No. Diamonds do not change color. Their colors are decided before they're dug up.
Yellow diamonds are gemstones with a definitive yellow appearance.
The major difference between yellow diamonds (also known as fancy yellow diamonds) and clear diamonds is their color. Yellow diamonds get their color from nitrogen impurities in the crystal structure, while clear diamonds, also known as colorless diamonds, have no noticeable color impurities. Yellow diamonds are considered unique and rare, while clear diamonds are more traditional and popular for engagement rings.
Canary diamonds are a type of yellow diamonds known for their intense yellow hue. They are considered one of the most valuable and sought-after fancy colored diamonds due to their rarity in nature and vibrant color. Canary diamonds are typically graded based on the intensity of their yellow color.
Potatoes do not turn into diamonds.
Yellow diamonds are gemstones, and are used in jewelery and for other adornments.
Yellow diamonds are sometimes called canary diamonds. A significantly large yellow diamond is owned by Tiffany and Company, and is named The Tiffany Diamond.
Wikipedia lists 14 yellow diamonds in its list, below. You can click that link, then link to named yellow diamonds.
Most every diamond not identified as another colour is slightly yellow -- some are intensely yellow. However, Intense Fancy Yellow diamonds -- natural diamonds -- are not common, and are therefore more valuable than comparable diamonds without the intense fancy designation.
Your answer depends on the diamond. All diamonds are valued according to their clarity, colour, carat weight and colour. White diamonds that are low on the 'while colour scale' -- L to Z (giving them a yellow cast) are less valuable than yellow diamonds evaluated as yellow colour.
yellow diamonds are just very flawed white diamonds, they are extremely common compared to colorless (white) diamonds and are used for tool and other things because the jewelry world sees them as "ugly" or "useless" but like all things sometimes someone likes yellow diamonds and request for one but those are rare, isolated cases.
Canary diamonds are yellow-tinted diamonds.
Natural pink diamonds are more rare than natural yellow diamonds, probably because the common trace element nitrogen is responsible for a yellow cast in a diamond. Some colourless or 'white' diamonds are considered yellow, when graded with a colour grade from I to Z, as below. Natural pink diamonds exist 'due to structural anomalies" according to Wikipedia, and are very rare. Some diamonds can be altered (or enhanced) to appear yellow or pink, and when altered, are less valuable than naturally colored diamonds.