Assay Office
CA
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | CAD | 2019 | Platinum diamond set dress ring | Birmingham / Mumbai |
CC
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Curtis Chain | 2020 | 18ct chain |
CG
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Charles Green & Son | 1955 | 22ct wedding ring |
CP
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Cooksons Precious Metals 1999 | 2018 | 18ct Dress ring | EMA mark & Millennium mark |
 | Cookson Precious Metals 2000 | 2019 | 18ct dress ring | EMA mark, Millennium mark and CCM |
CR
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Coloured Rocks 2014 | 2019 | 9ct yellow gold Gemstone Ring | Internet Shopping Channel |
CY
| Mark | Maker | Dates seen | Seen on | Comments |
|---|---|---|---|---|
 | Coley Bros. 1926 | 2018 | 9ct yellow gold dress ring |