Diamond Table Education

The table of a diamond refers to the flat facet on the top surface of the gemstone, and it is the largest facet on a diamond. This guide will discuss its importance, how it affects a diamond's appearance, and its role in the grading process.

Importance of the Diamond Table

The table is crucial for a diamond's appearance for several reasons:

1. Light Reflection: A significant portion of light that enters and exits a diamond does so through its table. The size and angle of the table can greatly influence a diamond's brilliance and fire.
2. Perceived Size: A larger table can make the diamond appear bigger than another diamond of the same carat weight with a smaller table.

Table Percentage

Table percentage is a key metric used to evaluate a diamond. It is calculated as:

Table Percentage=(Table DiameterDiamond Diameter)×100Table Percentage=(Diamond DiameterTable Diameter​)×100

The ideal table percentage can vary based on the shape of the diamond and personal preferences, but for round brilliant diamonds, it typically ranges from 53% to 60%.

How the Diamond Table Affects Appearance

Brilliance

The table's size affects how light refracts within the diamond. A well-proportioned table allows for optimal light reflection, maximizing the diamond's brilliance.

Fire and Scintillation

A diamond's fire (color dispersion) and scintillation (sparkling effect) are also influenced by table size. An appropriately sized table ensures that light disperses adequately, showing more colors and sparkle.

Symmetry

The alignment of the table with other facets is vital for the overall symmetry of the diamond, influencing its beauty and value.

Relation to Other Facets

The table's size and angle are interconnected with other facets, especially the crown (the section between the table and the girdle) and the pavilion (the section below the girdle). Proper proportions between these facets are crucial for the diamond's overall performance.

Table in Diamond Grading

Professional grading entities like the GIA (Gemological Institute of America) and AGS (American Gem Society) consider table size as a critical factor when determining the cut grade of a diamond. It's assessed in conjunction with depth, girdle thickness, culet size, and other metrics.

Common Table Imperfections

Table Scratches

These are fine lines on the table surface, often resulting from wear or rough handling.

Table Chips

Tiny chunks missing from the table, usually caused by hitting the diamond against a hard surface.

Naturals on the Table

Original rough diamond surface remnants that were not polished off.

Buying Tips

1. Proportions: Seek a diamond with a table percentage that aligns with industry standards for the diamond's shape.
2. Clarity: The table is where inclusions and imperfections can be most apparent, so ensure it's clean to the naked eye or as per your preference.
3. Expert Opinion: Always get a second opinion from a trusted jeweller or gemologist when considering table proportions and quality.

Understanding the importance of a diamond's table is crucial for anyone looking to purchase, grade, or appreciate diamonds. It plays a pivotal role in the appearance, performance, and valuation of the gemstone. Whether you're a seasoned jeweller or a first-time buyer, knowledge about the diamond table is essential in making informed decisions.