Hallmarks can only be seeing with a magnifier.
The swastika hallmark probably pre-ww2 giving this ring a historical vintage...
18k Yellow Gold Old Cut Diamond Ring.
This piece features 5 old cut diamonds ranging in size from 0.02ct to 0.05cts. 0.10TCW.
Diamonds are I-1 clarity grade, H-I-J colour with fair polish, poor symmetry and fair proportions. 
Ring is in very good ready to wear pre-owned condition.
Purchase includes original appraisal.
For a FULL detailed description, please refer to the appraisal picture in this listing.
Ring weight: 1.60 grams
Size 3.75 (resizeable)
Metal Type: 18k Yellow Gold