An early 20th century diamond cluster ring

Description

claw set old brilliant cut diamond, diameter 3.7mm, surrounded by eight partial rubover set old brilliant cut diamonds, estimated approximate total weight 0.60ct, tapered grooved shoulders, 'D' shaped shank, size K, unhallmarked, stamped '18CT', settings tested as platinum, weight 2.9g

Condition report:

Overall condition: Good
Diamonds are all present
Wear to setting edges, consistent with age
Chipping to diamonds, consistent with age
Solder joins in shank, possible re-size
General wear and tear to mount