R*I*P*P*E*D off by Forever Jewellers

How horriffic to find that I bought a diamind ring in 2018 from Forever Jewellers in Durban North for R49500. The price of Gold and Diaminds has gone up by 20% since then and I have just had it revalued as I need to sell

The actual value of the ring in 2023 is R42,000.00 I was ********** by about R20k!!!

My question is what are Forever Jewellers prepared to pay me to take the ring back?