A rewards currency is only meaningful if you can say what it is worth. Here the answer is specific.
The rate
100 diamonds = $1 = approximately KSh 130 of goods at a participating merchant.
Because one correct quiz answer earns one diamond, a hundred correct answers is about KSh 130 of shopping. That is a rate you can plan against rather than a vague promise of rewards.
Worth in goods, not in cash
Diamonds redeem against goods at merchants who have joined the redemption programme. They are not withdrawable and cannot be converted to money. Their value is real but it is spending value, in specific places.
That means the practical worth of your balance depends partly on whether merchants near you accept them — which is why the acceptance map matters as much as the rate.
The rate changed, and balances gained
An earlier version of the model valued diamonds ten times lower, at 1,000 diamonds to the dollar. That was revised: every balance accrued at the old rate became worth ten times more at the current one. Saying so is more useful than quietly restating the rate as though it had always been this.
Why not simply pay cash
Cash rewards for quiz answers would turn a learning and participation mechanic into a job, and a badly paid one. Redeeming for goods at local shops keeps the value inside the community and gives participating merchants footfall they would otherwise have to buy.
What it will not stretch to
Diamonds are a supplement, not an income. They will help with a shop bill; they will not pay your rent, and nothing here should be read as suggesting otherwise. Knomart's promise is access, never income.
Checking your balance
Your diamond balance is visible in Knozii, along with where it can currently be spent. Both are worth checking before you plan around a redemption.