Hélène Courtaigne-Delalande . The Ultimate Guide to Birthstones for Jewellery Explore the meaning and properties of gemstones with our comprehensive birthstone jewellery guide. Ideal for finding a gift or expressing your individuality! Révélations Biennial : 30 jewellery designers you can’t miss ! Don't miss the thirty designers who will be present at the Révélations trade fair which will take place in Paris from 9th to 13rd June 2022. Hélène Courtaigne Delalande, a designer worth gold Hélène Courtaigne Delalande is an artist worth discovering. Good as gold, this designer presents us her handmade jewelry pieces adorned with gemstones.