Dopamine Molecule Necklace I use the most gorgeous high-quality sparkly sterling silver chain which makes this necklace as one reviewer says "absolutely stunning." Keep this in mind when comparing similar products. Dopamine is a neurotransmitter in the brain that plays a crucial role in regulating mood, motivation, and pleasure. It is often referred to as the "feel-good" neurotransmitter because it is associated with feelings of reward and pleasure when released in the brain. Imbalances in dopamine levels have been linked to various mental health conditions, including depression, schizophrenia, and addiction. Dopamine also has an elegant shape. As a necklace, it is an attention-grabber. Perfect for the chemistry or biology lover in your family! As a research scientist, this piece is one of my favorites! Necklace is 18 inches and pendant measures 1.8 inches in width. Molecule information card included. Purchase includes a molecule information card, a natural jewelry box, and gift packaging. Gift? Add-on a hummingbird card for only $7: https://www.etsy.com/listing/202506976/nikola-jewelry-hummingbird-card Add-on extender: https://www.etsy.com/listing/197483038/add-on-necklace-extender-chain-with Necklace longer than 20 inches: https://www.etsy.com/listing/196689227/extend-my-necklace-up-to-30-inches Turn pendant into a keychain or ornament: https://www.etsy.com/listing/1003597263/turn-any-pendant-into-a-key-chain-or ★ ITEM DETAILS ★ Chain: Sterling Silver, Gold, or Rose Gold Pendant: Tarnish resistant gold or silver plated Sterling Silver jewelry is an alloy that contains a mixture of 92.5% pure silver and 7.5% of another metal, usually copper. Sterling silver is safe for sensitive skin; however, it must be stored in a dry dark place as over time it will tarnish. It can be restored with a silver polish cloth.