This is one of the highest quality Byzantine chain I have ever seen and tested.

18k over solid stainless steel core weighing 148grams with a clasp that has one side lock at each end plus matching bracelet

Never been used still has its original tag.

26 inch long, necklace 8mm wide , 148 gram

8.5 inch long , bracelet 8mm wide 74 grams

These retail for over $300