23a:Gem

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v50.13 · v0.47 · v0.34 · v0.31 · v0.28 · v0.23.130.23a This article is about an older version of DF. More Info · V

Small clusters of rough gems can be found strewn throughout the mountain. Cut gems can be used to encrust furniture, crafts, weapons, armor and ammunition, to create windows. In addition, raw rock crystals are required to make crystal glass goods. Rough gems, cut gems and their crystal expressions can be used in the creation of legendary artifacts.

Gems have no value in rough form. First they need to be cut in a jeweler's workshop. Cut gems have a base value of 5, which is multiplied by appropriate value modifier from the table above. Items can be decorated (encrusted) with cut gems; all such decorations have a value of 10 times the gem type's value multiplier.

Sometimes, rough gems will be cut into crafts or large gems. The chance of creating a "large gem" or craft is roughly 1 in 3, the skill of a gem cutter does not affect this number at all, only the quality of the finished good produced.^[Verify] Note that these will replace a cut gem and cannot be used to encrust goods. Such crafts can easily reach hundreds, even thousands depending on the gem.

You can also manufacture raw glass, which is the same as a lower-value, uncut gem.

Varieties

Gems come in 21 varieties, with their own color and value multipliers:

Rarity	Gem name	Value (×)	Color
Synthetic	green glass	2	☼♦2
Synthetic	clear glass	5	☼♦3
Synthetic	crystal glass	10	☼♦7
Ornamental	rose quartz	3	☼♦4
Ornamental	aventurine	3	☼♦2
Ornamental	turquoise	2	☼♦1
Ornamental	rock crystal	2	☼♦7
Semi-Precious	red spinel	20	☼♦4
Semi-Precious	chrysoberyl	20	☼♦2
Semi-Precious	aquamarine	20	☼♦1
Semi-Precious	opal	20	☼♦7
Precious	ruby	40	☼♦4
Precious	emerald	40	☼♦2
Precious	sapphire	40	☼♦1
Precious	diamond	40	☼♦7
Rare	red diamond	60	☼♦4
Rare	star ruby	60	☼♦4
Rare	green diamond	60	☼♦2
Rare	blue diamond	60	☼♦1
Rare	star sapphire	60	☼♦1
Rare	clear diamond	60	☼♦7

Unlike other gems, diamonds can ignite if they come into contact with magma.

Clusters of Ornamental gems can be found anywhere in the mountain, semi-precious gem clusters can be found most commonly beyond the cave river, and precious gem clusters most frequently occur beyond the chasm; however, there is always the chance for rarer gems to appear earlier in the mountain. Occasionally, mining out a gem cluster will produce a gem of the same color but higher rarity, producing a message such as "A miner has found some <gem> mixed with the <gem>". This is normally the only way to find Rare gems.

Glass

Raw glass is treated as an uncut gem. There are three subtypes of raw glass (and, once cut, of cut glass gems):

Gem name	Value	Color	Requires
green glass	2×	☼	bag full of sand
clear glass	5×	☼	bag full of sand + pearlash
crystal glass	10×	☼	rough rock crystal + pearlash

Making raw glass requires a dwarf with the glassmaking labor designated, and, just like working metal, it also requires fuel (either coke or charcoal) at a normal glass furnace, or magma at a magma glass furnace. Like all gems, raw glass has no quality modifiers.

Raw gems are only one of the many things your glassmakers can make from glass. See glass and glass industry for more information.