The ashes can be use to fashion diamonds, but not metal for the ring. Depending on what size and colour diamond you want, the prices vary.
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The process of turning cremated remains (ashes) into diamonds produces tiny, almost microscopic diamonds, not suitable for jewelry.
The price depends on whether you commission quantities of industrial diamonds for industrial use, or a single gem-stone quality diamond to be produced from precious ashes.
A diamond rind would cost around $160-$200
998,000,000,000
34.99
one life
$8000000
Your answer depends entirely on the diamond, its cut, carat weight, clarity and colour.
$60
Your answer depends on both the diamond and the tree. You can consider size, rarity, quality -- each categories that dictate cost.
Diamonds cost and weigh on an individual basis.
8 000 000
one life