RubiesBE textures do not weigh anything in Minecraft for Android. They have the same resolution as vanilla. By the way, we do not know whether they are compatible with the mod, which adds the ability to craft items from emeralds.
RubiesBE texture pack, by the way, in Minecraft Bedrock Editing are more noticeable than regular emeralds. Underground in the game, you definitely will not miss them. This texture pack is not compatible in Minecraft Bedrock Edition with any other that modifies blocks. Most likely, none of the MCPE will work when combined, as with similar mods.