Naturally black diamonds are extremely rare and can have a very high value, depending on the cut, color, clarity and carat size of the diamond. The most accurate way to learn the value of a black diamond is to have it ap... More »

Real diamonds are more transparent and efficient at conducting heat than moissanite and cubic zirconia stones. Under magnification, real diamonds refract differently than their fake counterparts and have minute physical ... More »

www.reference.com Beauty & Fashion Jewelry & Watches Precious Metals & Gems

To determine if a diamond is real, test it with a diamond testing device that also tests for electrical conductivity within a stone. You can also place the stone over printed text as diamonds refract too much light to al... More »

To determine the value of a diamond, note its color, clarity, cut and carat. Diamonds are more valuable when they have less color, lack spots and imperfections, have higher cut grades and weigh more. Compare each of thes... More »

Determining the quality of a diamond involves the consideration of its cut, clarity, color, carat size and certification. Certification through an accredited organization, such as the American Gem Society or the Gemologi... More »

As with other gems, the value per carat of tanzanite is influenced by color, cut and clarity. Other factors jewelers use to grade tanzanite include shape and polish. More »

www.reference.com Beauty & Fashion Jewelry & Watches Precious Metals & Gems

Four aspects of gemstone grading determine the per-carat value of a ruby, including color, clarity, cut and carat. Quality of a top-grade ruby means it has rare features, rather than being labelled as better than another... More »