Assay Office
FB
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Frillybylily 2015 | 2018 | 18ct gold ring | Fairtrade Mark |
FE
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Fred E Ullmann 1973 to date | 2018 | 18ct yellow and white gold diamond ring |
FR
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | F R Stanhope ltd. 1962 – 1985 | 2019 | 18ct gold diamond set full eternity ring |
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | FRZ (Prestige Watches and diamonds) | 2019 | 18ct yellow gold and silver stone set dress ring | Pawnbrokers and Jewellers |
 | Prestige Watches and Diamonds | 2019 | 18ct white gold diamond set bracelet | Pawnbrokers and Jewellers |