Literature Reference: 无瑕出自《诗经·卫风·淇奥》：“瞻彼淇奥，绿竹猗猗。有匪君子，如切如磋，如琢如磨。” The phrase '无瑕' is derived from 'The Book of Songs·Wei Feng·Qi Ao': 'Gazing at the bend of the Qi River, the green bamboo is lush and graceful. There is a noble gentleman, refined and polished, like jade carved and perfected.'
无: No, it's clean, won't happen.
瑕: A piece of red jade, symbolizing excellence and flawlessness.
Meaning: Flawless, like a piece of pure jade, symbolizes noble character and untainted purity.