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2007-04-13 06:03:25 · 10 answers · asked by stefan_sturdy 1 in Science & Mathematics Earth Sciences & Geology

10 answers

Marking

Marking is done after examining each rough diamond to decide how it should be cut to yield the greatest value. To make this decision, the shape of the rough diamond and the number and location of imperfections must be considered. Of utmost importance is the determination of the direction of the cleavage, or grain, in the diamond crystal (because of its atomic structure, diamond can be cleaved in four directions parallel to the octahedron crystal faces). Taking these factors into account, the planner decides how the diamond should be cut and marks it to indicate where the stone should be cleaved or sawed.

Cleaving

If the planner's decision is to cleave the stone, it then goes to the cleaver. Large diamonds are often preshaped by cleaving into pieces suitable for sawing. When the stone is very large and valuable, the cleaving is a most critical process, because a mistake by the planner or the cleaver can shatter the stone. The cleaver cuts a groove along the line showing where the stone is to be cleaved, using another diamond as a cutting tool. He mounts the diamond in a holder called a dop and inserts a steel wedgeinto the groove. He strikes the wedge sharply with a mallet and the diamond splits along its cleavage.

Sawing

The third step, or the second step if cleaving is unnecessary, in the diamond-cutting process is sawing. The saw is a paper-thin disk of phosphor bronze, rotated on a horizontal spindle at about 4,000 revolutions per minute. The sawyer mounts the diamond in a dop and clamps it so that it rests on top of the blade. The rim of the saw is charged with diamond dust, and, as the sawing progresses, the blade continues to recharge itself with diamond from the crystal being cut. The saw will cut through a 1-carat rough diamond in four to eight hours, unless it strikes a knot, in which case it may take much longer.

Girdling

The next step in cutting a round stone is called girdling (rounding; bruting). The diamond to be girdled is placed in the chuck of a lathe; while it spins, a second diamond mounted in a dop on the end of a long handle is held against it, and the diamond is slowly rounded into a cone shape.

Faceting

From the girdler the diamond goes to the lapper, or blocker, who specializes in placing the first 18 main facets on a brilliant-cut diamond. It then goes to the brillianteer, the worker who places and polishes the remaining 40 facets, if the stone is being cut in the standard 58-facet brilliant cut.

Placing and polishing are done by setting the stone either in a lead dop or a mechanical clamp and holding it down on a revolving cast-iron lap (horizontal, circular disk) that has been charged with diamond dust. Great skill is necessary at every stage, but especially during faceting, because the angles of the facets must be exact in order to yield maximum brilliancy, and their sizes must be accurately regulated to preserve symmetry.

The most popular style of cut is the brilliant cut, a round stone with 58 facets. A single cut is a simple form of cutting a round diamond with only 18 facets. Any style of diamond cutting other than the round brilliant or single cuts is called a fancy cut, or fancy shape; important fancy cuts include the marquise, emerald, oval, baguette, heart shape, pear shape, kite, triangle, and trilliant. The term melee is used to describe smaller brilliant-cut diamonds as well as all small diamonds that are used in embellishing mountings for larger gems.

2007-04-16 00:22:50 · answer #1 · answered by Anonymous · 0 0

I am not sure how a diamod would be cut, but you would need a diamond to cut through another diamond.

2007-04-13 08:23:31 · answer #2 · answered by Mark F 5 · 0 0

Diamonds are cut using diamond impregnated copper discs. The disc are mounted on a cutting device which spins at a very high speed, the diamond to be cut is mounted in a holder and rested onto the spinning disc. it takes a long time to do one cut on a diamond, and each one is done by a different person each time.
Try typing in the address for Rand Diamond mines in South Africa, there may be more info there and better explained than i just tried lol.

2007-04-13 06:13:05 · answer #3 · answered by ALUN J 1 · 1 0

Here are some ideals for you hun...... Go for a walk or run, take a hot or cold shower (make sure there is nothing sharp in the shower), Play your music loud, Yell sream or cry, forces on your presence in the room, pound on your bed until you get tried, make a list of postives reasons why you want to get better, write a list of affirmations, you could call the crisis line they are helpful. But the one that works for me to get a red marker and take the marker like i'm cutting it is very helpful. Good luck hun, if you need more just e-mail I will tell you them. Take care. I hope this helped you.

2016-05-19 16:56:49 · answer #4 · answered by ? 3 · 0 0

wots a diamod


Industrial use of diamonds has historically been associated with their hardness; this property makes diamond the ideal material for cutting and grinding tools. As the hardest known naturally occurring material, diamond can be used to polish, cut, or wear away any material, including other diamonds. Common industrial adaptations of this ability include diamond-tipped drill bits and saws, or use of diamond powder as an abrasive. Industrial-grade diamonds are either unsuitable for use as gems or synthetically produced, which lowers their value and makes their use economically feasible. Industrial applications, especially as drill bits and engraving tools, also date to ancient times

2007-04-13 06:07:03 · answer #5 · answered by dave n kez 4 · 2 1

You can't cut a diamond unless you find something harder than it. And the problem is that a diamond is the hardest rock in the world.

2007-04-14 04:33:10 · answer #6 · answered by Freshie 1 · 0 0

Usually with another diamond but you have to hit it with a certain alignment to the crystal structure to get it to cleave (split).

2007-04-13 06:06:38 · answer #7 · answered by Gene 7 · 3 1

it is apparantly the hardest substance on earth but any1 could break it wit a hammer

2007-04-13 12:57:39 · answer #8 · answered by killiancarroll 2 · 0 0

you cut a diamond with special cutters made of diamond itself

2007-04-13 06:07:15 · answer #9 · answered by rohan c 1 · 1 1

with highly powerful lasers

2007-04-13 06:06:56 · answer #10 · answered by KandyMan 3 · 1 2

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