3.0 I like Helzberg's, but I do not like that they don't guarantee their products for just about any length of time Unless of course you pay further for that lifetime warranty. I bought my granddaughter an "H" necklace & lower than three months afterwards, the chain clasp broke. I https://blockchain-news61471.mybuzzblog.com/11445715/examine-this-report-on-initial-necklaces-diamond