Copper, Bronze, Silver, Gold, Platinum. What are all of the metals/gems that are worth more than Platinum, cost-per-ounce-wise?
by 
Egao No Genki
ANSWERS: 2
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I am quite sure that Osmium, Iridium and maybe Rhodiun are more expensive (precious) than Platinum. The reason due to their rarity and concerns of their technological enrichment and purification. Engelhart Industries maybe able to verify this with numbers.
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Prices for platinum group metals fluctuate heavily depending on their industrial applications. Right now, rhodium is at $6000/oz, much higher than the $1300/oz platinum commands. A good example of the heavy fluctuation is ruthenium, another platinum group metal. The price of this metal spiked from $100/oz in 2006 to over $800 in 2007 when hard disk manufacturers used a new technique to make super high density hard disk drives that requires significantly more ruthenium. For prices (including historical prices) of precious metals, you can go here: http://www.ebullionguide.com/price-chart-platinum-last-30-days.aspx
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