These are some of the magical materials that can be found in the Estian Islands. They are almost all essences of some sort.
Gems
| Gemstone | Element | Rune | Deity | Magic School | Essence |
|---|---|---|---|---|---|
| Ruby | Fire | s Sowilo | Heimdall | Conjuration | Primal (fire) |
| Sapphire | Cold | i Isaz | Aegir | Abjuration | Primal (water) |
| Amber | Thunder Lightning | x Thurisaz | Thor | Evocation | Primal (air) |
| Emerald | Poison Acid | k Kauna | Loki | Illusion | Primal (earth) |
| Amethyst | Force | g Getho | Tyr | Transmutation | Arcane (lawful) |
| Opal | Psychic | d Dagaz | Odin | Divination | Psionic |
| Diamond | Radiant | a Ansuz | Freya | Enchantment | Divine (positive) |
| Onyx | Necrotic | p Pertho | Hel | Necromancy | Divine (negative) |
Each cardinal gemstone is linked with an element, a rune, a deity, and a school of magic, and a type of essence. There are a myriad of lesser gemstones, such as alexandrine, carnelian, and aquamarine, but they are mostly used for decorative purposes.
Gems are useful both as decoration, magical foci, and as high-density value storage. Gems are usually bought and sold at their full value. A transaction involving many thousands of gold is often conducted at least partially in gems. A thousand gold pieces weighs about 20 pounds, while a gem worth the same maybe weighs an ounce. A drawback with using gems as value storage is that unlike metal coins, they lose value if they are split into multiple pieces.