I'm going to show stones and list their powers.
Currently, only the following can use the stones:
Galenion
Legolas
Sallia
Vala
Gaeion
Morolas
Thranduil
Legolia
Roan
The Oracle
The whole, blood thing makes the stones workable by ANY member of the Thranduil family.
Here is a quick reference list of stone names and their powers!
Note: These are subject to change as I see fit. I mean, come on... it's hard to come up with that many powers all at once!
Agate - Creates/Controls Storms
Aluminium - Allows the user to know the direction of their target
Amber - Immobilizes
Amethyst - Focuses the powers of other stones on a specific target
Ametrine - Allows for Spirit Possession of another's body
Ammolite - Negates Magic
Aquamarine - Water
Benitoite - Creates a tangible void of Darkness (like a Globe of Darkness)
Beryl - Teleportation
Beryl Yellow - Lightning
Bixbite - Temperatures (can make things hot or cold)
Cassiterite - Increases Physical Defenses
Chrysoberyl/Alexandrite - Snow
Chrysocolla - Shapeshifter Ability
Citrine - Can actually make the Sun Rise
Clinohumite - Induces Passion (I know.... don't say it!)
Cordierite - Can actually make the Moon Rise
Corundum - Control Rocks, Boulders, Earth, etc...
Diamond - Holy Energy
Diamond Blue - Healing
Diamond Green - Increases your Stamina
Diamond Yellow - Increases Telepathy
Diamond Gray - Increases your five senses
Emerald - Skyrockets your Charisma
Feldspar / Moonstone - Creates Serenity and Calm
Garnet - Creates Explosions
Garnet Mozambique - Causes Volcanoes to Errupt
Hematite - Can imprison (can like, create shackles out of thin air)
Jade - Controls Animals
Jasper - Creates Hatred
Kunzite - Used to clear the mind
Lapis Lazuli - Restores Life
Malachite - Controls Plants
Obsidian - Dark Evil Energy
Olivine Dark - Creates Mental Instibility
Olivine Light - Creates Uncertainty
Peridot - Can induce Dreams/Visions
Pyrite - Causes Earthquakes
Quartez - Invisibility
Ruby - Fire
Sapphire - Shields from Elemental Magic
Sapphire Red - Shields from Physical Attacks
Sapphire Gray - Shields from Weapons
Sapphire White - Shields from Mental Intrusions
Sapphire Yellow - Shields from Mental Attacks
Sapphire Dark Purple - Shields from the Elements themselves
Star Sapphire - Shields one from the attacks of the Valar themselves
Spinel Dark - Creates Food
Spinel Red - Creates Drink
Tanzanite - Induces Sleep
Tiger's Eye - Allows one to see another's thoughts
Topaz - Levitation
Topaz Champagne - Telekinisis
Topaz Mystic - Transfers Magical Abilities of others to the user
Topaz Sky Blue - Amplifies the Magic of others
Tourmaline - Erases Memories
Tourmaline Multi Colored - Restores Memories
Turquoise - Used to Shape Things Magically
Zeolite - Controls Sand and Wind
Zircon - Allows one to blend with the shadows
Zirconia Champagne - Stops Time
Zirconia Garnet - Slows Time Down
Zirconia Golden - Speeds Time Up
Zirconia Olive Green - Allows one to see the Past
Zirconia Pink - Allows one to see the Present
Zirconia Violet - Allows one to see the Future
Zoisite - Control the Shadows (kinda like Ytain)
So, without further adieu, here are what all of the stones look like!
Note: List is subject to change or be added to if I find more pics!

Agate

Aluminium

Amber

Amethyst

Ametrine

Ammolite

Aquamarine

Benitoite

Beryl

Beryl Yellow

Bixbite

Cassiterite

Chrysoberyl / Alexandrite

Chrysocolla

Citrine

Clinohumite

Cordierite

Corundum

Diamond

Diamond Blue

Diamond Green
Diamond Yellow
Diamond Gray

Emerald

Feldspar / Moonstone

Garnet

Garnet Mozambique

Hematite

Jade

Jasper

Kunzite

Lapis Lazuli

Malachite

Obsidian

Olivine Dark
Olivine Light

Peridot

Pyrite

Quartez

Ruby

Sapphire

Sapphire Red
Sapphire Gray
Sapphire White
Sapphire Yellow
Sapphire Dark Purple

Star Sapphire

Spinel Dark
Spinel Red

Tanzanite

Tiger's Eye

Topaz

Topaz Champagne

Topaz Mystic

Topaz Sky Blue

Tourmaline

Tourmaline Multi Colored

Turquoise

Zeolite

Zircon

Zirconia Champagne

Zirconia Garnet

Zirconia Golden

Zirconia Olive Green

Zirconia Pink

Zirconia Violet

Zoisite
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