News releases AMF: 2016

The Autorité des marchés financiers (AMF) issues a public warning concerning communication from BLUE STONE LTD and companies related to it with respect to diamond investment offers

Published on November 4, 2016

The AMF warns French investors against marketing material issued by BLUE STONE LTD via several web sites proposing offers to invest in diamonds.

BLUE STONE LTD, whose head office is located at 3rd Floor, 120 Baker Street, London, England, W1U 6TU, proposes offers to investors residing in France to invest in diamonds – while emphasising the attractive financial return –, directly or indirectly via at least eight web sites (,,,,,,,

In view of the uncertainty as to the nature of the activities carried out by BLUE STONE LTD and companies related to it and given the unbalanced character of the marketing materials, notably the absence of a mention of risk, the AMF recommends that investors do not take up these solicitations from said entities and do not communicate them to third parties, in any form whatsoever.

Lastly, the AMF reminds investors and individuals responsible for marketing investment products to follow these safety guidelines before making any investment: 

  • no advertising materials should make you overlook the fact that high returns always involve high risk;
  • learn as much as you can about the company or intermediary trying to sell you a product (authorisation/certification, company history, location of head offices, etc.);
  • only invest in a product you understand;
  • ask yourself how, and by whom, the purchase price or selling price of the advertised product is set, and find out the precise terms and timeline for selling the product, especially in cases where the product invests in an asset class with low liquidity. 


About the AMF
The AMF is an independent public authority responsible for ensuring that savings invested in financial products are protected, providing investors with adequate information and supervising the orderly operation of markets. Visit our website

Have questions?
Please contact the AMF Retail Investor team at +33 (0)1 53 45 62 00 from 9 am to 5 pm, Monday to Friday. 

Press contact:
AMF Communication Directorate - Caroline Leau - Tel : +33 (0)1 53 45 60 39 ou +33 (0)1 53 45 60 28 


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Legal information
Head of publications: The Executive Director of AMF Communication Directorate.
Contact: Communication Directorate – Autorité des marches financiers 17 place de la Bourse – 75082 Paris cedex 02