What does it mean if your diamond reflects blue light?
Everything that you can see reflects light to some degree (that is how you see it). Just because you can't see something though doesn't mean it doesn't reflect light. It may be the object is too small or reflects too little light for you to see it, or that it reflects light not visible to the human eye (like infra-red or ultra-violet)
Everything reflects light if it didn't we would not be able to see anything. Also if Earth absorbed all the light it would also mean that it is absorbing all the other radiation, in which case it would be come very inhospitable very quickly. Earth reflects The energy from the sun to keep us in balance and allow life.
Each dashboard light on a Honda Civic reflects a different component on the car. There is a check engine light, brake light, battery light, oil light, and several other that each relate to an engines system. When these lights turn on it mean that either a repair or maintenance is needed on the vehicle.
Since blue light has more energy than red light should this mean anything about the preferred color of warning and stop lights?
If by 20 cents you mean .20 carats, you may be able to purchase such a diamond using this example as a guideline. Today, on Blue Nile, you can purchase a .23 carat diamond and pay between US$270 and US$782, depending on the colour and clarity that you want. A .23 carat diamond is the smallest diamond available for sale at Blue Nile today.
It is possible that you have had some contact with a company, such as Blue Cat Networks, or The Blue Cat Cafe, that uses a blue cat as a logo. Otherwise, there is no particular symbolism in a cat that has been painted blue. Perhap you favor a sports team whose colors are blue; in that case, the dream reflects your enthusiasm for that team.