Assay Office Praha
Kozí 4
110 00 Praha 1
entry & issue: 225 982 271
auto exchange: 225 982 111
 Česká verze 28.2.2020

AO Home
Obligatory published informations
Provided services
Electronic mail room
Requests for Info
Tariff of Fees
Registered Jewellers
Identification marks
Personal data protection



Provided services

1.Verification and marking of Goods (Jewelry), Product Verification (Investment Ingots, Medals, etc.)
Pricelist - Contacts - Form
2.Analysis and melting
Pricelist - Contacts - Form
  • Qualitative detection of metals
  • Approximate determination of the fineness of precious metal alloys
  • Chemical analysis of materials containing the precious metals
  • Melting of materials from precious metals to ingots
  • Accredited testing laboratory
3.Sale of acids
Forms(czech only) + Sales places (Praha, Brno, Ostrava, Jablonec n/N, Turnov, Č.Kostelec) Safety cards of acids (czech only)
4.Sale of printed matter
Valid legislation in the field of hallmarking  (1 pcs/25 CZK)
List of the Hallmarks(1 pcs/25 CZK
Blue card – Hallmark(1 pcs/25 CZK)
5.Registration of entities
Forms -
6.Expert and opinions
7.Commission of Valuables - Auctions
+ official message board
8.Expert activities
normalization in precious metals – ISO (WG1, TC 174) and CEN (TC 283)
9.International aktivities
  • Valuation of jewellery
  • Gemology (gemstones)
  • Workshop about Hallmarking
  • Workshop of testing on the touchstone