Of course, producing these diamonds is not without cost; only when those stone beings consume coal and drink magma do they have a chance to produce them... although the probability is not low.
As for the color of the diamonds, they have slight differences due to the trace elements and varying sulfur content in the coal. However, natural diamonds themselves come with flaws, so it's not a big deal.
"...I believe that with Mr. Andes' insight, you will surely understand the intricacies within. If Mr. Andes is interested, we can run this company together. As for how to calculate the profits, we can discuss it in detail at tomorrow's banquet."
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Luo Yan believes that if Andes is interested, he will definitely seek him out and present a proposal that would delight both parties.