「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. Create a polished square birthday greeting, with the exact words “HAPPY BIRTHDAY” as the sole lettering. Arrange them on two centered lines, HAPPY above BIRTHDAY, with generous spacing and a clear, celebratory hierarchy; make BIRTHDAY the larger line. Let the carved gemstone words float prominently in a deep midnight navy-to-black setting, like a jewel revealed inside a private vault. A crisp overhead pinpoint light sends near-white brilliance across the upper facets while lower planes fall into saturated blue-violet shadow. Sharp six-point star flares glint at selected corners, and fine spectral beams of red, gold, green, and violet radiate from the brightest crown facets. Subtle caustic light corridors glow within and just behind the lettering, adding depth without obscuring any words. Frame the composition with a restrained halo of tiny distant crystal glints, sparse enough to preserve the dark negative space and keep attention on the greeting. The result feels like an extravagant, precious birthday wish: immaculate, luminous, celebratory, and instantly legible, with no additional text, numbers, candles, or competing focal points.