The body colour of pearls is normally related to the presence of natural colour pigments produced by the mollusc during pearl formation. Another option is to colour pearls artificially, with dyeing being the most readily available method. Often applied to rather low-quality freshwater cultured pearls, these tre

First published in Facette 26 (May 2020) As a foremost authority in the testing of natural pearls, the SSEF has had the chance in the past few decades to see and analyse the most unique and outstanding natural pearls in the market, many of them of historic provenance, such as the Peregrina pearl (see

Testing pearl necklaces can be rather painstaking work, as at least two gemmologists at SSEF meticulously and individually check a necklace pearl by pearl, with the aim of finding one (or more) cultured pearl(s) possibly hidden somewhere in the strand. Countless natural pearl necklaces tested at SSEF in the pas

first published in Facette 21 (February 2014) In 2013, SSEF received a lot of beautiful small so-called Pipi- pearls from the Pacific. These natural pearls are generally rather small, up to about 8 mm in diameter. This is not astonishing as they are formed within the rather small shell of the Pinctada macu