Synthetic Alexandrite is a kind of gemstone. Gemstones are like special rocks that people think are pretty, and they wear them as jewelry like necklaces or earrings. Alexandrite is a special type of gemstone that changes colors in different lighting conditions. It can look green in daylight, and reddish-purple in artificial lighting.
The synthetic alexandrite is made in a laboratory using special machines and chemicals. Scientists make it by taking other minerals and heating them up really high. Then they add more things to the mixture to make it look like real alexandrite.
It's called "synthetic" because it's not found naturally in the earth like diamonds or emeralds. Think of it like making a yummy cake, but instead of getting all the ingredients from nature, you use a recipe and mix all the ingredients together to create your own version of the cake.
People often use synthetic alexandrite in jewelry because it looks like the real thing, but it's less expensive. So people who want to buy a pretty and unique piece of jewelry can go for this gemstone to get the look and benefits without spending too much money.
So, in a nutshell, synthetic alexandrite is a man-made, pretty gemstone that changes color and can be used for jewelry.