For diamonds, the weight of a carat is equivalent to 200 milligrams. You can complete the math.
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The stone weights 545.67 carats.
One point eight carats.
Carats measure the weight of the diamond, regardless of its cut. A trustworthy gemologist will remove the stone from its setting, weigh it, and remount it, for a fee.
The raw diamond of 19.5 carats weighs about 3900 milligrams. Remember, though that raw, gem-quality diamonds can lose about 60% of their weight when cut and polished.
You can buy a four-carat diamond today on Blue Nile and spend from US$30,000 and US$43,000. It will weigh about four carats depending on which one you choose.