So I tried the prompt with DALL-E 3. That algorithm is better at making things that have branches that look like the Mandelbrot fractals everybody's familiar with, but it's still not a Koch curve. And it doesn't even have the six-sided symmetry of a snowflake.
Sacred geometry, Koch snowflake, meticulously detailed, intricate, with strongly contrasting colours. A bright, clear palette of blues, greens, and pink. Shining gold elements are scattered throughout. It features fractal iterations with precise, super crisp clear details.