If you are looking to buy a fine example of a blood red ruby ring then your best bet might be to take a trip to Asia, or at the very least find a jeweller who specializes in gems that originate from Burma and Vietnam. You will also find some fine examples from Thailand or Cambodia, but if you want the best its a good idea to stay away from those that hail from Africa or Afghanistan.
You should be aware that its possible to have a blood red ruby ring that isn’t completely natural as it has been exposed to treatments that are used on inferior rubies to make them appear richer and darker than the earth created them. They are real runies of course, but they have been artifically “improved” by human hands and are not a valauble as they might look. There is nothing wrong with buying such a gem, but you will want to know the truth about its origin to ensure yoa re not paying over the odds. If you are buying ruby rings for just a few hundred dollars then the chances are that it has been treated in some manner or another to enhance it appearance.
Rubies which are 100% natural will always state this to justify their high selling price. If there is no such guarantee on the ring you are lookig at then you can once again assume that it has been treated to bring out the color.
One thing you will want to be aware of if you are resorting to buying a cheaper ruby is that the heating process that is often used has the potential to make the stone more brittle, causing it to crack in the process. This can lead to the jeweller needing to wax or oil the gem in order to fill in any cracks. This will never happen it an untreated ruby and therefore they won’t have any cracks in them.