined, like a one-of-a-kind jewel presented for a special occasion; keep the lettering as the unmistakable focal point, with no cake, candles, extra symbols, or additional text.