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Rough Diamond Buying Advices

It is very important to buy a precious stone by daylight, on a fine weather day and with a northern exposure. It is under these conditions that the true color of the stone will appear.

Put rough diamond inside a diamond colortest grader, press slightly on the paperboard and examine the color of diamond under a daylight lamp.

If you wish to buy rough diamonds in order to cut them and resell them cut, there is a risk during the cutting: diamond can break because of a bad handling or an internal stress which would not have been detected. Your investment would then be lost entirely.

If you buy for the first time, it is preferable to test diamond with a diamond tester to make sure that you are really in the presence of a diamond and not a simulant.

Our rough diamond prices (simulator and lists) can help you for your purchases. You can calculate the puchase price of a rough diamond according to its crystalline shape, its weight, its clarity and its color. Print the sheets of rough diamond prices. For more informations about our rough diamond prices subscription, please click: Rough Diamond Prices.

Beware of salesperson who will say that the color of a rough diamond that they are try to sell will clear up during cutting, it is not an absolute rule.

If you wish to buy rough diamonds for cutting and reselling them cut, choose the cutter with caution. Indeed a diamond can be easily exchanged with another of lower quality.

Analyze the rough diamond in order to determine precisely it's weight after polishing. Rough shape, inclusions, crystallizations deformations, internal stress must be observed attentively before any purchase:

1 carat rough diamond, sawn, very good shape, will lose 48% of its weight, meaning that after cutting it will be only 0.52 carat polished diamond.

1 carat rough diamond, sawn, good shape, will lose 57% of its weight, meaning that after cutting it will be only 0.43 carat polished diamond.

1 carat rough diamond, sawn, bad shape, will lose 65% of its weight, meaning that after cutting it will be only 0.35 carat polished diamond.

1 carat rough diamond, no sawn, very good shape, will lose 53% of its weight, meaning that after cutting it will be only 0.47 carat polished diamond.

1 carat rough diamond, no sawn, good shape, will lose 58% of its weight, meaning that after cutting it will be only 0.42 carat polished diamond.

1 carat rough diamond, no sawn, bad shape, will lose 67% of its weight, meaning that after cutting it will be only 0.33 carat carat polished diamond.

When buying a diamond, always have your own material and tools: loupe 10 X, diamond tester, scale, polariscope, etc... To buy these tools, click: Gemology Tools for Rough Diamond.

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