MORE Diamond Industry Insider Terms!



Bravo.  You guys did such a good job of learning all those diamond pro expressions and phraseologies that we’re going to give you another healthy dosage to consume.  Learn these terms and continue to dazzle diamond dealers, jewelers, cutters, polishers, miners and even that small faction of highly skilled diamond thieves.

All right, class, get out your pencils.

Bruted Girdle:  This somewhat sounds like a mannish apparatus ladies might use to harness in their bulbous areas, but alas, it is not.  Somewhere along the diamond history timeline, somebody got the bright idea to scratch up the girdle portion (the thin facet line that circles the circumference of the diamond and joins the crown to the pavilion).  This trend didn’t stay popular as people typically don’t like dinged up diamonds.


Black Pique: Not to be confused as an amalgamation of the punk band “Black Flag” and the hyper-bizarre television series “Twin Peaks,” this diamond designation has similarly unsettling implications.  The term is used for inclusions in diamonds that are so stark and fugly they appear as streaks and drips of black tar within the stone.  …Ew.  Certain not to pique anyone’s interest.


Cape:  No, it’s not a form of women’s apparel that is wildly popular this season, like the ubiquitous poncho.  Cape is an informal color grade given to diamonds that have an inherently yellowish hue.  This stems from a surplus of diamonds that originated from South Africa’s Cape of Good Hope, since the 1900’s, that were as golden as a dandelion in the sun, bathing in lemonade.


Dead:  When a diamond is ‘dead,’ it’s of such low quality that it doesn’t sparkle or reflect light at all.  In fact, it devours light like an evil entity sent from Hades.  A dead diamond can only be used to propose to a Walker with.


Fire: Correct, you should not yell this in a crowded theater, like, for instance, at a “One Direction” concert in Orlando.  The phrase also applies to diamonds when conveying the way that white light is refracted (aka is reflected in crazy directions) by them.  The light is magically morphed into an actual rainbow consisting of a multitude of colored lights.  All diamonds secretly wish they had the fire of a  disco ball.

Flash Effect:  Synonymous with that traumatic experience you had at the bus stop involving that creepy man in the trench coat, the Flash Effect describes little blips of colorful light that indicate internal diamond fractures.  This also applies to the uncontrollable desire to dance on a chair while water cascades down upon you when the song “What a Feeling” plays on the radio.


Keel Line: Before keeling over, or walking the line, it’s important to understand exactly what a keel line really is.  The very bottom of most diamonds are called ‘culets’ (which are tiny flat surfaces) – but step cut and rectangular shaped diamonds have a longer “linear facet edge” at their bases, typically in the outline of an ant’s swimming pool (a small rectangle).

Leakage: Diaper and nuclear waste treatment plant quips aside, leakage is no laughing matter.  Diamonds that are poorly cut (like a kid’s hair at a blind barber’s shop) sometimes do not reflect light properly.  The light shines down into the diamond’s table (top) and then just ‘leaks’ out the bottom… Again: Ew.


Make: Yes, yes – this is how small children indicate that they have to use a restroom facility – but in the diamond world, ‘make’ is synonymous with a diamond’s cut.


Needle: Just as pointy and unappealing as the name suggests, a needle is a form of inclusion that appears sharp, skinny and penetrating.  The diamond flaw version of Taylor Swift.

Off-Make: This refers to diamonds that are cursed with sub-par symmetry and thus have an inferior cut.  Be sure not to confuse this term with “make-up diamonds” or “make-out diamonds,” or you could be in for an interesting night.

Old Mine Cut: Much like the lacerations commonly incurred by diamond miners in the 1800’s, this style of diamond cut is indeed pretty ancient.  Old Mine Cuts are able to keep a lot of the original carat weight of the rough diamond from which they are made, as the culet to table ratio is more evenly distributed than in modern cut diamonds (meaning the culet is larger and the table is smaller).  Basically, Old Mine Cut diamonds look kinda like softballs.


Pinpoint: As with a lot of the diamond vernacular out there, this phrase is about flaws (not sure why diamond industry people are so preoccupied with the negative aspects of life…).  Pinpoints are minuscule inclusions that (duh) look like little dots.  In other words, they would look fabulous on a skirt in the 1950’s, but make diamonds appear like speckled fools.

Pop: Is the transitive verb used to elucidate the physical action of removing a stone from its mounting.  Jewelers have expert ways of popping diamonds, as well as drinking soda pop, popping & locking and impersonating Poppa Smurf.


Scintillation: Similar to an extremely engaging conversationalist, a diamond’s scintillation is the dynamic way that a gem’s sparkle plays with its brilliant and shadowy interior areas.  Highlighting both the sunny and the murky, a diamond with great scintillation’s film equivalent is “Birdman.”

Step Cut: (and “Step Cut 2: Step Cut to the Street”) are types of diamond cuts found in more rectangular/square shaped diamonds (ie – emeralds).  The facets go up in little tiers, essentially creating ‘steps.’  While step cuts sound exciting (just imagine a micro-sized “Rocky” passionately running up the steps), they don’t reflect light all that well, and as a result have lost popularity (like “Step Cut  3D”).


Trillion: Once thought to be the largest number in the world, a trillion is actually any diamond that, when viewed from a bird’s eye angle, is in the shape of a triangle (three sided, for you geometry challenged individuals out there).  Possibly because its name indicates that it is very wealthy, thus leaving it susceptible to potential muggings, the trillion goes by numerous aliases, such as: Triangle, Triangular and Trilliant.  Also, it should be noted, “trilliant” is a great term for describing when something is so brilliant that it thrills you.

Well, we would like to commend you for getting through this verily difficult level of diamond terminology.  For more scintillating and educational diamond information, please visit our online college: Diamond University.  If you would like to become a trillionaire, we suggest you begin augmenting your fortune by selling your diamond jewelry.  Diamond Lighthouse ensures that you will get the most money conceivable for your diamonds.

Now pop to it.


Remember, life is what you “make” of it.

 -Joe Leone 


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