A natural certified ruby is a ruby that is found in nature and has been certified as genuine and untreated by a reputable gemological laboratory. The certification process typically includes a thorough examination of the ruby’s physical and optical properties, as well as a review of its origin and any treatments it may have undergone. The most common gemological laboratory that provide certification for ruby are GII,GIA, AGL and AGS. A natural certified ruby is considered to be more valuable than a treated or synthetic ruby.