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Diamond Terms T

~ Diamond Terminology from A to Z ~

There are thousands of terms being used in today's jewelry industry. Some common knowledge, others are obscure and baffling. We've created a database of terminology from A to Z to make it easy, and of course if you still have questions, please do not hesitate to send us an email or give us a call.



When you look at the diamond. The very top flat surface of the diamond or gemstone is called the table.

Table Percentage

When measuring a diamond it's good to have a electronic mm reader. If you do just place the diamond in there and measure how far across the table width is and divide it by the width of the girdle. Which is the center fat part of the diamond.


The overall feel of the diamond color. From the brightest of whites to the darkest of blacks. Basically just how dark or light a stone is.


It's just as it sounds. Let's say you design your own engagement ring band, the designer would take your drawing and create a template, or pattern, and trace it, cut it, sand it, then polish it.

Tennis Bracelet

A bracelet containing many small gems, usually diamonds, linked together in a narrow chain.

Three Stone Ring

Also called the Past, Present, Future ring. Three Stone Rings take 3 gems, usually diamonds and places them each in their own mounting/head. Usually the center gem or diamond is the largest with the two other diamonds/gems on the each side of it.

Top Wesselton

When you hear this phrase people are referring to the F-G color of the diamond color chart. F is also sometimes referred to as Wesselton+.


A precious stone, typically colorless, yellow, or pale blue, consisting of a fluorine-containing aluminum silicate.

Total Depth Percentage

Take the diamond and measure it length wise from top to the bottom of the culet. Than take the average of the width of the table. In other words measure both ways of the table and divide by two. Usually the more closer to 60% the better.

Treated Diamond

This can mean any number of things, but they all correspond to the enhancement of the diamond. There are a few ways to permanently change the color of diamond. One way is by high heat and pressure. The other way is to treat the clarity of diamond. This can be done with polishes, drillings, laser drilling, ejecting glass like substances into the diamond, laser burning of carbon spots, and so forth. In most cases a treated diamond will come out much better looking than what it started out as, and is commonly being used all across the world to enhance substandard clarity diamonds. All of it is legal as long as you make sure the purchaser knows about it. When it comes to cleaning a treated diamond you have to take a few additional precautions and steps other wise the clarity enhancement will actually come out. However if you have a heat treated diamond to change the color, the color enhancement is permanent.

Trillion cut

f you've ever seen a diamond shaped like a triangle, than you've seen a trillion cut.


A semiprecious stone, typically opaque and of a greenish-blue or sky blue color, consisting of a hydrated hydroxyl phosphate of copper and aluminum

Twinning Wisp

There a few variations to this term, however best put, it's when two crystals inside the diamond form exactly the same as the other one next to it, or overlapping it causing a cloudy appearance. It's best when all crystals are different.