The fee of a solitaire diamond ring varies based on several factors, such as the first-class of the diamond, the scale of the stone, the kind of metal used for the band, and any extra details or elaborations. On average, a primary solitaire diamond ring with a small, low-first-rate diamond set in a simple gold band can cost everywhere from $500 to $2,000. a larger, higher-best diamond set in a platinum band with a greater complicated putting can value upwards of $10,000 or extra.