I am sceptical of the nature of these recent price rises.
I do not believe it is from consumer demand.
I smell a rat.
I suspect that larger high clarity goods are living in dark places (like safes) and will come out to play soon and those who own them will hope to make a killing. Some will, but those who hang out too long might get caught red handed.
Meanwhile SI1 and VS2 are a relative bargain, and I believe they will outperform in the long run because they make sustainable sense.
Lab SI2 has dropped so much that they desrve to be a little cheaper - there is more SI2 than ever before.