Because these two gems are different minerals and are valued differently, your question is akin to the question -- which is more expensive: apples or Oranges?
Generally, the highest quality diamond of the same carat weight as the highest quality sapphire, the diamond will be more expensive. However, this statement is not always true.
Diamonds aren't as valuable as society makes you believe. People can even create diamonds, but because of the hype that is involved with engagement rings needing to be diamonds, you pay the price of popularity. Sapphires are much more rare and valuable.
It is true that rubies, sapphires, and emeralds are more rare than diamonds. The reason is that the elements which make up rubies, sapphires, and emeralds which give them their color are more rare in the environment than carbon which is what diamonds are made of.
No. Blue diamonds are formed from carbon and contain trace amounts of boron. Sapphires are formed from corundum, an aluminium oxide (α-Al2O3). Not all sapphires are blue.
No. Pink diamonds are little more but they are both more expensive then colorless diamonds.
Pink diamonds are the rarest and the most expensive of diamonds in the market. Prices can run into the millions due to their rarity. An affordable alternative is pink sapphires which many jewelers recommend.
Diamonds diamonds and more diamonds
Black diamonds are more porous and from younger sedimentary rocks, so they are not as expensive as other diamonds.
Diamonds are more rare than CZs.
Sapphires are dug from the earth in a similar fashion to diamonds. They are located in Montana, North Carolina, and the island of Madagascar.
Yes because diamonds in South Africa is more expensive than in America.
You can watch videos to get free sapphires.
Gramme for gramme. diamonds will cost you more than uranium.
Rubies can and so can sapphires and diamonds