I had a good friend who was a rock hound. He would go out and either find rough rocks in the wild, or buy them. Then clean, cut and polish them. For some of the rocks he would mount them as jewelry.
He told me about a gift he made for his mother-in-law. It was a very involved project. He took a great piece of Onyx, cut it like a heart and polished it up. Then he mounted it in a necklace. I forget the exact number of hours he spent on it, but it was quite a few. When he was done it was beautiful. It got a nice jewelry box and put a little note it in, then mailed it to his mother-in-law.
When she got it she called him to say how much she loved it, but she was a bit confused about the note.
“Why do I need to keep it in the freezer when I am not wearing it?” she asked.
“Well,” he said, “onyx is a very hard and darkly colored stone. So if you keep it cold, then I can tell everyone that my mother-in-law has a very cold, hard, black little heart.”
She thought it was very funny, and it is one of her most treasured pieces of jewelry. She even keeps it in the freezer too.
It is good to have family with a sense of humor.
BTW, if you have a mother-in-law with a good sense of humor you can buy an onyx necklace for her.