Thunderstone

The thunderstone is a new gemstone released with the New Ventures update. It's untradeable so it can only be obtained by cutting an uncut thunderstone or as a drop from monsters. Most players who receive the gem would turn it into jewelry, since the jewelry is extremely powerful. It is the best type of gem in RuneScape requiring 110 Crafting. Only a few monsters, such as Nymph spearwomen and Elven guardians, drop this gem, but it's Ghostly Rare. It's the only gem to not have respective bolts when cut as if you attempt to do so, a message will say "As you cut the gem, the gem doesn't make a dent and remains intact."

History
For a long time, players have struggled to gain this particular gem as it was so rare to find. But at last, on May 11, 2011, a player named "Its Lu Bu" found it when mining on top of Mount Trinity in Carydwyn. He said that it took him roughly 7 days mining at the same exact spot for one, meaning it takes nearly about 104,256 swings at the rock for one.