The price range for 1-carat diamonds is between $3,080 and $26,950 per carat. The price of a 1-carat diamond depends on many factors and can therefore vary greatly. More »

As of April 2015, a 2-carat diamond ring can cost anywhere from around $11,000 to as much as $97,000 or more, according to The Diamond Registry. A ring that has a 2-carat diamond is more expensive than a ring with a 1-ca... More »

Tanzanite costs between $50 and $650 per carat as of 2015. Factors determining the cost include the quality of the stone and its relative size. The quality of the final cut also affects its value. More » Beauty & Fashion Jewelry & Watches Precious Metals & Gems

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 »

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 »

A system developed by the Gemological Institute of America in the 1950s that grades diamonds by color, clarity, cut and carat weight determines a diamond's price. The value is affected by the quality and rarity of the fo... More »

As of 2014, selling prices for commercial uncut diamonds are estimated to be around $1,850 per carat. Fine rough diamonds sell for more than $2,400 per carat. More »