Industrial grade diamonds are disposable, since they do wear out -- slowly -- but they do wear.
According to the 2003 publication by Donald Olsen, et al (link, below):
"Natural industrial diamond...price varies from about $0.30 per carat for bort-size material to about $7 to $10 per carat for most stones, with some larger stones selling for up to $200 per carat."
Industrial, or commercial-grade, carpet is carpet that can be glued directly to the floor. It may also be laid on 1/4 inch thick, 8 pound padding. This carpet is often made of polypropylene.
Diamond is the hardest mineral known, so industries employ diamonds to enhance cutting and precision tools.
Seventy-five percent of diamonds that are mined are used in industry. These diamonds are not gem-quality stones, and appear cloudy, even milky because of their flaws and inclusions. 'Black diamonds', properly Carbonado, are gem-quality stones. You can read more, below, and depending on whether you want to employ your 'black industrial diamond' as a gem stone or as an industrial tool, you can pay accordingly.
It is industrial
Industrial Engineering is a extended branch of Mechanical engineering but now stands a separate entity. It involves work study, method study, time study, optimization techniques, value engineering. It focuses on improving the way a work or job is done. If one wants to improve an activity, optimize an activity either by man or machine, Industrial Engineering tools offer solution.
A diamond is worth whatever someone will pay you for it. Depends on the diamond. A diamond's value is determined by carat, color, cut and clarity. There are many grades of diamonds from industrial grade to Flawless, gem quality.
Gem-quality diamonds are transparent. Industrial-grade stones, not so much.
The Diamond III's are selling from $900 to $1360
Given that you can purchase ultra-high-quality gem stone grade diamonds for millions of dollars US per carat or industrial-grade diamonds by the pound for a few dollars, there is a very broad range of the value of the mineral diamond. A gem-quality diamond is worth whatever someone will pay you for it. If you have one for sale, best practices dictate that you take the diamond to a certified gemologist and pay for an evaluation as to the diamond's cut, colour, carat weight and clarity. This will help you establish a fair market price you can ask for the diamond. On the other hand, you can buy industrial-grade diamonds by the pound for a few dollars -- if you buy in bulk.
Diamond of 2 carats (jewelry grade) can be worth 1,000 to 20,000 dollars more or less. Industrial grade diamonds: From experience, about 25 years ago I saw a 40 carat industrial grade diamond valued at $4,000, $100 dollars a carat. It looked like a dirty piece of quartz.
Your answer depends on why you are buying diamonds. As an investment, you can educate yourself as to the four Cs of diamond value: cut, clarity, colour and carat weight, and then buy the highest grade diamond with the heaviest carat weight that you can afford. As bling, you can forego everything above except carat weight and understand that the diamond is not an investment grade gem-stone and may not sell for as much as you paid for it. As industrial hardner, you can look for the size, grade and quantity that you want to buy.
Seventy-five percent of all diamonds mined are useful only as industrial-grade diamonds. This means that all diamond mines contain significant amounts of industrial diamonds. Until all the diamonds are mined and the mines closed, it's not possible to tell which mine has produced the most amount of industrial diamonds.
Second hand in v.good condition £650.
A diamond's value is a result of several factors, especially: carat weight, shape, color grade, cut quality, clarity, and which gemological laboratory did the certification. Also, the "value" is different for a diamond dealer (who bases the value on the weekly Rapaport report), a diamond retailer (who adds in costs for the business's overhead), and someone interested in wearing or gifting the diamond (who needs to account for emotional value). For an estimate of a diamond's retail value, plug its characteristics into a diamond search engine, which can show the retail prices at a dozen different retailers side-by-side.
IMP is a clarity value used by some gemologists who grade diamonds. It is not used by the Gemological Institute of America.
on industrial street
All diamonds are mined, and about 80% of these are industrial diamonds. They are separated from gem-quality diamonds through the milling process which uses running water, and then through visual sorting of the diamond-grade material that remains.