'Best price' assumes you're interested in the highest value diamond for the least cost.
In order to maximize your budget, best practices dictate that you educate yourself as to the vagaries of cut, clarity, colour and carat weight of diamond gem-stones, so that you can purchase the highest quality diamond given your budget.
Superior, gem-quality diamonds are coupled with certificates from certified gemologists, so that there is no question that the diamond you're buying fits the criteria described in the certificate.
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The best way to buy diamonds depends on how you want them. The internet is always a good source for buying diamonds, although there are sometimes issues with fraud and credibility. Local or well known jewelry stores may have higher prices but you get piece of mind in knowing that you've seen the diamond before purchase.
Blood diamonds find their way into any market by way of people who traffic in blood diamonds, which is illegal. The responsibility remains on the buyer, to demand a Kimberly Certificate for any diamond purchase, which is the best way anyone can protect themselves from participating in this illegal activity. It may not be a perfect process, but for the moment, it's our best option.
You can purchase Diamonds in the Rough by Avenged Sevenfold at almost any music store. Most Best Buys will have it, and you can also purchase it online.
The best way to clean a diamond is a warm bowl of water and dish soap. Soak the diamonds in that mixture for about five minutes.
One may purchase natural diamonds at "Brilliant Earth". The vendor sells only Canadian Certified diamonds and claims that they are eco-friendly diamonds.
If one is looking for loose diamonds in order to have some jewellery made, the best place to go to would be a master goldsmith. That way one can be sure to find out what size and shape of diamond or diamonds would be suitable for the planned purchase. Some websites that offer information on loose diamonds include "Bluenile, Lumera, and Whiteflash".
Canary diamonds are bright yellow-colored diamonds. One can purchase them from jewelers, as well as from online mega-retailers such as eBay and Amazon.
You can purchase diamonds in most any city in the world. There is no 'city' where diamonds are mined, however.
There are several companies that create synthetic diamonds or cultured diamonds. One such company that creates the best synthetic diamonds is New World Diamonds.
At the online store 'Enhanced-Diamonds' one can purchase a number of diamond products including rings and stand alone diamonds. They are enhanced for increased clarity.
Businesses in Israel purchase raw diamonds from brokers, and cut the diamonds, which then can be sold as finished gemstones.
You can purchase them from the laboratory, or from a jeweler who sells man-made diamonds.
You would pay for every gem-quality diamond in the total weight according to its colour, clarity, carat weight and cut. If you're buying industrial diamonds -- bort -- your price depends on the quantity and frequency that you purchase the stones. This is the only practical way to purchase diamonds in the quantity suggested by your question.