No official digital storefront currently sells Diamond Rush, as Gameloft has abandoned its Java catalog. Therefore, most ROM downloads fall into a legal gray area (see Section 7).
There are three primary reasons people search for "Diamond Rush ROM" today:
is a classic puzzle-action game originally developed by Gameloft for older mobile phones (Java ME / J2ME platforms). It was very popular on devices like Nokia, Sony Ericsson, and Samsung feature phones in the mid-2000s.
The Internet Archive has massive collections of abandonware and legacy mobile games. Search for "Gameloft Diamond Rush Java" and you will often find bundles containing multiple screen resolutions.