db.r6gd.12xlarge is an Amazon Neptune size with 48 vCPUs, 384 GiB memory (AWS Graviton2). In US East (N. Virginia) it costs $12.229 per hour on demand ($8,927.17 per month) for I/O-Optimized storage. It is sold in 9 regions; the cheapest is Asia Pacific (Hyderabad) at $9.964 per hour.
Prices by region
USD per hour, I/O-Optimized storage. Reserved prices are no upfront, standard. Cheapest on-demand first.