Club JewelleryKnowledgeInsider Advice: 10 Things I Would Never Do as a Jewellery Professionalby Katerina Perez
GemstonesColoured gemsGübelin: Is Gemstone Rating Set to Be the Common Certification System for Coloured Gems?by Katerina Perez
JewelleryEventsGübelin: A Private Dinner Party in Honour of the Release of the Mystical Garden Collectionby Katerina Perez