If you're looking to boost your character -- and the ability to maximize your character is really what Diablo IV Gold is about -- you'll need lots of legendary gems. You need to select the ones that be suited to your specific build, score high star ratings, to upgrade the gems you are using, and eventually add gems to the additional resonance slots. It's endless.
There are a lot of Diablo Immortal's currency upgrade paths, and reward mechanisms, legendary gems are the area where the business model eats hardest. Blizzard and NetEase haven't been as stupid as to sell directly using a loot device or gacha, however what they've come up with could be, in some way which is more alarming. Legendary gems only drop from those bosses found in the randomly generated Elder Rift dungeons, and you can only guarantee an epic gem drop by applying the legendary crest modifier the dungeon in advance of starting the dungeon. In other words, the rates of drop of legendary gems are low.
Without spending any money on the game, you will only collect one legendary crest every month, and even buying one of the battle passes will give you only one or two other legendary crests each month. Beyond that, you need to purchase them from the source. Legendary crests cost approximately $2 and $3 apiece. The large number of gems required to maximize your character's equipment, especially considering the extremely low drop rates for five-star gems, is the reason why the cost of maxing the character's stats for Diablo Immortal has been estimated to be between $50,000 and $100,000perhaps more when you're deep into the system of gem resonance. (Rock Paper Shotgun has an exhaustive breakdown of costs that is located at the prudent end of the spectrum.)
Diablo Immortal has been given an extremely rough ride in this business model Perhaps disproportionately due to the fact that popular free-toplay rivals like Genshin Impact and Lost Ark are not without similar gacha mechanisms to draw in high-priced "whale" customers. Diablo's name and fame among its core PC gaming community, built up over the span of nearly a quarter century, is certainly an element. It's also the case that buy Diablo 4 Gold is a particularly problematic system and the nature of Diablo games is an impact on that.