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How to Use a Faceting Diagram

Using a faceting diagram for precious stones can mean the difference between not knowing the importance of your stones and knowing how much your stone is actually worth. A faceting diagram refers to the cutting of the stone through detailed angles. Stone cutters use the numbers on the graph to cut the stone to the right size. Knowing how to use a faceting diagram will help you cut the perfect stone.

Instructions

- 1
  Check the name of the design. The faceting diagram lists the name of the design. Access the Rock Hounds Web site, and then click the link of the design to receive a detailed picture of the rock.
- 2
  Check the shape of the design. Listed next to the name of the design is the scientific name of the shape. For example, a "Ballgame" design is shaped like a "Square Cushion."
- 3
  Check the average length and width of the stone. The numbers are usually in inches.
- 4
  Look up the number of facets that are on the stone. Facets are classified as patches of small, polished surfaces. The amount of polish helps the sparkle refractive index or the sparkle of the stone.
- 5
  Check the refractive index (RI) of the stone. The RI is the amount of time it takes for light to pass through the stone, causing the stone to "spark." The time is usually in seconds. For example, an alcyone stone sparks in two seconds.
- 6
  Check the designer of the stone. Listed on the index is the individual who found, created and named the stone.
- 7
  Check the diagram to see where to cut the stone. At the top of the page is a detailed graph that displays numbers. Under the "Pavilion" section, locate the sequence of numbers that determine where the stone is supposed to be cut.

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