Assay Office
PE
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Petra Jewellery London (2015) | 2020 |
PJ
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | P J Finch & Son. (1977) 1975 -1985 | 2019 | All platinum diamond set ring |
PM
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Platinum Mounts Company 2017 | 2018 | Platinum diamond set ring | Casting House |
 | Platinum Mounts Company 2017 | 2019 | Platinum diamond set Ring | Casting House |