• RJC -Responsible Jewellery Council

• GemGenève 9 - 12 May 2019 

• Carat+ show 6-8 may 2018 Antwerp expo

• Antwerp diamond club 

• International colored gemstone association 

• Antwerp world diamond center 

• Gem encyclopedia

• Diamond bourse Antwerp

• DNA 

​

 

All about ruby

 

• All about ruby - wikipedia 

• gemstone.org

 

All about sapphire

 

• All about sapphire - wikipedia

• gemstone.org

 

All about emerald

 

• All about emerald - wikipedia

• gemstone.org

 

GEM LABS

 

• GRS 

• SSEF 

• GUBELIN 

• GIA 

• CARAT

• AGL

• AIG BELGIUM