Top 10 Gemstones that are Number 1 in a Particular Category
The Top Ten
Only two painite crystals have been known to exist since its discovery in 1956. Painite is on The Guinness Book of World Records as the rarest gem mineral. Its hardness is excellent - 8/10, same as topaz. - Metal_Treasure
Whoa! Looks cool! - BorisRule
But what if entire earth mantle is made of painite you never kno
Woah! - LightningStrike
Jadeite is not the hardest gem (diamond is) but jadeite is the toughest.
The difference between hardness and thoughness is that hardness is resistance to scratching while toughness is resistance to mechanical shock, such as hitting it with a hammer or bumping it against a hard surface. Toughness is resistance to cracking or breaking. Because of its toughness, it was first used to manufacture ax heads, weapons, and tools for scraping and hammering. It has been used for over 5,000 years.
There is an old saying that, "if you hit a diamond with a hammer, it will shatter into a dozen pieces. If you hit a piece of quartz with a hammer, it will split in two. Hit a piece of jade with a hammer and it will ring like a bell." - Metal_Treasure
I wanna try smashing that thing with a sledgehammer and see what happens. I hope it doesn't break. - LightningStrike
I better make a titanium suit and incrust with Jadeite then. - X_the_Unown
Hardness is resistance to scratching. If you rub a diamond against any other gem, diamond will scratch all of them. But no other natural gem can scratch the diamond.
That's why its hardness is 10/10. - Metal_Treasure
Also the most expensive - BorisRule
You can see why although the image doesn't show all possible colors tourmaline can exhibit - tourmaline crystals can have different color combinations. Tourmaline also occurs as mono-color crystals that can be different colors - blue, red, green, all colors actually. - Metal_Treasure
Looks beautiful - BorisRule
Looks brilliant - LightningStrike
The oldest zircon crystals are from the Jack Hills of western Australia. The sample found there in 2014 is literally from the beginning of our planet! The analysis was made by Professor John Valley, a geo science expert from the University of Wisconsin, US. - Metal_Treasure
They are very similar, including moissanite hardness at 9.5/10.
Moissanite even does one thing better than diamond - it sparkles more than diamond. - Metal_Treasure
Black Diamond is the diamond that is the most resistant to mechanical shock (see above - Jadeite).
Also, Black Diamond is the most mysterious diamond - probably the only type of diamond that can't form on Earth: it probably can only form in outer space and then comes to Earth with meteorites (for more details, visit the list Top 10 Gemstones Formed with Extraterrestrial Help) - Metal_Treasure
I think my mum has both black diamond and normal diamond on her wedding ring. - X_the_Unown
This information is unique - BorisRule
Black is a cool looking color on a diamond.
Ooh... Pretty... (You might want to hide it from me.) - X_the_Unown
And the most expensive diamond - Metal_Treasure
When you say "cat's eye", it means this particular gem only. It's because it exhibits the finest "cat's eye". To indicate the cat's eye phenomenon in another stone, e.g., in aquamarine, you have to say "cat's eye aquamarine" or "cat's eye tourmaline", and so on. - Metal_Treasure
Cubic zirconia is the most gemologically and economically important competitor for diamonds - Metal_Treasure