This impressively looking Cluster Ring 

is centering a square panel set with 4 Princess Cut Diamonds, 

4-claw set within invisible setting, 

that truly seems like one impressively large Princess Cut Diamond from the distance

(that would be equal to at least a 75 points / 0.75ct stone)

within a Cushion Shaped frame of round brilliant cut diamonds 

of sunlike brilliance, 

that adds that luxury look & further highlights the centerpiece 

Gracefully flanked by elegant tapered shoulders, 

embellished with 10 round brilliant cut diamonds 

Piece features a Fancy Gallery, 

finely detailed & embossed with lovely foliate motif 

Total approx. diamonds' weight: 0.85ct 

Total number of diamonds: 26

Diamonds' colour & clarity: F-G, VS 

Total item's weight: 5.3gr. 

Ring's size: O (re-sizable)

for an Official Ring Conversion Chart refer to:
https://www.stpetersburggallery.com/single-post/ring-conversion-chart

illusion setting is a great & smart choice for cluster rings