There’s no hiding this large inclusion, but it is common practice to cover it for protective purposes.

A setter will deliberately cover an inclusion near the edge of the diamond with a mounting prong, not to deceive an unwary buyer, but to give a more pleasing appearance under 10x magnification, and also to protect the inclusion from possible damage. When near the girdle surface, feathers are especially apt to open up, or cause chipping, with a sharp blow. A prong can serve as a guard against such an occurrence. Chips themselves are also commonly covered up by prongs to protect from further damage and to hide from sight.