Details:
Chain Size Reference

We ship orders 5 days a week, Monday to Friday. Any order placed in weekend will be processed on the next Monday. Usually it takes up to 48 hrs to process the shipping.
We offer 7-12 business days standard delivery. Orders over $99 will get free shipping. Orders below $99 will be charged the flat rate of $3.95 to $9.95 depending on different countries.
Also, we offer paid DHL Express options for US customers from $34.99 to $39.99 which usually delivers in 3-5 business days after shipping.
First of all, this item will not pass the diamond tester. Second, within a month or 2 it will fade almost completely to brass on the underside and will turn your neck more green than you'd think was ever possible. I bought this item in December, and within a month the clasp had faded and a stone had fallen out. Now being March, the underside is almost completely faded down to the base metal and is un-wearable. Definitely not worth $170usd. Sorry, but I'm definitely never buying from this company again.