How to buy a Diamond - As with most things the basic rule applies in the end "is it worth it to you." But there are other things that can help
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The bit about looking at the stone in shadow from a distance works for all faceted stones. No training needed. For colored stones you should also be able to see the color.
That said, some faceted color stones are cloudy and don't have much sparkle to them, in that case you should still clearly the color. Rubies/emeralds are good examples. The good stones are pretty expensive and clear emeralds are Very Rare, so usually you see cloudier stones. Then the color takes precedence.
Example, the 'best' sapphires are considered to be from a mine that only was worked for 9 years in the Kashmir, the very vivid blue with a soft silky veil makes the stone almost glow blue. But they don't tend to sparkle.
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That said, some faceted color stones are cloudy and don't have much sparkle to them, in that case you should still clearly the color. Rubies/emeralds are good examples. The good stones are pretty expensive and clear emeralds are Very Rare, so usually you see cloudier stones. Then the color takes precedence.
Example, the 'best' sapphires are considered to be from a mine that only was worked for 9 years in the Kashmir, the very vivid blue with a soft silky veil makes the stone almost glow blue. But they don't tend to sparkle.
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