'Cluster rings are rings with a group of stones in a cluster setting, forming the focal point of the ring. The cluster setting usually consists of one large stone (usually round or oval) in the center surrounded with several smaller stones.' (source: here)
That's the essay-type definition. If you ask me, I would say cluster ring is a beautiful, eye-catching ring with big diamonds/ stones that makes you look elegant and stunning (finger crossed). And....if you have bruise on one of your fingers...cluster ring is big enough to help you cover it. True story.
The first three look more like engagement rings kan..
The last one..ya ampunnn.I saw more or less like this one last week in carboot sale. Brand new ring...brand new which costs only 4 pounds! But probably the uk people is soo big. the ring is too loose for me. So sad.So sad. Better luck next time.