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21377-marezine 23517-marinol 28779-marplan 35887-matulane 39433-mavik 35050-maxair 37123-maxalt 37121-maxalt-mlt 30266-maxaquin 24500-maxibolin 21792-maxidex 18994-maxipime 21897-maxitrol 31861-maxolon 27482-maxzide 27483-maxzide-25 30664-mazanor 22292-md-50 22277-md-60 22278-md-76 22279-md-76r 22287-md-gastroview 38292-mdp-bracco 16773-measurin 30668-mebendazole 30715-meclan 30676-meclizinehydrochloride 30716-meclodium 30718-meclofenamatesodium 30738-meclomen 14409-medigesicplus 23737-medihaler-epi 23894-medihalerergotamine 28913-medihaler-iso 28253-medipren 31669-medrol 31712-medrolacetate 30743-medroxyprogesteroneacetate 30763-mefenamicacid 30766-mefloquinehydrochloride 19103-mefoxin 19108-mefoxinindextrose5inplasticcontainer 19110-mefoxininplasticcontainer 19112-mefoxininsodiumchloride09inplasticcontainer 30771-megace 30772-megacees 15018-megatope 30773-megestrolacetate 34720-melfiat 34682-melfiat-105 38855-mellaril 38853-mellaril-s 30790-meloxicam 30838-melphalanhydrochloride 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38332-myoview 38333-myoview30ml 17806-myphetanedc 35753-mysoline 15439-mytelase 33080-mytrexa 33545-mytrexf 32107-m-zole3combinationpack 32108-m-zole7dualpack

Rubies

The ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum. The red color caused mainly by the presence of the element chromium. Its name comes from ruber Latin for red. Other varieties of gem-quality corundum called sapphires. The ruby considered one of the four precious stones, together with the sapphire, the emerald, and the diamond. All natural rubies have imperfections in them, including color impurities and inclusions of rutile needles known as silk. Gemologists use these needle inclusions found in natural rubies to distinguish them from synthetics, simulants, or substitutes. Usually the rough stone heated before cutting. Almost all rubies today treated in some form, with heat treatment being the most common practice. However, rubies that are completely untreated but still of excellent quality command a large premium. The Price of rubies primarily is by color. The brightest and most valuable red called pigeon blood red, commands a huge premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions may indicate that the stone been treated. Cut and carat also determine the price. In the evaluation of colored gemstones, color is the single most important factor. Color divides into three components, hue, saturation and tone. Hue refers to color as we normally use the term. Transparent gemstones occur in the following hues: red, orange, yellow, green, blue, violet, purple and pink are the spectral hues. The first six are spectral hues; the last two are modified spectral hues. Purple is a hue that falls halfway between red and blue. Pink is a paler shade of red. In nature there are rarely pure hues so when speaking of the hue of a gemstone we speak of primary and secondary and sometimes tertiary hues. In ruby the primary hue must be red. All other hues of the gem species corundum called sapphire. Ruby may exhibit a range of secondary hues. Orange, purple, violet and pink are possible.