Assay Office
J&
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Johnston & Popley 1948 to 1987 | 2018 | 18ct dress ring |
JA
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | John Alistair Donald 1972 | 2019 | 18ct abstract designed diamond set brooch | Noted maker |
JK
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Chain Reaction (1991 to date) | Ring |
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | A Private Individual | 2019 | A bespoke all platinum diamond set ring |
JL
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Jadales Ltd 1960 – 1985 | 2019 | Dress ring | Early supplier to Signet Group |
JO
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | JoC (A private individual) 2018 | 2018 | 18ct yellow and white gold bespoke diamond ring |
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | James Oliver Blackburn 1990 | 2019 | 18ct diamond set ring |
JP
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | JPF (A private individual) 2004 | 2019 | 18ct yellow and white gold two stone diamond crossover ring |
JV
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Jessie Ve Ltd 2019 | 2019 | Platinum diamond set ring | Bespoke maker |