Losing a diamond is stressful and you may not know where to begin to look for it. Here are some ideas on how to find a missing diamond and what worked for me (last slide). You won't believe it! Hope these ideas help you find your missing diamond.
Turn off all the lights and use a flashlight
This will work best at night. Hold the flashlight level to the ground to see if you catch any reflections or see shadows cast. I read using a black light might assist with finding a glare but I did not have one.
Have children help search
Kids are so good at finding small objects! Maybe even given them an incentive of a small cash amount to make it fun for them. No kids? Ask some neighbors!
Use a standard broom
Use long sweeping motions in the area you were in to see if it shows up in a pile.
Walk barefoot
It can be as easy as accidentally stepping on it.
Check your purse, pockets and gloves
These might be the places where your ring may have snagged and the diamond may have fallen out.
Use a robot vacuum
This worked for me, the second time around. Clean out the robot and let it go, when you clean it out, dump it out on a white paper towel.
Allow your robot to run several times throughout the house
I let the robot go everywhere in the house and was thrilled when I found it in the gathered dust!
Good luck!