Fake Historic Provenance: ‘Aged ’ Cultured Pearls
Most recently, we received a pearl necklace with 410 pearls strung on three regularly graduated strands. The pearls were characterized by a beautifully matching colour and a fine pearl lustre, reminiscent of ‘classic’ natural pearls from the Arabian Gulf. However, a closer look using X-ray luminescence (SSE
Rubies with Oil in Fissures
Over the past few years, the SSEF has repeatedly seen gemstones (apart from emeralds) which contained fissures filled with oil or other fillers. These include rubies, sapphires, spinels, tourmalines, garnets and even rarities such as pezzottaite.
Sapphires Heated with Pressure – A Research Update
Sapphires Heated with Pressure – A Research Update. Pub […]
Cobalt diffusion-treated spinel
Cobalt diffusion-treated spinel. Published in IGC Namib […]
Emeralds and the saga of cleaning and filling fissures
Emeralds and the saga of cleaning and filling fissures. […]
Ruby heat treatment and fracture repair
Ruby heat treatment and fracture repair. Published in J […]
Species identification and treatment detection in dark coloured pearls
Species identification and treatment detection in dark […]
Be-detection by FTIR on corundum; a preliminary report
Be-detection by FTIR on corundum; a preliminary report. […]
L’identification du traitement HPHT au SSEF (2015)
Presentation by Jean-Pierre Chalain at 2015 Swiss Gemmological Society conference on HPHT treatment detection at SSEF
Contributions de la gemmologie de laboratoire à l’identification du traitement HPHT du diamant
Contributions de la gemmologie de laboratoire à l’ […]