If the first one is a large marble it may be a Vacor āUnicornā (Opaque white base with blue, red, green, yellow pastel swirls. Iridescent finish.) The larger Vacors can be blended like this or not so definitive in the striping. Jabo is a good guess otherwise.
The second one is pretty cool, it looks blue until you backlight it then it appears to be green. I would say that it is a Master Made Marble.
Size always matters.
All opinions are welcomed and needed.
MarbleāOn!!