I.am sorry. What is your project. Is GIA E VS1 your center?
Or are you doing a graduated 5 stone? And you want 5 stones with those specs? Cause no one sends 20 and 15 pointers to GIA.
Your best bet is to call up either BGD.or HPD and work with them to get you what you want. They will have access to ideal stones in the sizes you want. And will be able to send you Sarin, ASET and pictures of the stones so you can feel confident of your purchase.