Gemstone Quality Table
| Class of Stone | #/dwarf /week | Average Uncut Value |
|---|
| Ornamental | 4d10 | 1 gp |
| Semi-precious | 3d6 | 5 gp |
| Fancy | 1d12-1 | 10 gp |
| Precious | 1d10-1 | 50 gp |
| Gems | 1d6-1 | 100 gp |
| Jewels | 1d4-1 | 500 gp |
In addition to the base value of the stones mined in a given week, there is a 1% chance per
week of operation that a miner will discover an exceptional stone. If an exceptional stone is
found, its value is equal to the base value of the mine's stones multiplied by a d100 roll. For
example, an exceptional stone found in a semi-precious stone mine is worth 10 gp (the average
value of an uncut, semi-precious stone) x d100. Players may also consult the Type of Stones
Table to determine the exact types of stones found.
Ornamental Stones
| 1d100 | Stone Type |
|---|
| 01-08 | Azurite |
| 09-16 | Banded Agate |
| 17-24 | Blue Calcite |
| 25-32 | Eye Agate |
| 33-40 | Hematite |
| 41-48 | Lapis Lazuli |
| 49-56 | Malachite |
| 57-64 | Moss Agate |
| 65-73 | Obsidian |
| 74-82 | Rhodocrosite |
| 83-91 | Tiger Eye Agate |
| 92-00 | Turquoise |
Semi-Precious Stones
| 1d100 | Stone Type |
|---|
| 01-07 | Bloodstone |
| 08-15 | Carnelian |
| 16-23 | Chalcedony |
| 24-31 | Chrysoprase |
| 32-39 | Citrine Quartz |
| 40-47 | Jasper |
| 48-55 | Moonstone |
| 56-59 | Onyx |
| 60-67 | Quartz Crystal |
| 68-75 | Rose Quartz |
| 76-83 | Sardonyx |
| 84-91 | Smoky Quartz |
| 92-00 | Zircon |
Fancy Stones
| 1d100 | Stone Type |
|---|
| 01-12 | Alexandrite |
| 13-25 | Amber |
| 26-38 | Amethyst |
| 39-51 | Chrysoberyl |
| 52-64 | Flourite |
| 65-77 | Jade |
| 78-90 | Jet |
| 91-00 | Tourmaline |
Precious Stones
| 1d100 | Stone Type |
|---|
| 01-25 | Aquamarine |
| 26-50 | Blue Spinel |
| 51-75 | Peridot |
| 76-00 | Topaz |
Gemstones
| 1d100 | Stone Type |
|---|
| 01-25 | Garnet |
| 26-50 | Jacinth |
| 51-75 | Opal |
| 76-00 | Red Spinel |
Jewels
| 1d100 | Stone Type |
|---|
| 01-25 | Diamond |
| 26-50 | Emerald |
| 51-75 | Ruby |
| 76-00 | Sapphire |
Newly mined gemstones are not nearly as valuable as they are after finishing. Gemstones are
rough and even unrecognizable when first discovered. Characters with the Mining or Gem
Cutting proficiencies can correctly identify a stone after 1d6 rounds of study.
The quality of a gemstone mine depends on the number of stones in each find and the value
of the stones. The number of stones is that which one miner can excavate in one week.
The value of the stones is the average value for an uncut stone, which is 10% of its cut value.
To realize the full amount from the gemstones, a miner needs to employ a character with the
Gem Cutting proficiency. Some stones are more or less valuable than this amount, but the
average is as accurate as we need to get to calculate the income from the mine.
The output of a gemstone mine does not remain constant, it is rolled each week to determine
the worth of that week's output. The number of miners at work each week is determined before
the dice are rolled.
[Complete Book of Dwarves]
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