AfricaGems Certified Natural Black Opal - Oval Cut - 4.57 carats - 13.1 x 11.4mm

In gemstones and diamonds, the Price Per Carat refers to the dollar cost per unit of carats, the traditional unit of measurement for gemstones. 1 carat equals 0.2 grams. The price per carat is the best way to compare very similar gemstones in terms of quality. The higher price per carat reflects a higher quality gem.

This gemstone has a Very Good Make as graded by a professional gemologist. It has been crafted with the highest degree of craftsmanship, with very good proportions, symmetry and polish. It has been cut with little regard to the weight loss of the gemstone rough, and primarily to optimize the gemstones optical properties to its fullest potential.

This gemstone has Very Good Symmetry as graded by a professional gemologist and any symmetry flaws are extremely difficult to detect under 10x magnification. Gemstones with at least a Very Good symmetry and Make grade will display superior brilliance. The symmetry grade refers to alignment of the facets, poorly shaped facets or the presence of extra facets.

AfricaGems 'This gemstone is sold with a Gemstone Grading Analysis issued by AfricaGems' GIA 'This gemstone is sold with a gemological certificate done by the GIA (Gemological Institute of America) gemological laboratory.' GRS 'This gemstone is sold with a gemological certificate done by the GRS (Gem Research Swiss Lab)Gem Research Swiss Laboratory) gemological laboratory.' AGTA 'This gemstone is sold with a gemological certificate done by the AGTA (American Gem Trade Association) gemological laboratory.' GIT 'This gemstone is sold with a gemological certificate done by the GIT (Gem and Jewelry Institute of Thailand)gemological laboratory.'

This gemstone was graded Eye Clean by a professional gemologist. Type I and Type II gemstones such as Aquamarine, Tanzanite, Yellow Chrysoberyl, most Tourmalines, Yellow Topaz Alexandrite, Peridot, Spessartites, Rhodolite, Ruby, Sapphire, Spinel, and Tsavorite, inclusions will not be visible with the naked eye. This gemstone will display superior brilliance. <br>Type III gemstones such as Emerald, might show some slight eye visible inclusions with an Eye Clean clarity grade. This emerald will display superior brilliance compared to lower clarity grades.

Dimensions are used to describe the size of a gemstone measured in millimeters. The measurements are described first by length, then by width and finally by the depth of the gemstone.