Since everybody has been coming up with new Unique gem ideas i decided to share mine
A unique gem with the value of 0 . YES, you read right ,"zero". It's main abbility will be to disguise( ) all 3 of the gems during a ritual with the appearance of the highest gem. For example, put the unique gem + one crappy gems (150) + one 100K golden gem and they will all look like small golden gems( since the biggest is 100K).
The other abbility will be to increase it's value by 1000 after each ritual. That means no mather what gems you use in the ritual the unique gem will only increase by 1000 ( even if you put 999 999 gems ). This may depend on the guild bonuses !
+ since it's value is 0, if sb raids you he will not steal it with "Best gem chance". ( unless you've used it too long and it's value has become the biggest, of course)
+ You can make some serious skulling with it, while putting one crappy gem and one spiked/deep spiked/golden ( for example, 150 gem + 150K gems) and the unique gem. ( you may loose the golden, but you can always retrieve it ... so who cares )
+ it will make raiding way more fun.
- " ... this gem will be too overpowered ..."
I leave the Cons to you )