BMB Jewels


All pieces are made in Portugal, with silver sterling 925 and silver 925 with gold plated. CINCO pieces are certified by INCM - Imprensa Nacional - Casa da Moeda, S.A. INCM provide this assurance by checking the legal touch (precious metal per thousand contained in an alloy) and the application of contrast with the responsibility mark, manufacturer or equivalent.

Please check here the legal trademarks of portuguese INCM:


  • All articles are legally marked, when applicable;
  • All pieces are made of 925 silver, unless otherwise stated;
  • The buyer can check the services of the Contrastaria, in case of doubt of the authenticity of the pieces;
  • The site is managed by Colares de Água, Lda. with vat number PT510738150;
  • Daily price of gold, silver, platinum and palladium::
Any doubt please contact us at: [email protected].


The new marks from the testing office come into effect on January 1, 2021. As of that date, the testing marks will have the following symbols specific to each precious metal and each legal detail:


The sale on the national territory of jewelery artifacts marked under the Convention on the Control and Marking of Precious Metal Artifacts (Vienna Convention).
The Common Control Mark (CCM), or Convention Mark, consists of the reproduction of a scale and a number, in Arabic numerals, expressed in thousandths, indicative of the touch of the precious metal, framed in a perimeter indicative of the type of precious metal .


The Convention marking system consists of affixing the following marks:
  • Brand of Responsibility;
  • Contrast mark;
  • Common Control Mark (CCM);
  • Ringing number, in Arabic numerals.
Contracting States to the Convention:
Austria, Latvia, Cyprus, Lithuania, Croatia, Norway, Denmark, Poland, Slovenia, Portugal, Finland, United Kingdom, Netherlands, Czech Republic, Hungary, Slovakia, Ireland, Sweden, Israel, Switzerland, Serbia.
Official Convention website:
List of entities with contrasting marks recognized by the Portuguese Quality Institute.