Source: Rob Lavinsky, – CC-BY-SA-3.0 Yellow Spheneīeside red and green, sphene, better known as titanite for its titanium content, also occurs as yellow stones. The yellow gemstones are extremely rare, however, and are only mostly availed of as collector’s pieces. While known mostly for their red color, which makes them great substitutes for ruby, spinel also occurs as yellow stones, along with black, blue and green. The yellow gems make rather expensive jewelry due to their rarity. Unlike salt, the yellow gemstones are not soft and soluble, but are resistant to weathering. The yellow rocks are borate minerals, a group which includes salt. Source: Parent Géry via Wikimedia Commons Yellow Rhodizite and Londoniteīeside white, rhodizite and londonite both occur as yellow stones. Sapphire remains the birthstone for the zodiac sign Taurus. Though traditionally a birthstone for the month of April, sapphire in general has been made the birthstone for the month of September in the Western calendar, while the Hindu calendar designates the precious stone as the July birthstone. Beside green, black and its best known color, blue, sapphire occurs as yellow gemstones. Sapphires come from the mineral corundum, which is second only to diamond in hardness, and when red is called ruby. Source: Parent Géry via Wikimedia Commons Diamond in general is the traditional and modern birthstone for the month of April, both in the Western and Hindu calendar. The precious yellow stones command high prices when they are vividly yellow, otherwise known as the fancy canary diamonds. A variety of the yellow gems can be quite expensive, however, even more expensive than white diamonds. The yellow precious stones do exist, produced by the intrusion of nitrogen into the otherwise colorless precious stones - which is the most common impurity in diamonds. People like white diamonds over the yellow gemstones, however, which explains how white or clear diamonds are so rife in the market to the point that people think all diamonds are white. Yellow diamonds, not clear or white diamonds, are in fact the most common of diamonds, with red and black among the rarest.
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