2015 what a recognition year.

After beeing awarded Gemologist of the Year – Spain 2015, William has also received the 1st price in the Sector: Luxury Goods & Jewellery – France 2015     by AI M&A Award magazine.

Always helped by his faithful designers his success is the result of a simple and modern savoir faire which always offer custom made and handmade work.

In sum unique jewelry. At the time of multiplication and labor widespread William draws inspiration from his travels the people he meets on his way.

After five years in French Polynesia, he became one of the rare true “Tahitian Expert” a real “Black Pearl Expert”. From Bora Bora and his many visits to the pearl farms, he has been trained on the pearl birth process.

In 2006 he has been awarded from the GIA (Gemological Institute of America) in London as Pearl Expert. The GIA’s mission is to protect all buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality worldwide. Therefore Tresor Noir and William de Marsangy can follow the convention of the GIA and deliver a certificate of authenticity for each pearl purchased.

In 2008 William set up his first jewelry store in Bora Bora helped  by his former employer.

An encounter will definitively change his life. His wife from Mauritius who worked in the best resort of the island where William was exhibited his creations during fashion shows.

She managed to convince him to come to Mauritius and settle there.

This was done in 2010 when William arrived in Pointe aux Canonniers and created the Atelier by William which becomes 2 years later Tresor Noir.

More than an invitation to travel, this young man full of passion and enthusiasm will strikes your mind.

Long Live to Tresor Noir.

Long Live to the Black Pearl Expert



 “You are already a unique creation” William Marsangy, Tresor Noir Founder

Gemologist and Black Pearl Expert “Expert en Perles de Tahiti” you can find William in Europe, Mauritius and French Polynesia.

All his creations are hand made.

Each pearl bought is coming with its certificate of authenticity which guaranteed its quality and origin.

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