Gold
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By weight, diamonds are worth more because they are much more rare than gold.
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.
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.
It depends on how the diamonds are set. If they are in prongs, then yes. If they are channel set, it can get more tricky. Any pictures of the ring? Wade http://www.weddingringsforever.com
Black diamonds are more porous and from younger sedimentary rocks, so they are not as expensive as other diamonds.