Spherical light descending from a high altitude.

It had been a very hot day in the UK, about 105F and my wife and I decided to sit in our garden at around 11.45pm as it was too hot to sleep because very few homes here have air conditioning. We have been learning to meditate and decided to try it outside. We live in a quiet area with little light pollution. After around 15 minutes, I opened my eyes to see a small point of white light at a very high altitude. We live on the flight paths of a number of airports and know what aircraft look like after dark. This light had no red and green wing lights. It was moving east across the sky. I pointed it out to my wife and we saw the light stop, then it started to descend. The light grew bigger and bigger until it stopped. It was around double the size of a U.S. quarter at arms length. The sphere looked like an illuminated diamond of beautiful colours. It looked like it was observing us for around 10 seconds before ascending again and carried on moving eastwards.