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Folklore and Mythology
- In the Russian Mythology and Tales, specifically the byliny, large gems are commonly attributed with the ability to emit light and are used in that capacity by the bogatyrs to light the way.
- In medieval folklore, it was held that an absolutely perfect ruby would glow from within, like a red-hot coal.
- Gesta Danorum, book VIII: When Thorkill, on his voyage to Utgard-Loki, goes to explore an unknown shore in a region of eternal darkness, he fixes a gleaming jewel to the mast of his ship to mark the way back.
- In The Adventure of the Blue Carbuncle, the titular gemstone is described as "a brilliantly scintillating blue stone, rather smaller than a bean in size, but of such purity and radiance that it twinkled like an electric point".
- In The Silmarillion, the three Silmaril gems were made from the light of magic trees, causing the gems to glow perpetually. The light is so pure that the gems burn any evil being that touches them. One of the gems was eventually made into a star.
- In The Hobbit the Arkenstone of Thrain (AKA The Heart of the Mountain) is described as shining with its own inner light.
- The eponymous stormlight in The Stormlight Archive is energy that suffuses any gem exposed to one of the powerful storms that frequently ravage the setting. The glowing gems are thus commonly used as a light source, and the light can also be drawn in by magic-users or power magitek.
- Glowing gems are visible signs of Deryni power:
- The gryphon-shaped emerald inlay of Morgan's signet ring glows against the black onyx background when the ring is magically attuned to the Deryni mage holding it. Properly attuned to Duncan in Deryni Rising, it allows him to unlock a secret compartment in the high altar of Saint Hilary's Basilica in Rhemuth.
- The gems used in the Haldanes' power triggering ritual glow internally when a drop of blood from the next heir(s) comes in contact with the stones. This is true for both the Eye of Rom (a single red ruby mounted as an earring) and the Ring Of Fire (a ring with red garnets set in a cluster).
- Shiral crystals also glow when a Deryni or someone with a triggerable potential concentrates sufficiently.
- In the Tales of Kolmar trilogy, dragons' soulgems gleam with an inner light when they are alive. When dead, the gem shrinks and becomes dull, but it will glow again during a Kin-Summoning. The soulgems of the Lost - the dragons who were cursed to lose their sentience - still glow, unattached to the dragon, thousands of years later, so the others know that the Lost are still "alive" somewhere out there.
- In the short story "The Mischief Done" by Edmund Crispin, the solution to the mystery relies on the "fact" that diamonds glow in the dark after lengthy exposure to bright light.
- Splinter of the Mind's Eye. The small fragment of the Kaiburr Crystal has a crimson hue deeper and richer than a ruby and a vitreous luster resembling crystallized honey. It also glows softly. The whole Kaiburr Crystal (of which the fragment is but a part) gives off a dimly pulsing light when inactive. When activated by a Force user it shines with an unnatural brilliance and its glow spreads to cover the person using it.
- In Magic: The Gathering the art for Prophetic Prism (see also the page image) and Chromatic Star depicts these artifact gems as this. It's Justified in that they are Mana altering artifacts, capable of energy into death, holy or elemental Mana.
- Dungeons & Dragons
- The following magical gems in 1st/2nd Edition glowed either on command or continuously: Gem of Brightness, Gem of Delusion, Jewel of Obsession, the Jacinth of Inestimable Beauty, the huge glowing orange Cursed Wishing gem in S1 Tomb of Horrors and the magical ruby called the Eye of Arik in B3 Palace of the Silver Princess.
- A number of early edition adventures included gems with a Continual Light spell cast upon them to make them glow, such as T1-4 The Temple of Elemental Evil, I12 Egg of the Phoenix and the Dungeon magazine #50 adventure "The Object of Desire". Continual Light creates a white light: if the gem is colored, the light it gives off will be the same color as the gem.
- Module I5 Lost Tomb of Martek. When one of the Star Gems is placed in the hollow below the writings on the Obelisk Stone, the Gem starts to glow with a soft white light. When it's pointed in the direction of Martek's tomb it will flare up with a brilliant white light.
- Clerics of the gnome deity Segojan Earthcaller cast Light or Continual Light spells on large, well-cut gems for use as holy symbols, causing them to glow from within.
- Dungeon magazine
- Issue #26 adventure "Nine-Tenths of the Law". In the Back Story, Artanal the Mage cast a Magic Jar spell on a ruby and used to store his soul. The ruby glows brightly while his soul is it
- Issue #31 adventure "Telar in Norbia". In the ruined city of Telar there is a room with red and green crystals in the corners and ceiling. The crystals glow with a faint luminosity that glows eerily in darkness. They were once a power source for a scrying (divination) device.
- Call of Cthulhu
- Dreamlands campaign setting, adventure "Pickman's Student". While exploring the dream version of Elder Yuggoth, the PCs can encounter 4 dully glowing green gems that some Mi-go are using to restrain a Dark Young of Shub-Niggurath. Later on the PCs see one of the Mi-go sacrifice the Dark Young with a knife that has a blade made of the glowing gemstone.
- Campaign Spawn of Azathoth. The Investigators can acquire two stones that are necessary to deal with the Seed of Azathoth. At the climax of the adventure, the stones become strange fist-sized, glowing ovoid gems that increase greatly in weight.
- Earthdawn. During the Scourge, light spells were cast on quartz crystals, which were then used to brighten underground kaers and sealed cities. After the Scourge, as the population of Barsaive re-entered the outside world, light quartz continued to be used to dispel the darkness.
- Traveller. MegaTraveller Journal magazine #3, article "Races of the Domain: Crenduthaar". Chagas gems are a crystallized mineral salt found on the planet Thaar that can be as large as a human fist. They are blood-red, translucent and contain a pulsing inner light.
- Champions adventure Wrath of the Seven Horsemen. The scepter of the supervillain Fear has a ruby that glows with an eerie luminescence.
- Arduin RPG. The Compleat Arduin Book 2: Resources
- The Witch Fire Wand is tipped with a glowing sapphire the size of a golf ball.
- The Greater Demon Zyrax, the Dark Oracle has an artifact: a large magickal ring carved from a single ruby that glows with its own fire.
- In Colossal Cave, the Plover Room is filled with an eerie green light — which, apparently, comes from the enormous emerald in the middle.
- In Space Quest II: Vohaul's revenge. Put gem in mouth.
- In Quest for Glory I: So you want to be a hero? The talking skull Bonehead wants one just like his non-talkative brethren before he'll let the hero see the Ogress witch Baba Yaga.
- The Chaos Emeralds, and the Master Emerald if it's present and whole, from Sonic the Hedgehog are typically portrayed as this. Not surprising since they're all supposed to be fonts of unimaginable power.
- A Very Long Rope to the Top of the Sky: Justified; Active saecelium crystals give off constant power, some of that power is inevitably going to be lost via entropy as electromagnetic radiation, including visible light.
- In the Tom and Jerry cartoon "Blue Cat Blues", Tom's would-be girlfriend has her rich boyfriend buy for her a huge diamond (about a metre across) — which can only be safely looked at through welding goggles.
- In Disney's Aladdin, the giant red gemstone in the lamp chamber of the Cave of Wonders illuminates its altar without any other apparent source of light. This could simply be magic of some kind, considering the nature of the cave.
- In Avatar: The Last Airbender there is the Underground City of Old Ba Sing Se, which has been buried underneath the modern one. It's constantly lit by the glowing green crystals also used as lamps throughout the Earth Kingdom.
- Aang also gives Zuko some valuable advice in "The Firebending Masters": never touch "giant, glowing gems sitting on pedestals."
- In the Popeye animation Aladdin and His Wonderful Lamp, Aladdin (played by Popeye) asks the genie of the lamp to deliver a chest of gold and jewels to the princess (played by Olive Oyl). The contents include several head-sized gemstones that bathe the room in colored light, including a diamond that is so brilliant the princess needs sunglasses to look at it — and her window turns it into a spotlight to illuminate Aladdin posing outside on his horse.
- The first episode of He-Man and the Masters of the Universe featured a titular Diamond Ray Of Disappearance who's light could be directed as a disintegration beam. It was so bright, it could even be seen as He-Man gripped it in his hands as he tried to crush it.
- Some diamonds are fluorescent. This will cause them to shine with more (visible) light than is shed on them.
- As the acronym indicates,note lasers increase the amount of light effectively available by making the photons work with, rather than against, each other. The first laser was a(n artificial) ruby.