Hi. Welcome. That's a "Contemporary". A modern handmade marble.
Sometimes a maker will leave a signature. Do you see any letters or numbers which appear painted on or etched in?
Condition needs to be judged in person. From the pictures it looks like this will be NM+ or M. (Near-mint plus or mint.) It takes time to learn to grade marbles. They need close inspection. You need to develop an eye for any little nicks or subsurface reflections ... without getting paranoid about it and blowing some microscopic defect out of proportion.
In the meantime if you're trying to sell, then provide nicely detailed photos of all sides of the marble.
Top: I think MK on the ends and Peltier Rainbo in the middle.
Bottom: That may be a Vitro Whitie on the left. Could be right about the last two being Alley.
Welcome! ... link didn't get there for me.
This seems to work: https://www.instagram.com/designsbybing/?hl=af
Nice pendant in your avatar over there. That blobby cane look really works.
Really? That orange is coming from the green? Naturally I considered the possibility that it was from some kind of blend, but I didn't see how we would get that as a blend, so I got my hopes up for Dindo.