Koi fish quartz suspends flame-orange to red flakes inside clear rock crystal — inclusions that flicker like koi glimpsed through pond water. A recent collector favorite, each stone's “school of fish” is arranged by geology alone.Our koi fish quartz is natural, certified by GEMIC Institute's gemologists and filmed stone by stone — inclusion scenes cannot be standardized, so you buy exactly what you see. Unique pieces; tracked worldwide shipping, 30-day returns.