Fully known as Chinese Opalescent Eggs, also magic eggs. I had no idea what they were when I bought them a couple of years ago. I don't believe in what people usually think of as magic so I just call them opalescent eggs. I don't really know if they are from China.
To be shown off at their best they should be in water and they do need light to give off this golden glow. I just placed this one on the kitchen counter where the sun was coming in. This one was wet because I had had it in the bowl below.
They are very pretty and some people think they have Feng Shui properties, but again, I'm not into that. I just think they are pretty. I see that on the internet some are going for $8.99 each! I paid $1.99 each for mine.
As you see below, I put them in a planter in the living room with some other glass pebbles. They don't give off the light here, but I do think they have a pleasing shape. I like collecting interesting rocks and stones.
I couldn't leave the topic of eggs without mentioning Henrietta, our neighbor's little white bantam hen. She adopted us for 10 months because she liked my bird seed and her freedom, and roosted in the olive tree between our two yards. No-one could catch her, and she and Bailey struck up a friendship through the screen door. Somehow the neighbors managed to catch her many moons later. Soon afterwards, we found her gift to us in the corner of an old forgotten planter!