Tanzanite International Free gift offer for purchase of tanzanite earrings Nassau Bahamas

We went on Carnival cruise 5/17-5/25/13 and were invited to shopping seminar. The ship shopper outlined areas best to shop. If you purchased tanzanite earrings for $140.00 you got a free necklace with tanzanite pendant. We like others sought out this place and paid the money for the earrings, the free gift was provided in sealed pkg, we asked if the setting for the necklace was sterling silver, the salesperson assured us that it was! I got it home and looked at it with a jeweles loop to discover it is not marked anywhere 925! So not everything that glitters is real! I am going to complain that people are being steered to these type of places to get ripped off, I guess they figure that they will never see these people again so like lambs unaware are ripe to be ripped off! Glad I didn't spend more than that in this or the diamonds international place that gave away junk with a purchase!!! Let the buyer beware I guess!