A few examples of my leaf spoons. They are about 9" long and made out of Pyrex glass. The leaf is made with a leaf press. I use them for honey in my tea or to stir my hot chocolate. When they are dirty, they go into the dishwasher.
Pyrex if considered "Hard Glass", the same stuff cooking glass is made of. "Soft Glass" is what your soda/beer bottles are made out of. Many lamp work blowers (glass beads) are made out of soft glass because they melt at a lower temperature. But we'll get into the chemistry of glass blowing another day.
OK, a little chemistry. Believe-it-or-not, the color in the top spoon starts out amber. Once it hits the flame, it comes out amber and purple. It has something to do with an oxidizing and reducing flame. But more on that later.