I spent a happy hour picking Rainbow Obsidian Palm stones as ovals, tears, hearts and more on a business trip. I was making sure each one had rainbows. Here is a lovely group. In the photos you may/may not see a rainbow but they are there. Also unfortunately black always shows up dust! There maybe minor inclusions on the backs. And for some the backs are plain black, or grey, or golden or purple. I took the photo in full sun to try and best see the colours. Dimensions are for the left one.
Just found out these have a new name of Celestial Eye Obsidian which was probably named as so much of the new rainbow stock was coming out with only a couple of gold-ish / green-ish shades of layers rather than 3+ colours.
Its a lovely way to add love to your learning about life which can be very challenging at times. This crystal is useful when used to help soften and ease the effects of shock or fear. And it can help protect the overly sensitive against depression. However they often are bought by people who just find these hearts decoratively interesting. Great birthday gift.
Rainbow obsidian pillows in tear shapes so you can carry them or put in a hemp necklace.