I counted how many times you need to click to upgrade a +0 item to +50 whereas it takes about 6 clicks to +1 an item *50 you’ll get about 300 clicks just to +50 an item. What if we intend to +500 an item? It’ll take about 3000 clicks and assuming that each process of clicks takes around .5 to 1 second to execute, you’ll get about 3000 clicks in 1500 - 3000 secs/ 25 - 50 minutes, that is if you click constantly and without rest.
I propose why not enable players to craft perfect jewels with jewel shards equivalent to the number of + a perfect jewel can give e.g (perfect jewel c gives +20; crafting recipe 20 jewel c shards). It’ll make the upgrading process less time consuming and more player friendly.