This is a gold necklace with a 4K hallmark. The purple gemstone is a mystery, but considering who gave it to me, I suspect it might be genuine (though I haven't had it appraised, so I can't say for sure). Also, as you can see in the photos, the chain is broken. I don't have the skills to fix it, so it will be shipped as is. Please be aware of this. I was going to throw it away because the chain was broken, but then I noticed the 4K hallmark. I'm offering it for sale to someone who can repair it and use it. Thank you for your interest.