Sapphire is actually all corundum- aluminum oxide that is not red. The word is primarily derived from the Greek ‘sappheiros’ whose meaning is blue. However, one needs to put in mind the fact that sapphire does not occur only in blue hue. Rainbow sapphires can be green, brown, brown, and pink, this highly depends on the presence of various kinds of minerals. A good example is that, the presence of chromium leads to the production of pink sapphire and the presence of iron results in yellow and green rainbow sapphires which are very good for modern jewelry. images Rainbow sapphires are majorly found in Australia, although some countries like Sri Lanka, India and Burma have them. Indian sapphires source is Kashmir. These sapphires are cornflower blue in color and are said to be actually the best blue sapphires for gemstone jewelry. Sri Lankan rainbow sapphires are the most available and are typically light to rainbow jewelrymedium blue in color which is very common on online jewelry stores. The majority of fancy-colored rainbow sapphires available in the jewelry stores online are from Sri Lanka. The most available of these fancy rainbow sapphires are yellow, or golden, and pink in color. The pinkish orange ones are the rarest and most expensive in modern jewelry. Rainbow sapphires found in Thailand and Australia, are dark blue in hue. The gemstone jewelry gotten from these two countries primarily belong to the type of the cheap to average cost range of rainbow sapphire gemstone jewelry in the stores. Montana on the other hand is the single most sources of rainbow sapphires in the United States. The rainbow sapphire produced is of an appealing metallic blue in hue. Most of the modern rainbow sapphire gemstone has had their hue improved, by the most common method, heating. The reason for doing this is to give an enrichment of coloration and improvement of its clarity. With this method of heat treatment colorless or paled-colored sapphire gemstones have been changed to brilliant blue or yellow ones. This is highly dependent on the originality of the material and the kind of heating process, heating of sapphire gemstones can lead to the production of various results. A good example is sapphires that have rutile -titanium dioxide crystals which can be treated by heating and at the same time being cooled quickly. This results in the dissolving of the rutile into the corundum and the gemstone becoming vivid. Colorless or pale-colored gemstones after undergoing heating in the absence of oxygen would change to deep blue color. However, you should put in mind that, if these stones are being heated in the oxygen presence, they would change into very deep yellow hue. Most yellow rainbow sapphires have been treated in this way. Sapphire gemstones designer jewelry is considered beautiful, rare and very much durable. The beauty of a rainbow sapphire gemstone is undiminished with time. A sapphire gemstone could sparkle in many years to come. It has lasting value and is well liked by many as a choice for modern jewelry.