Sheffield Assay Office

• About Us
  • History
  • Accreditation
  • The Assay Master
• Services
  • Hallmarking
    • Hallmarking Price List
  • UK Hallmarks
  • Lasermarking
  • Mixed Metal Marking
  • Control Marks
  • Convention Marks
  • Prices
  • Private Assays
  • Training and Conference Facilities
• Analytical Services
  • Analytical Services - An Overview
  • Nickel Testing
    • Short Nickel Test
    • Analytical Services QC Test
    • Nickel Testing Fee List
  • Jewellery Testing
    • Jewellery Testing Fees
  • Precious Metals Analysis
  • Mercury Screening
    • Mercury Screening Kit Request
  • Metals and Minerals Analysis
  • Environmental Analysis
  • Healthcare and Medical Research
  • RoHS and WEEE
  • Training
• The Library & The Sliver Collection
  • The Collection
  • The Library
  • The Silver Collection
  • The Office Archives
  • Mark Identification
  • The Mary Parsons Charity
  • Enquiry and Research Service
    • Terms & Conditions Research
  • General Enquiries
• News/Press Office
  • Latest News
  • Register for e-newsletter
  • The New Building
• Publications
  • The Sheffield Assay Office Register
  • Old Silver Platers and their Marks
  • Sheffield Silver 1773-1973
  • Bradbury's Book of Hallmarks
• Useful Links
• Contact Us
  • Office Details
  • Location Map
  • Enquiry Form
  • Job Opportunities

Control Marks

• Hallmarking
  • Hallmarking Price List
• UK Hallmarks
• Lasermarking
• Mixed Metal Marking
• Control Marks
• Convention Marks
• Prices
• Private Assays
• Training and Conference Facilities

The sponsor's mark, fineness mark and the assay office mark are compulsory marks. The crown on gold, the lion passant for 925 silver, and the orb for 950 platinum and the date letter in all cases are voluntary additional marks.