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 ...

Gemfields sold 5.7 million carats of sapphire, corundum and rubies under its latest auction, conducted over three days earlier this month. In July, Gemfields announced it had appointed former De ...

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 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 ...

You get bonus points for spending on travel, dining and some everyday purchases. Points are worth more when used to book through Chase.

The Vienna University of Technology (German: Technische Universität Wien, TU Wien; formerly: k.k. Polytechnisches Institut, Imperial and Royal Polytechnic Institute from 1815–1872; Technische ...

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 ...

The lower the score, the greater the chance of you defaulting on your loan and the less likely you are to get approved for a premium credit card, like the Chase Sapphire Reserve®. The factors ...

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 ...

Thank you for submitting your question. Keep reading Forbes Advisor for the chance to see the answer to your question in one of our upcoming stories. Our editors also may be in touch with follow ...