Yellow diamonds, also known as canary diamonds come in all shapes, sizes and colors with the intense yellow and vivid yellow being the most expensive colors. They are quite rare and just as expensive and usually have a very high grade issued by GIA. Black diamonds that are available in the market are usually low grade white diamonds that have been colored black, however, natural black diamonds can be expensive depending on the quality.
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Both are rare, especially if you mean Intense Fancy Yellow -- most gem-quality diamonds have a little yellow in them -- or Black, or carbonado, diamonds.
Gold
By weight, diamonds are worth more because they are much more rare than gold.
A more recent substitute for diamonds is moissanite. This is a silicon carbide crystal which, although rare naturally, is relatively easy to synthesize. It used in both gems and industrial applications.
Yellow diamond rings can vary widely in price depending on factors like carat weight, clarity, cut, and the quality of the diamond's color. On average, you can expect to pay anywhere from $3,000 to $20,000 or more for a yellow diamond ring. However, rare or exceptionally large yellow diamonds can command prices in the hundreds of thousands or even millions.
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