Gem Bone short for Gem Dinosaur Bone refers to fossilized dinosaur bones that have been petrified with silica or quartz crystals which gives them their colorful, glassy appearance. This process preserves the actual cell structure of the once living dinosaur. The largest deposits of agatized dinosaur bones are concentrated in the Colorado Plateau of Utah in the Jurassic Era Morrison Formation.

The wide variety of colors in agatized dino bone are caused by minerals such as chlorite, chromium, iron-oxide and manganese that enter the cells during formation. The best dinosaur gembone is brightly colored and has very distinct cells surrounded by web like patterns.

Gem bone is a rare gem material used and collected by jewelers and lapidary artisans.

A group of very dedicated gem bone collectors have labeled themselves boneheads.
The bonehead found an incredible gem bone vertebrae when digging in Utah.
by Jessa1155 March 15, 2010
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A spectacular individual or collective defensive effort in a game of baseball that can result in a single out, double or triple play. A term popularized on ESPN's Baseball Tonight which has a Top 5 Web Gems segment.
The Reds can always rely on Ryan Freel for a web gem or two.
by Andwele Freeman August 20, 2006
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The best call of duty zombies player ever in the world. Went to numerous round 100’s, completed all Easter eggs and is in the top 1% of zombies to this day.
Yo let’s do the Easter egg with GMoney-Gemming
by Lee Ross December 28, 2021
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Nickname for Screen Gems, due to their frightening closing logo, the S From Hell.
The Scream Gems S From Hell is a 5-second horror movie, surely to give you nightmares.
by Chad June 4, 2004
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1. A mysterious lunch food item.
2. A compliment
1.Tina: “what’s for lunch today?”
Josie: “Tater gems.”

2. Jennie said to Tom, “You’re a tater gem”
by Jane Little August 23, 2021
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Gem Steady adj. 1. The art of vibing out to the max. Being so incredibly awesome it almost hurts. Focusing on the good and trying your best all da tiz-ime. Spreading that positive energy everywhere you go. Word.
My levels are on the Kryptonite. I've been kickin' it gem steady and feeling off the chiz-ain all day long. Life is grand.
by Life Coach Brittany C. April 4, 2012
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three or four of the hottest ladies you'll meet if your lucky enough to see them. *Garnet, a thick-thighed square mom. Pearl, a long nosed bird. Amethyst, a sexy ass, big titted, fun mom.

*Ruby &Sapphire. ruby, a real hotty when she is doming her lover. Sapphire, the one who gives garnet her big chest and ruby's wife.
Lars: What are they anyway? Witches or ghosts or something?
Steven: Ugh... They're the Crystal Gems and they save the world and junk.
by Rose Motherfucking Quartz April 6, 2016
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