There are many very special and popular pieces of jewelry in the world, signet rings, zultanite rings, snake rings, mood rings to name a few.
For example, zultanite jewelry and alexandrite jewelry can take on different colors in different lights.
Outdoors under clear skies, zultanite appears rich champagne with a light yellow sparkle; indoors under traditional lighting, it turns a kiwi green color; and under candlelight, it emits an orange halo.

In the meanwhile, anxiety relief ring have been used as a stamp since ancient times.
Mood rings, the focus of today, are also very special. They can change colors according to the emotions of the wearer.
 
What is a mood ring?
A mood ring is a piece of jewelry that changes color according to the wearer's body temperature and emotions. It is made of temperature-sensitive materials and metals.
 
This color-changing property makes it a very popular piece of jewelry and an excellent gift to the one you care about.
 
Mood ring colors
Mood rings show different colors according to the wearer's body temperature, colors including purple, green, blue, black, yellow, red, pink, brown and so on. Different colors have different meanings.
 
Mood ring color meanings
What do the colors on a mood ring mean? Here is a complete list of mood ring color meanings.
 
Purple mood ring meaning: Romantic, passionate, excited, happy.
Green mood ring meaning: Curious, mixed emotions, relaxed.
Blue mood ring meaning: Calm, relaxed, inspired, happy.
What does black mean on a mood ring: Melancholy, tense, nervous, painful.
What does pink mean on a mood ring: Lovable, happy,
What does brown mean on a mood ring: Cautious, worried, bold.
What does orange mean on a mood ring: Nervous, worried, annoyed.
What does yellow mean on a mood ring: Excited, unsettled, anxious.
Amber: Slightly restless or anxious, unhappy.
Gray: Very restless or anxious.
Red: Anxiety, angry, intense, high energy. 
How do mood rings work?
Mood rings are made from color-changing liquid crystals, or "mood stones", which are sensitive to temperature. They change colors based on the temperature of the finger of the wearer, which is greatly influenced by his or her emotions.
 
To be detailed, since the body temperature is significantly determined by peripheral blood flow, which is modulated by the autonomic nervous system, we can say that the body temperature fluctuates when a person's mood changes and thus the mood ring takes on different colors according to the wearer's emotions.
However, it should be noted that the ring not only changes colors according to the body temperature, but also according to the environment.
 
For example, when our body temperature is normal and we are indoors, the ring is usually blue, that is, happy and relaxed.
However, when we go outside and the temperature increases, the ring changes colors too. Those who do not know the inside story might think that their mood has changed, but it was not true.
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Where to buy high quality mood rings?
If you want to buy handmade mood rings from artisans, ranging from $10-$50, you can check Etsy.
You can buy a purple mood ring, a blue mood ring, a sterling silver mood ring, men's mood rings or even mood necklaces that are affordable and of high quality and have them delivered to your house.
 
If you prefer fast delivery, then Amazon is a better choice. With Amazon, returns and refunds are much easier too so you can ensure that you get the right product.