How Diamonds are Treated

Diamonds are often treated,same as watches. If you are concerned about getting true value for your money, know what you are getting.
Filled for clarity: Diamonds with inclusions are sometimes filled with glass to make them appear clearer. Yehuda Diamonds have undergone this treatment. Filler can be damaged by heat, ultrasonic cleaning, and by re-tipping. The filling does not repair the inclusion, it just makes it less visible.
If you look at a filled diamond closely, rotate it under light, you should be able to notice a bluish flash. Yehuda will usually refill your diamond for free if it is ever damaged. Check for guarantees before buying such a diamond.
Irradiated for color: Can be affected by heat.
Painted for color: Can be painted to offset a yellow tinge. The paint wears off rather quickly.
Ask if the diamond you are considering buying is treated. Getting a notarized statement from your jeweler saying that your diamond in not treated is recommended. This is like having the jeweler swear under oath that to his/her knowledge that the diamond is not treated. Several states have disclosure acts requiring dealers to tell you about these treatments.
Often,some diamonds are fixed on some watches,such as Rolex 2008 New Model,Rolex Datejust,Rolex Daytona,Rolex Submariner,Rolex Sea-Dweller,Rolex Day-Date,Rolex Yachtmaster,U-BOAT watches,Chopard,Dior,Rado, Richard Mile and Buberry ,there are also some good diamonds on the watches.