The average diamond price on smp1 is 40r apiece in my experience the lowest I have seen resently was 35r.
this not a diamond price discussion, I just want people to sell me their diamonds, one more post that is off topic, I report it
As a discussion question you asked if the price was fair essentially. So most of us are just trying to help you attract buyers at a fair price.
You opened a poll asking if the price was low - personally I was just responding to that. 40r is still way too cheap for me I'll sell you diamonds for 51r each though if you're interested?