This is one of my top manga series of all time.It's going to be getting an official English release this year and despite the series not being finished yet, i thought it'd be a good time to write a review of it for anyone who's curious about it.
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Story+Characters
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The story is very interesting and contains a lot of mysteries. It presents many questions about this world and it's characters. Like, who and what are the moon people? What is the managers goal? Where do these gems come from? and is there anyone else on this world?The series is not all dark and depressing either,as there is a lot of comedy here too which i enjoy.

The most intriguing part of this series for me were the gems themselves. All the characters aren't just named after gems, they literally are that gemstone and take on their real world properties.For example, Cinnabar is toxic and keeps himself away from everyone, whilst Diamond is one of the strongest fighters due to his hardness level which prevents him from breaking easily.

I really enjoy all the characters in this series,while some get more time in the spotlight than others, their personalities were distinct enough that i remember them well. Phosphophyllite is an amazing main character,without spoiling anything, lets just say he gets a LOT of character development.

Also an interesting thing to note is that all the characters are androgynous and refer to each other using male pronouns. Just another element that makes this series so unique.
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Art
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Very stylish. I love how the art shows how shiny these gems are,like how their hair refracts the light onto their shoulders. Although it is a little morbid seeing a character broken into pieces sometimes.

The character designs are great too, despite how most of the characters wear the same uniform, their hair styles are unique enough to tell them apart. Backgrounds art is also great, and it really sets the mood in some scenes.I like the use of solid black.
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Final thoughts
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Since it's not finished yet and i don't know when it will i'm giving the series a 9 overall for now. If it keeps being this amazing and answers all the questions i have,when it's finished i could easily give it a 10.That's how good this manga is.
Please give this manga a go if you're looking for something different from the norm!

(I also recommend watching the beautiful anime style trailer too, so you can join me in wishing it gets an anime series someday.)