Aluminum oxide (Al 2 O 3), also known as alumina, corundum, sapphire, or ruby, is one of the best insulators used in a wide ...

Sapphire is September's birthstone. This gem belongs to the corundum family. Corundum is inherently colorless, according to the International Gem Society. So, each stone's elemental structure ...

The red color is caused by traces of chromium. Corundum also forms sapphire in many colors, which generally come from trace mixtures of iron, titanium, and chromium. Emeralds are formed of a ...

Like their gemstone cousin the sapphire, rubies are just a variety of corundum, or aluminum oxide. Where sapphire gets its blue tint mainly from iron, rubies get their pink to blood-red hue from ...

The most expensive sapphire ever sold was $135,000 per carat ... Rubies, like sapphires, are made of corundum. Rubies are ...

When putting together the best team composition for Pokemon Ruby and Sapphire, you will ideally want to include traded critters and some of the OG favorites. Generation III was one of the best ...

The card earns bonus points for travel and dining-related spending, which can be redeemed for more value through Chase. It piles on the perks, too, but they come at a price. With a big sign-up ...

The Chase Sapphire Preferred® Card is a popular choice for consumers who want to open a travel card without paying hundreds of dollars a year. With a $95 annual fee, it ranks as one of the best ...

Chase is a leader in travel rewards cards, and its Sapphire cards have become cult favorites for frequent travelers. When it launched the Chase Sapphire Reserve® in 2016, there was so much demand ...

Commissions do not affect our editors' opinions or evaluations. The Chase Sapphire Preferred® Card is one of the most popular travel cards thanks to a perfect combination of features. It earns ...

Please view our full advertiser disclosure policy. The Chase Sapphire suite of cards are some of the best credit cards for travel available. In addition to excellent rewards and redemption ...

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