Diamond is the hardest naturally formed mineral found on earth. It is used not only for making expensive and beautiful jewelry but also for making drilling equipments. Since diamonds are very hard, they are ideal for making cutting and grinding equipments. Diamonds can be used to cut, drill, grind and polish. Thus it is greatly used in various industrial applications. Some of the common equipments used are the diamond tipped drill bit and the saw blades. Diamond powder is used as an abrasive in industries. The diamonds used for these purposes are of lesser quality and are called ‘bort’. Thus, there are two grades of diamonds – the gem grade diamond and the industrial grade diamond. The industrial grade diamonds should be hard and have heat conductivity.The demand for diamonds is greater than the supply, so the diamond drill is very expensive. Although, there are a number of types of drills, the diamond drill is a very essential piece of equipment in an industry that needs to do a lot of drilling. The diamond drill is actually a drill with the diamond drill bit attached to the end of hollow drill rods. The diamonds used are fine to micro fine diamonds. To keep the sharpness and hardness of the diamond drill, it is necessary to give it sufficient lubrication and cooling. The holes made are very clean and giving the best results. The drilling has to be done slowly so that the life of the drill bits can be extended for a longer period of time. Drilling is a laborious process. It is also a tiring and demanding task and uses up a lot of physical energy. But, it needs to be done. The diamonds drills can make holes in any type of substance, right from a soft one to a hard one. It includes bricks, metals, concrete and any other material without giving out much noise. The holes can be made quickly without any vibrations and much effort, since the drill is made of hard diamond. The diamond drilling equipments are long lasting and penetrate fast to drill a hole.The diamond drilling equipments are used in all kinds of industrial applications. We are generally not aware of it many uses. They are used by the construction industry for making holes in bricks, concrete and iron. It is used in the mining industry to drill holes at places where there are mines. Wherever holes have to be made for placing cables, where anchoring bolts have to be placed and also where load carrying machines have to be installed, the diamond drilling equipments are used.There are two types of drilling techniques. The dry drilling technique is used when concrete, hard surfaces, pavements, bricks or any hard surface has to be drilled. The wet drilling technique is used when the place that has to be drilled is fully under water. The diamond drilling equipments are of different types. Synthetic diamonds are used in the impregnated bit’s matrix series. The matrix layer has the diamonds in a powdered metal bond. They have a long life and also penetrate fast. They are used in many forms of drilling. Surface set diamond bits have a single natural diamond layer. They have a hard matrix compound on the face of the bit. They are used while drilling soft to medium hard surfaces.Diamond reaming shell has natural or synthetic diamonds. It is used to attach the drill bit to the core barrel. The main work of the reaming shell to make a hole that is exact in diameter for the core barrel to go through, having enough space for a new drill bit, when the old one has to be changed. Long diamond reaming shells are also available for drilling purposes.Diamond core bits are thing walled core bits that are used in a large number of applications. They are used to drill holes in are concrete, glass, ceramics and also in all kinds of pipes used in electricity, drainage etc. Wet cut drill core bits and dry cut drill core bits are available for various purposes.Synthetic diamond polycrystalline is also used in making drilling equipments. They are used in making drill bits, reaming shells, saw blades etc. Polycrystalline diamond pads or cutters (PDC) are placed in rows of polycrystalline diamonds kept on tungsten carbide substrate on the bit face, to drill holes in areas that are too sticky or soft. You have PDC core bits and PDC drill bits which are cost effective and very useful in drilling and cutting activities. The diamond drilling equipments are no doubt expensive, but they are very effective in making clean holes that are necessary for all construction, mining and power, drainage, gas lines purposes. We should check out the various companies that manufacture these equipments, obtain details about the equipments and the price and then order the equipment that we need. The internet would be the best place to gather all the information.
A diamond acts like a prism whereby light can be divided into a spectrum of colours.* A colourless diamond, allows more light to pass through it than a coloured diamond, these colourless diamonds reflect the light as colourful flashes called ‘fire’. The less colour in a diamond the more colourful the fire and hence the better the diamond grade.
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Diamond Colour
A diamond acts like a prism whereby light can be divided into a spectrum of colours.
A colourless diamond, allows more light to pass through it than a coloured diamond, these colourless diamonds reflect the light as colourful flashes called ‘fire’.
The less colour in a diamond the more colourful the fire and hence the better the diamond grade.
Colour in a diamond acts as a filter and reduces the range of colour exuded.
The perfect diamond is actually colourless.
The less colour (yellow) a diamond permeates the more rare and valuable it actually is.
A letter grade is given to a diamond to describe the subtle tones of colour in the stone.
D is perfectly colourless and therefore the most rare and expensive.
As you progress from D to Z on the alphabet colour scale, the level of colour increases with traces of a yellowish or brownish colour.
Vibrant colours such as pink, red, blue and green are constantly being discovered, but due to their rarity are incredibly expensive.
These colours do not follow the normal colour scale and are categorised separately.
At GoldeNet Australia you will only find the finest diamonds, therefore we do not offer diamonds that have been graded below M.
Which Colour Grade Should I Choose? Diamonds graded D through F are naturally the most valuable and desirable because of their rarity. The rarity and value of these diamonds are reflected in their price.
This does not mean that diamonds graded below F are not considered to be very attractive.
Diamonds graded G through I show virtually no colour visible to the untrained eye.
Diamonds graded J through M show an extremely faint trace of yellow, however this faint hint of colour can be minimised by the careful selection of the right jewellery setting on which to mount your diamond.
D, E, F = For the purest diamond, diamonds graded D-F are superb diamonds and are extremely expensive.
G, H, I, J = For excellent value in a diamond with no noticeable colour to the untrained eye.
Nearly colourless diamonds with noticeable colour when compared to higher grade diamonds. These are high quality and are excellent value.
K, L, M = Faint yellow diamonds.
N, O, P, Q, R = Very light yellow diamonds.
GoldeNet Australia does not offer these diamonds.
S, T, U, V, W, X, Y, Z = Light yellow diamonds. GoldeNet Australia does not offer these diamonds.
Diamond Cut
The cut of a diamond is one of the most important diamond characteristic as it provides the diamond with its unique sparkle and brilliance as the cut allows the maximum amount of light to enter and leave the diamond.
Of the Four Cs, the cut is the only value factor that is a result of human skill.
It refers to the angles and proportion of a diamond, as well as its polish and precision of faceting. Often the cut of a diamond is mistakenly referred to as the shape (round, pear, oval, etc.) of the stone.
Well-cut diamonds can reflect light like a mirror from one facet to another and disperse and reflect this light through the top of the stone.
A well-cut diamond will be symmetrically round, proper depth and width and have uniformity of the facets.
These features will result in optimal radiance.
On a classic round brilliant-cut diamond, for example, 57 or 58 facets must be precisely aligned so light will enter the diamond and reflect back through the large top facet, or table of the diamond. Diamonds that are cut either too deep or too shallow can lose light through the sides and bottom and will be less brilliant, and ultimately of less value.
The universal cut grading scale, as defined by the American Gemologist Society Laboratories (AGSL), is outlined below. Currently, only round diamonds are graded.
GoldeNet Australia does not carry any diamonds below the cut grade of ‘Good’.
IDEAL CUT: Represents roughly the top 3% of diamond quality based on cut.
Perfectly proportioned with the highest grade of polish and symmetry.
This grade of diamond reflects virtually all light that enters it.
They are the most brilliant, rare and expensive diamonds.
EXCELLENT CUT: Represents roughly the top 8% of diamond quality based on cut.
Proportioned to fit strict requirements for table and depth percentage.
This grade of diamond reflects almost all light but less than the ideal cut.
They are still quite rare and very expensive.
VERY GOOD CUT: Represents roughly the top 15% of diamond quality based on cut.
Proportioned to reflect much of the light that enters.
This is a high quality and moderately priced diamond.
GOOD CUT: Represents roughly the top 25% of diamond quality based on cut.
Proportioned to reflect most light that enters.
These are considerable value, quality diamonds.
FAIR CUT: Represents roughly the top 35% of diamond quality based on cut.
Disproportioned but allows some light to be reflected.
POOR CUT: This includes all diamonds that do not meet the proportion standards of a fair cut. Disproportioned so that most light entering is lost out of its sides and bottom.
Important characteristics of a diamond cut are described below. Some diamond cutters will compromise on the cut of the diamond in an attempt to optimise the diamond’s weight (carat).
This can result is a larger diamond with a duller appearance.
If all Cs are equal (cut, carat, colour and clarity), there can be as much as a 50% variation in the cost of a diamond if the cut is of poor quality.
TABLE SIZE %: The table length relative to the diameter of the diamond.
A table that is too large or too small will reduce the overall dispersion of a diamonds brilliance.
CROWN ANGLE: Angle between bezel facets and girdle.
Crown % is a measurement that relates to the depth of the crown to the diamonds overall depth.
GIRDLE THICKNESS: Ranges from extremely thin to extremely thick (assessed visually).
Extremely thin or extremely thick girdles are less desirable than more moderate girdles.
DEPTH %: Measurement of the distance from the table to the culet (bottom-most point). A depth that is too shallow or too deep will allow light to escape through the bottom of the stone, reducing the stones overall fire and brilliance. CULET SIZE: Ranges from pointed to extremely large (assessed visually). Unless the culet is abnormally large, it generally has no impact on the value of a diamond.
SYMMETRY: Refers to the overall uniformity of the cut of a diamond and is graded poor to excellent.
Symmetry is based on the diamonds proportions, the relation of one facet to another. A diamond with good symmetry can be more attractive than a less symmetrical stone.
Stones with poor symmetry can actually appear off-centred.
POLISH: The overall quality and uniformity of the polish of a diamond. It is graded poor to excellent based on the final finish applied to the facets and facet junctures by the cutter. Well-polished diamonds permit maximum passage of light and prevent potentially streaky surfaces.