These beads are 6mm in diameter and they are absolutely gorgeous. They are heavy weighing 151 grams. The strands are approximately 18, 19 and 20 inches long. They are hallmarked TR-118 and are post 1980. The bracelet shown with this necklace is listed on my site and is an Antonio Pineda concave link bracelet which looks stunning paired together. I love the beads that were made from this time frame in Taxco because they have much thicker walls to the beads, hence making them less likely to dent or damage with wear. No dents or damage, just a great presence to the piece, LOOK AT THAT NECKLACE!