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How to choose a diamond?

When buying a diamond it is very easy to get carried away. Before you begin shopping determine a budget. Only you can decide what amount is comfortable for you. But remember - Diamonds are expensive

diamonds, diamond rings, wedding rings, engagement rings, jewerly, wedding, advice

Set a Budget

When buying a diamond it is very easy to get carried away. Before you begin shopping determine a budget. Only you can decide what amount is comfortable for you. But remember - Diamonds are expensive

Know the 4C's

Over the years, diamond professionals have developed standards for comparing and evaluating diamonds. These standards are better known as the 4 C's - Carat weight, Color, Clarity, and Cut - which, together, affect the appearance and value of the diamond. A diamond's value is influenced by its rarity. Even the slightest differences can make a huge difference in value. Before purchasing your diamond you should take the time to learn what characteristics influence a diamond's value. Only then can you decide which of the 4C's - Carat weight, Color, Clarity, and Cut - are most important to you. Strive for a stone that offers the best combination of the 4C's.

Choose the shape that pleases you
Today's most popular shape is round but diamonds come in many appealing shapes.

Choose your diamond's color
Remember, the difference in color is minute but the price is not.

Choose the Clarity

Most diamonds have blemishes and inclusions. These inclusions are what makes your diamond unique. Diamonds are graded under 10 power magnification, so you might think twice before paying for better clarity that can't be seen with the naked eye.

Carat weight

Obviously everyone strives to purchase as large a diamond as possible. Remember, a large diamond is not always a beautiful diamond. Make sure you haven't compromised too much on the other 3C's before selecting your diamond. Be especially careful on the diamond's cut. A poorly cut diamond loses its fire and brilliance, therefore looking more like a piece of glass.

Search for your perfect diamond

Just enter your search criteria into our easy-to-use <a href="http://www.diamondsafe.com/loose-diamonds.asp" target="_blank">diamond search </a>engine and you'll be on your way to purchasing a beautiful diamond.

Should you still have any hesitations about ordering your diamond, visit our web site: <a href="http://www.diamondsafe.com/" target="_blank">http://www.diamondsafe.com</a>, and our on-staff GIA Graduate Gemologist and Diamond Graduate will do their best to provide you with all your diamond needs.

 

How to Sell Your Diamond Ring

Most advertising campaigns by De Beers feature their famous slogan “A Diamond is Forever.” Consequently, women seldom sell a diamond and often feel uncomfortable buying diamonds previously owned by other women. There is a sentimental aspect to diamonds that is very different from other tangible assets like boats, houses or automobiles. However, there are occasions when consumers need to sell their diamonds.

diamond, diamond ring, selling diamonds, jewelry store, jeweler, jewellery, consignment, auctions, appraiser, eBay

Most advertising campaigns by De Beers feature their famous slogan “A Diamond is Forever.” Consequently, women seldom sell a diamond and often feel uncomfortable buying diamonds previously owned by other women. There is a sentimental aspect to diamonds that is very different from other tangible assets like boats, houses or automobiles. However, there are occasions when consumers need to sell their diamonds and, unlike the used car market, there is not a well-developed method for consumers to sell their diamonds.

As a consumer, you face some unique challenges when trying to get the best price for your diamond in a safe and comfortable manner. Your starting point is to know exactly what you are selling. This is much easier if the diamond has a grading report from a major laboratory like the GIA or AGS. You have more of a challenge if there is no formal grading report. In this case, you need to find an independent appraiser who can evaluate the diamond and determine its quality and potential value.

Once you know your diamond’s specifications, you can find the current retail asking price by checking with online retailers to see what similar diamonds are selling for in today’s retail market. It is unlikely you will be able to get the going retail price for your diamond. Selling your diamond at 80% to 90% of that amount would make it sell quicker. Be realistic about your expectations. The lowest cost online retailers, not the expensive jewelry stores with double the price, set the value of your diamond.

You now know your target price and simply have to figure out how to find the right buyer for your diamond. There are several options available to sell your diamond and you need to determine which is best for maximizing your money and safety while minimizing your time and effort.

Your first thought might be to go to the closest jewelry store or pawnshop and sell them the diamond. The key to remember here is that they do not need your diamond. They can get all the diamonds they want on the wholesale market. The only reason they will buy your diamond is if the price is a fraction of the wholesale price. They hope you need the money bad enough to take 25%-50% of what you could be getting for your diamond elsewhere. They might offer you a little more if you “trade up” to something in their display case. However, this often results in you paying more for the new diamond and receiving less for your diamond than if you sold it elsewhere.

Several online brokers specialize in buying diamonds and estate jewelry from consumers. They typically have you ship the diamond to them so they can determine the amount they will pay you. All too often, this amount is much less than their preliminary estimate so you must either pay the return shipping, or accept their price. If your main priority is getting money fast, this is a valid option. If your main priority is getting top dollar for your diamond, there are better selling methods available to you.

Auctions like eBay are very popular for selling jewelry items but there is so much low quality jewelry listed, it is hard for potential buyer to find your quality diamond. You are competing with jewelry retailers whose entire business is selling on eBay so they are experts at writing the descriptions (often with exaggerated quality), taking impressive pictures and shipping their items. Even if a bidder does find your item, the odds of getting your target price are slim to nil because other retailers are advertising items with similar descriptions for about half the amount you want. Notice I did not say they are advertising similar quality, just similar descriptions. Do a search for diamond rings with GIA grading reports and you will see the vast majority of diamond rings have paperwork from sources you have never heard of before.

Other effective ways to find a buyer are classified ads in local newspapers and bulletin boards at church or work. The challenge is reaching enough people to find at least one buyer willing to pay your price. You have to be careful when doing this kind of transaction, especially if selling to a stranger. Do the transaction in a safe place and be sure you have a valid form of payment. You do not want to hand over your diamond and end up with a phony cashiers check or bad personal check.

Some jewelry stores and online retailers will sell your diamond on consignment. Online retailers with a local presence have an advantage in that they have large numbers of diamond shoppers on their website plus walk in traffic that can see your diamond in person. They also have lower overhead and prices so you can get a bigger share of the selling price. With jewelry stores often marking up prices over 100%, your share is likely to be less than half of the selling price.

Just be sure to get a written description of the item you are giving on consignment and the minimum amount you will accept for your diamond. All too often sellers are not being able to get their jewelry items back from a store or only receive a fraction of the amount they expected from the sale. However, if you have patience and a low priced, trustworthy retailer to broker your diamond, you have an excellent chance of getting an excellent price for your diamond without the hassle and safety issues of selling it yourself.

 

How To Use Diamond Tool To Cut Steel In Micro Machining?

If a diamond tool were to be used to cut steel, the diamond tool will face severe tool wear. While diamond only softens at 1350 degree Celsius and melts at 3027 degree Celsius, and is also the hardest material in the world, it has a weakness.

tool,diamond,diamond tool,steel,cut,ultrasonic vibration,surface,vibration,ultrasonic,cut steel,precision,cutting,surface finish,process,machining

The diamond tool is commonly used in micro-machining as it can withstand the micro hardening of the workpiece surface during micro-machining. This micro-hardening creates enough resistance to break the tool bit easily in micro milling, but not a diamond tool. Micro-machining using diamond tool could be performed at high speeds and generally fine speeds to produce good surface finish such as mirror surfaces and high dimensional accuracy in non-ferrous alloys and abrasive non-metallic materials.

However, if a diamond tool were to be used to cut steel, one of the most common engineering materials used in industries, the diamond tool will face severe tool wear. While diamond only softens at 1350 degree Celsius and melts at 3027 degree Celsius, and is also the hardest material in the world, it has a weakness. Diamond succumbs to graphitization, which means that it will change its crystal structure to graphite crystal structure at 200 degree Celsius in the presence of a catalyst metal such as carbon steel and alloys with titanium, nickel and cobalt.

There have been various attempts to improve the tool life of the diamond tool while cutting steel so as to improve the efficiency and profitability of this operation. Such processes include micro-cutting the steel workpiece in a carbon-rich gas chamber as well as a cryongenically cooled chamber. However, these methods require costly equipment modification and restrict direct supervision of the micro-cutting process.

The latest breakthrough came when the diamond tool was subject to ultrasonic vibration during micro-cutting. It has been shown that a diamond tool subject to ultrasonic vibration can cut the steel well enough to produce a mirror surface finish with acceptable tool life. The ultrasonic vibration at the diamond tool tip allows the tool face to cool down considerably during the cutting process and delays the chemical reaction between the diamond tool and the steel workpiece. As a result, the diamond tool life is increased by a few hundred times.

For example, a single crystal diamond tool with feedrate 5 micron/revolution, cutting speed zero to 5m/min and depth of cut 10 micron was attached to a ultrasonic vibration generator so that the diamond tool tip vibrated about 4 microns while it was used to cut stainless steel. The mirror surface finish of the cut steel surface was measured at 8 nm Ra!

With more and more machining companies moving into the niche micro machining field, such ultrasonic vibration assisted cutting can only help the progressive company to achieve process leadership and innovative differentiation.

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