I happen to live pretty close to
Fashionphile HQ and sold some items to them. The buyout price was 30% of the retail value for unused, designer, but rather uncommon, diamond pave rings. I assume the buyout price would be much higher for items such as Cartier love bracelet.
The facility itself is surprisingly nice and staff were very welcoming. Everyone wore masks and gloves when handling the goods. I brought in my items in person and got paid in 30min. If you are in SoCal, I think it might be worth the trip to take a look at their bags/drop off bags.