Hi Manfred! I hope you take out the invention with implementation into production? It costs a lot! I like those production! I got a very beautiul earrings for Olga for her wedding in Praga and for me that time! I am not a great expert in the field of jewelry.Jewellery Swarovski I really appreciate! But the fate of our invention (in ventilation) is very sad. I ll tell later about that...I do not want to talk about bad news in the background of such beauty!!!