Sapphires, Rubies and Emeralds as Engagement Rings The most common choices for precious gemstones as an engagement ring are sapphires, rubies and emeralds. Here is the outlined information of each gemstone. Sapphires are mineral stones called corundum, which is the crystalline form of aluminum oxide, and which comes in a variety of gemstone colors, such as blue (a common choice color), pink, yellow, green, purple. For sapphire stones, which are in a red form, they are no longer called sapphires, but rubies. A jeweler’s standard guidelines, the 4 C’s – cut, clarity, color and carat, is the yardstick in assessing a gemstone’s value and quality, such that for sapphires, in which they are rarer than diamonds, their clarity of the stone, color and carat value will depend on the source location of where the sapphire stone was mined, with blue and pink as high valued gemstones, while their cut will depend on the jeweler’s creative design.
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With a Corundum composition structure that measures a scale of 9 on a Moh’s hardness scale, sapphires are among the hardest gemstones next to diamonds, and for this reason, it can be considered as a durable which can be used as gemstone rings.
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Sapphire stones are highly valued not just for its rarity, but also because of its historical association to royalty and its symbol of sincerity and faithfulness, such that King Solomon’s seal was believed to be made from sapphire, Prince William of England proposed to Kate Middleton with his mother’s iconic sapphire engagement ring, and 45th wedding anniversaries use sapphire as its symbolic ring celebration. Like that of sapphires, rubies have the same Corundum composition, but with the exception that it comes in a red form, which is due to the presence of chromium, being an impurity in the stone, but considered a rarity, making rubies as valuable gemstones. Rubies are classified as highly valued gemstones, especially those mined from Burma, because they are extremely rare to find, that’s why they are rarer than diamonds. Just like the sapphire stones, rubues are among the hardest gemstones attaining a scale of 9 in the Moh’s hardness scale. Formed from a mineral called beryl, which is also the same mineral component in such gemstones as aquamarine, helidor, and morganite, are emerald gemstones. Emeralds, just like rubies, contain an element impurity called chromium, which results in a grass green emerald color, and which makes the emeralds as very rare and highly valuable gemstones. Emeralds, too, are rarer than diamonds and the range of their degree of value is dependent on the range of their green coloring, such that the intense grass green color is most desirable and, therefore, highly valuable compared to the pale green color. Emeralds have a scale on 8 in the Moh’s scale of hardness, which means that these stones are reasonably durable, and, therefore, vulnerable to heat damage and extreme changes in temperature, which can cause them to break.