Ivory Periastron The Last Periastron ?

Ivory Periastron is the newest Periastron in the Periastron collection. Since the very first Periastron came to Roblox the number of instock decrease making the newer Periastron more valuable than the older ones. The number of instock been 500,400,300,200,150 and 125... There's no doubt about it if there was for a new Periastron to come out it would be 100 instock. Can anyone guess what would the next color be ? (I'm guessing gold)