A dear friend inherited beautiful Art Deco originals , need advice

Hello all ,a dear friend of mine has inherited a fair amount of Art Deco
jewelry mostly set in white gold , with lots of diamonds this came all
from her mothers collection , her family where in the diamond business in
the 30s and 40s therefore the amount of diamonds , the craftsmanship is
quite amazing and it would be a true pity to recicle them in to metal and
stones , Does anyone know where can she offer this kind of pieces ?

I would think about the big auction houses, but if they are not an option, here’s an online venue: https://www.1stdibs.com/

I have quite a few contacts and would be pleased to assist you @Yves_Roldan feel free to message me