DiamondonNet Dictionary
DiamondonNet dictionary of common loose diamonds and diamond jewelry terms in the industry and their meanings.
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The ROUND diamond is today's most popular diamond shape. All other diamond other than round are referred to as "fancy-shaped" diamonds. Since these shapes are all different, unique characteristics determine quality. Below are some learning tools to help you recognize the best fancy shaped diamond shapes. Personal preference of course is the most determining factor for choosing a shape of your choice for your diamond jewelry

ROUND CUT diamonds consists of 57 facets (58 with a culet) and displays the most fire and scintillation of all the cuts. A property why round shape diamonds are popular for diamond jewelry such as engagement rings and wedding bands.

The PRINCESS CUT diamond is a square cut diamond with 90 degree angles on each corner. It has a tremendous amount of brilliance, second only to rounds. Princess cut diamonds have become increasingly popular within the past few years. The princess cut can vary greatly in how square or rectangular they are. For a square shape, look for a length to width ratio between 1.00 and 1.10. For a rectangle, look for a ratio between 1.50 and 2.00. Table should be between 65-80% and the depth between 65-75%.

EMERALD CUT can be rectangular or square in shape and have beveled corners and step-cut facets. This shape really shows off the clarity of a diamond and can vary in the rectangularity. The length to width ratio will allow you to find the shape you are looking for. For a traditional emerald cut, look for a length to width ratio between 1.30 and 1.40. For a pleasant looking emerald cut diamond, the table should measure between 60-75% and depth between 53-70%.

ASSCHER CUT diamonds, often called the square emerald cut, has cropped corners and was designed in 1902 by the Asscher Brothers of Holland. The length to width ratio should be between 1.00 and 1.05. The table and depth percentage should measure the same as an emerald, between 60 - 75% and 53 - 70% respectively.

An OVAL DIAMOND has stunning brilliance, due in large part to its facets, which are similar to those in a round diamond. The length can accentuate long, slender fingers. It was invented in the early 1960’s. For an eye catching and beautiful oval diamond, the length to width ratio should be between 1.33 and 1.66. In this case, the table should measure between 53 - 62% and depth between 60 - 70%.

The DIAMOND MARQUISE cut is elongated with pointed ends. It was inspired by the smile of the Marquise de Pompadour and created for France's Louis XIV, who wanted a diamond to match it. The length of the marquise can also make fingers appear longer and more slender. When looking for a marquise shaped diamond, the length to width ratio should be between 1.50 and 2.25 and table and depth percentages between 53 - 60% and 50 - 65% respectively.

The PEAR SHAPED diamond is a combination of oval and marquise cuts. The sparkling teardrop has good proportions and refracts the light well. This Pear Shaped Diamond looks best set as a pendant or pair of pear diamond earrings. For a pear shape, the length to width ratio should be between 1.40 and 1.75. The table percentage should measure 53 - 60% and depth percentage 50 - 65%.


The RADIANT CUT diamond is cut in the shape of a rectangle with rounded corners. Radiant cut diamonds facets are cut into a pattern that gives this diamond the unique appearance of cracked ice. Radiant cut diamonds can vary in their degree of rectangularity. For a square radiant, look for a length to width ratio between 1.00 and 1.10. For a rectangular radiant, the length to width ratio should be between 1.50 and 2.00. Regardless of how rectangular the radiant is, the table should be between 65 - 80% and depth between 65 - 75%.

The HEART SHAPED diamond may be hard to find, but it is considered the most sentimental of all the diamond shapes. It is important to find a heart diamond with even lobes and a well-defined outline. Because its shape is very close to that of a round, it has beautiful brilliance. The length to width ratio for a well-proportioned heart-shaped diamond is between 0.90 - 1.10. The depth of a heart-shaped diamond should be between 50 - 63% and the table between 53 - 65%.

The CUSHION CUT diamond is an antique cut and is also referred to as Pillow cut or the Candlelight diamond. Cushion cut diamonds have larger facets and rounded corners than most cuts so as to increase their sparkle under candlelight.

The TRIANGLE DIAMOND, first designed in Amsterdam, is cut into the shape of a wedge. The corners of the triangle cut diamonds may be pointed or rounded and the body will vary depending on the stone’s characteristics and the cutter’s preference.

Exactness of the diamonds outline, and the shape, placement and alignment of its facets.
Sapphire refers to gem varieties of the mineral corundum, an aluminum oxide (Al2O3), when it is a color other than red. It can be found naturally or manufactured in large crystal boules for varied applications, including infrared optical components, watch faces, high-durability windows, and wafers for the deposition of semiconductors such as GaN nanorods.

The mineral corundum consists of pure aluminum oxide. Trace amounts of other elements such as iron, titanium and chromium give corundum their blue, yellow, pink, purple, orange or greenish color. Sapphire includes any gemstone quality varieties of the mineral corundum except the fully saturated red variety, which is instead known as ruby, and the pinkish-orange variety known as padparadscha.

Although blue is considered the normal color for sapphires, they can be found across a full range of spectral colors as well as brown, colorless, grey and black. Those other than blue in color are considered fancy color sapphires. Some natural sapphires can be found as completely transparent, or "white." White sapphires usually come out of the ground as light grey or brown and are then heated to make them clear. However, in very rare circumstances they will be found in a clear state..
Screw Back
A threaded post and screw used as the back setting for earrings. Screw backs are chosen as setting to secure more expensive earrings by holding them more securely in place. The lock is harder to take off because you have to rotate it many times.
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