This is a lovely necklace on its own, or to wear with a pendant.  It has beautiful workmanship.  Pay attention to the measurement (2.5mm), the picture makes it look larger and heavier because there is a lot of beautiful detail to show.  I think the 2.5 mm is accurate.  The closure is secure, I was worried that the hook closure might open too easily and get lost, but I don't think this will be a problem.  I am very pleased with this purchase!