On-site testing

We regularly travel worldwide for on-site testing to test prestigious coloured gemstones.
Please note that diamonds and pearls are not tested in Bangkok and Hong Kong.

Upcoming on-site testing

11 – 20 Jan 2023    Bangkok
31 Jan – 05 Feb 2023    Tucson (AGTA)


We regularly travel to Bangkok for on-site testing to analyse prestigious coloured gemstones. Our office is in the gem trade district at the Silom Road. We are equipped with our mobile instruments and spectrometers, every gemstone is meticulously analysed. Please note that diamonds and pearls are not tested in Bangkok.

SSEF in Bangkok in 2023:

11 – 20 January 2023

22 – 26 May 2023

23 August – 01 September 2023



Please contact SSEF in Switzerland in advance or +66 (0)81 257 75 20 or +66 (0)81 844 33 52 during Bangkok on-site testing.

SSEF office in Bangkok:

Swiss Gemmological Institute SSEF, Silom 19 Building, Unit 513, 5th Floor, 45/1 Soi Silom 19, Silom Road, Bangrak, Bangkok 10500

Hong Kong

Hong Kong is one of the most important hubs for the gemstone and jewellery trade.

SSEF in Hong Kong:

We are present at the three major jewellery fairs in Hong Kong in March, June and September. At the September show we have a booth at the AsiaWorld Exhibition Centre (Airport) and at the Convention Centre. Please note that diamonds and pearls are not tested in Hong Kong.

Apart from testing your gemstones at the jewellery fairs, we also offer a pre-show testing services at our Hong Kong business centre, located in Central. This pre-show service is by appointment only.


Please contacting SSEF in Switzerland. Our local phone number in Hong Kong (during SSEF presence in HK) is +852 649 649 94.

Have you heard about our shipping services ?

Please note that items for testing can easily be shipped to SSEF using our shuttle services. This method, proven for many years with our shipping partner Ferrari, is the fastest way to obtain a fast expertise for your items.