Where’s the best place in Houston to sell diamond jewelry?

I’ve got a small collection I’m looking to sell and I’m trying to figure out the best spot in Houston. I have two diamond engagement rings (one 0.75 ct round brilliant and one 0.5 ct princess cut), a pair of 0.3 ct diamond stud earrings, and a 14k gold tennis bracelet. Everything is in great shape with certificates for the rings.

I searched around and found “jewelry buyer houston” online and ended up at a place that quoted me $8,500 for the lot. That felt better than the $7,200 I was getting from a couple of pawn shops, but I’m not sure if it’s the highest I could get. Has anyone sold similar pieces here? Where did you go and what kind of offers did you see?