Grey diamond is not used in jewelery. Why
Answers
Among all colored diamonds, gray diamonds are relatively unknown - and that's a shame. There are several reasons that may explain it, but the first may just be its rarity.
Gray Diamonds are quite misleading - but in a good way. They are extremely rare. Far more rare than yellow diamonds and brown diamonds even though price wise they are located near them in the lower range of fancy colored diamonds prices - making them a very interesting buy. In fact, their pricing is so attractive that they can even be considered an alternative to white colorless diamonds simply based on the price.
On top of that, while all colored diamonds came to consciousness / awareness as alternative & fashionable solution only in recent years, the trend originated from the more familiar and stronger colors such as pink and yellow and only after evolved (and keeps evolving).
It will be in colour in grey but it will go so they will not use grey daimond