Genuine Diamond earrings and pendant

I have a pair of beautiful diamond earrings that I’ve only worn a handful of times, and the diamond pendant also barely worn, but the actual chain that’s pictured is broken. All genuine diamonds, the earrings have 18 princess cut diamonds, and the pendant has 5 round diamonds. The pics don’t do them justice! I don’t have the papers for them, but recently got an estimate of $700 for both from Andrew Jewelers. They only accept trades, and I just need to sell. Posh authenticate over $500