gr59-this Australian sapphire predominately exhibits a beautiful blue tone but will occasionally throw tints of yellow & green. it exhibits magnificent brilliance and sparkle, both indoors and out. Would go excellently in jewelry. I have placed this in the blue sapphire category but since I listed this stone I took it to the gemologist because I could not understand why no-one showed any interest in it. she verified it to be a blue sapphire. She also informed that I have massively under valued the stone and its true price is $462.95 US. I have added the cost of the evaluation certificate to the price but the stone is still under valued as you will be able to see from the photos I have included of the evaluation certificate.