Tabletop Photography is tricky, and catching a diamond's fire is trickier still.
A good studio setup includes the following:
Camera with at least a 100mm macro lens
tripod
light box
three lights
White acrylic sweep or tabletop (other surfaces are fine, but white keeps things simple)
Place the jewelry inside the light box. This will allow diffuse light to illuminate the objects, so you don't get hot spots or distracting reflections.
Set your key light (primary light source) above and to the front right of the jewelry, so that the light shines through the tent (about 4 o'clock position, but you can experiment); set your fill light to the left and side of the light box.
Put your camera on the tripod, and set a third light (preferably with a snoot, to create a narrow light) as close to your lens as possible. Adjust the light so it hits the facets of the diamond and refracts light to create a sparkle.
You can also try using a specialty light that has multiple tiny bulbs placed close together.
It's best to use professional studio lights, either strobe or hot lights (most pros use strobes). If you use hot lights, be careful not to set your lights too close to the lightbox, or you could start a fire.
Studio photography requires a thorough understanding of lighting. You may want to watch some videos and read books on the topic before getting started to avoid disappointing results.
You can best protect a diamond by keeping it in a soft bag in a safe deposit box in a bank. At home, keep your diamond jewelry that you're not wearing in a soft bag, separate from other jewelry, preferably in a safe. When you wear your diamond ring, take care not to lose it. Don't take it off when you wash your hands or apply lotion, just don't apply the lotion to the diamond jewelry. Keep your diamond in a safe place when you work with your hands, so that you don't damage the diamond setting, which can loosen the stone. And as a professional football player just learned, don't wear your diamond earrings to football practice. A diamond is meant to be seen and admired; it is not a tool. Take your diamond jewelry to a jeweler regularly to verify that the setting is secure. Finally, photograph your diamonds and keep the photograph(s) and your gemologist's certificate(s) for the stone(s) with your insurance policy, that insures your diamonds in a safe place.
Europeans get their diamond jewelry from jewelry manufacturers and jewelry stores -- perhaps from any in the world.
Blue diamond jewelry is very valuable, you can purchase blue diamond jewelry on the internet, on a web site such as Amazon. Or you can contact a local jewelry and have them order it for you, provided you have the money.
A set diamond is a diamond set into a piece of jewelry.
I think it is an "enhanced" diamond.
gemstones
Diamond , Gold , platinum jewelry
There are several websites that sell discount diamond jewelry. Ice.com is a popular site that specializes in discount diamond jewelery, but amazon.com as well as buy.com offer great deals on diamond jewelry for every budget.
Yes, you can sell your expensive diamond jewelry online. Cash for Diamonds, WP Diamonds, Wabash Diamond Buyers, Cash for Diamonds and Circa Jewels are online websites where you could sell your expensive diamond jewelry.
One can purchase diamond ring jewelry at a local jewelry shop or at an official jewelry website such as Tiffany's. Another option would be to purchase jewelry on Amazon or Ebay.
Some examples of cheap diamond jewelry are rings, necklaces, bracelets, tie clips, shirt cuffs, and watches. The smaller the diamond and the more imperfections the cheaper the jewelry.
D for Diamond product line can be found at their company website, eBay, Amazon, Joshua James Jewelry, and Jewelry Junkies. D for Diamond is a jewelry product line.