This one is for Max Nener who said Rubys are minecrafts best block, although in this case it would be minecrafts best block to ever exist, as it is no longer a part of the Java edition. It has moved on/originated to being one of the In-game currencies of Minecraft Earth, now i admire Mojangs thoughts into employing a new type of currency into the Minecraft Universe, as i can imagine some people would've found it frustrating to see emeralds as a currency, as it is already used as one to trade with villagers in Vanilla Minecraft.
        Below is a blurry image of Minecraft Earths in game shop where you can buy Rubies

Although it does have me wondering, had they kept the block in Minecraft Java, what would its used be, as while it was in the game, it was more of a decoration item/block then anything else. Tools for it were never made, uses for it never existed outside of Minecraft Earth, it makes me wonder what they could have done for it. Maybe make new types of villagers that only trade with Ruby, although depending on the difficulty of finding these Ruby's, some people might be disappointed.

Another possibility is the employment of  Ruby tools and armour, but the question stands, where would it be placed in the ranking system? Would it be better then diamond? More lasting then gold? Easier to craft then leather? Well on the Mohs scale of mineral hardness, it is a 9/10 (10 Being diamond and carbonado) So no, it would not be stronger then diamond BUT it is nearly 2 times stronger than iron so maybe close, but no cigar.

 Below is a picture of most of the Moh scale ( This picture contains Gold, iron, Ruby and Diamond.)

Overall i give Rubys a:

Affordability 1.5/5 As they can cost literal money to obtain, that as well as hard to find.

Usefullness: Minecraft Earth 4.5/5 Very useful, used to speed up any task, exchange for certain things, and also used to purchse ruby exclusive items. But they are a bit stingy with it and the prices.

Minecraft Java 1/5 Apart from a decoration block i see no use for it.

Looks 2/5 It looks nice, but too similar to the re-color of the emerald block.

Is it Minecrafts best block? NO!