v0.34 Talk:Gem

Just FYI, dwarves can now polish non-gemstone rocks into cabochons in the jewelers workshop. Even slate!--Auric 18:26, 14 March 2012 (UTC)

Gem cuts

If I'm reading it correctly, raw/objects/entity_default.txt defines what cuts of gem a civ can produce:

	Dwarf	Human	Goblin	Elf / Kobold / Animal men
STONE_SHAPE:	OVAL_CABOCHON ROUND_CABOCHON CUSHION_CABOCHON RECTANGULAR_CABOCHON	OVAL_CABOCHON ROUND_CABOCHON CUSHION_CABOCHON RECTANGULAR_CABOCHON	RECTANGULAR_CABOCHON	OVAL_CABOCHON
GEM_SHAPE:	OVAL_CABOCHON ROUND_CABOCHON CUSHION_CABOCHON RECTANGULAR_CABOCHON POINT_CUT_GEM TABLE_CUT_GEM SINGLE_CUT_GEM ROSE_CUT_GEM BRIOLETTE_CUT_GEM EMERALD_CUT_GEM MARQUISE_CUT_GEM OVAL_CUT_GEM PEAR_CUT_GEM SQUARE_BRILLIANT_CUT_GEM RADIANT_CUT_GEM TRILLION_CUT_GEM ROUND_BRILLIANT_CUT_GEM BAGUETTE_CUT_GEM TAPERED_BAGUETTE_CUT_GEM CUSHION_CUT_GEM OCTAGON_CUT_GEM SQUARE_CUT_GEM	OVAL_CABOCHON ROUND_CABOCHON CUSHION_CABOCHON RECTANGULAR_CABOCHON POINT_CUT_GEM TABLE_CUT_GEM SINGLE_CUT_GEM ROSE_CUT_GEM BRIOLETTE_CUT_GEM	RECTANGULAR_CABOCHON POINT_CUT_GEM	OVAL_CABOCHON

Based on this, is the article incorrect in its assessment of how cuts are decided? It would seem "brilliant" is never used alone, and "rose" isn't on our list. I would like someone to check my findings before I edit the article, since I'm not that experienced with looking into the raws. Thanks. --timrem 01:09, 14 April 2012 (UTC)

Moving large gems

Large gems can be used as bait in animal traps, upon destruction of the animal trap, this gems is dropped next to where the animal trap was. So, this is a method for moving gems, though not a very reliable one. Also 'large gems' can be chosen as one of the types of 'finished goods' for a stockpile. Once a large gem is encrusted with other items, dwarves will move it to such a stockpile.

Rarity of gems

I've done some tests with the prospect tool of DFHack on four different locations. Certain gems, like the grossulars and Goshenite, which seem to spawn on marble, are exceedingly rare. Not found a single grossular, I only found Goshenite on 2 maps, one having 3 gems and the other having 133, being at most the third least abundant gem in the map.

I remember there was some sort of bug where a sort of mineral wouldn't spawn due to the presence of another (can't remember but I believe it's related with silver or tin), maybe this is related.

Also, I remember that gems increase the scarser mineral frequency is, although again I don't have the source for this, although it would make sense as most gems don't spawn within mineral clusters.

I could post the prospects (as I've piped them to text) but the map was custom-made, hence somewhat unreliable.--Doktoro Reichard (talk) 16:36, 11 January 2014 (UTC)

I've picked up the good work made by Shandra, treated it according to gems, and found some results. However, those results are... ugly, to say the least. I'll try to supply the Excel spreadsheet, as graphing the results is really really ugly, but I can safely assume the following:

1. Biomes affect the gem distribution. As I didn't find some varieties of Diamonds or Agate in any of the samples, stands to reason that even by messing with mineral frequency one can't make gems appear where they don't belong (e.g. agates can only appear in sedimentary layers).
2. Mineral Scarcity affects the distribution in a strange way. Some gems like Onyx will only appear, and at low quantities, at the lowest setting (hence the biggest frequency), although this might be related to the former point. Other gems, such as Bandfire opal seem to have some sort of tiers, that actually increase with decreasing mineral frequency. And there are others that peak at intermediate ranges.

The dataset, however, is quite noisy, and fails because it's a single location, and as such can not encompass all different types of layers. If one were to take the maximum value of the gems in all the sets, it would come out something like the following:

Rarity of gems

AMETHYST 84773 ALMANDINE 76398 BROWN ZIRCON 73466 SPINEL_PURPLE 73371 RUBICELLE 73100 BLACK ZIRCON 73020 PINEAPPLE OPAL 72908 CHERRY OPAL 72752 OPAL_WHITE 72589 WAX OPAL 72493 OPAL_LEVIN 72478 OPAL_PINFIRE 72414 PIPE OPAL 72394 MILK QUARTZ 70570 SPINEL_RED 64513 MOSS OPAL 63742 QUARTZ_ROSE 49308 YELLOW ZIRCON 48020 PRASE 44369 ONYX OPAL 43648 RED ZIRCON 41437 SMOKY QUARTZ 38893 RESIN OPAL 37697 OPAL_CRYSTAL 32563 BONE OPAL 29050 GREEN ZIRCON 28195 LAPIS LAZULI 25090 MILK OPAL 24293 CRYSTAL_ROCK 19910 TANZANITE 18570 YELLOW SPESSARTINE 18486 CITRINE 18246 CLEAR ZIRCON 18073 JELLY OPAL 17982 OPAL_CLARO 17200 MORION 16048 JASPER OPAL 14722 RED TOURMALINE 14634 FIRE OPAL 14582 BLUE GARNET 14539 PINK TOURMALINE 14533 VIOLET SPESSARTINE 14506 SHELL OPAL 14297 OPAL_REDFLASH 14207 OPAL_HARLEQUIN 13818 HELIODOR 13092 BLACK PYROPE 12944 OPAL_PFIRE 12750 PRASE OPAL 12721 GOLD OPAL 12547 WOOD OPAL 12456 MORGANITE 12441 PYRITE 12369 AMBER OPAL 12028 OPAL_BLACK 12003 RED BERYL 11669 RHODOLITE 11637 CHRYSOBERYL 11560 CINNAMON GROSSULAR 11466 GREEN TOURMALINE 10247 INDIGO TOURMALINE 10225 OPAL_BANDFIRE 10154 MOONSTONE 10004 TOPAZ 9281 PERIDOT 9206 GOSHENITE 8956 SCHORL 8811 PINK GARNET 8719 CLEAR GARNET 8695 CLEAR TOURMALINE 8044 TURQUOISE 7716 EMERALD 7384 TSAVORITE 7160 ALEXANDRITE 6793 GOLDEN BERYL 6221 RED PYROPE 6148 CAT'S EYE 5985 HONEY YELLOW BERYL 5232 AQUAMARINE 3918 KUNZITE 3386 YELLOW GROSSULAR 2530 FORTIFICATION AGATE 2332 TIGEREYE 2285 BANDED AGATE 2276 GRAY CHALCEDONY 2273 CHRYSOPRASE 2266 CHRYSOCOLLA 2235 BLOODSTONE 2205 BLUE JADE 1852 WHITE CHALCEDONY 1653 SARD 1598 MELANITE 1566 RED GROSSULAR 1455 SUNSTONE 1394 TOPAZOLITE 1359 SARDONYX 1110 DIAMOND_FY 975 DIAMOND_LY 813 CARNELIAN 578 AVENTURINE 432 PINK JADE 389 BROWN JASPER 264 PICTURE JASPER 257 ONYX 254 WHITE JADE 233 DEMANTOID 196 GREEN JADE 142 YELLOW JASPER 121 LAVENDER JADE 101 RUBY 92 TIGER IRON 79 LACE AGATE 70 SAPPHIRE 17 PLUME AGATE 15 DENDRITIC AGATE 0 DIAMOND_BLACK 0 DIAMOND_BLUE 0 DIAMOND_CLEAR 0 DIAMOND_GREEN 0 DIAMOND_RED 0 DIAMOND_YELLOW 0 FIRE AGATE 0 MOSS AGATE 0 RUBY_STAR 0 SAPPHIRE_STAR 0 TUBE AGATE 0 VARISCITE 0

In regards to what lead me here, Cinnamon grossulars happen to be infrequent (and not as rare as I thought), as it sits in the middle of the table, but as I said earlier, I did search some sites and found no evidence of it's existence. Also, these grossulars seem to appear only on Mineral Scarcity ranges nearing 25000 (e.g. Rare to Very Rare). This would benefit from a more extensive search, but for now this is what exists so far.--Doktoro Reichard (talk) 16:07, 12 January 2014 (UTC)

Finally got around to add the .xls in a Dropbox. The file is here. Besides the data presented above, there is data on all distributions by scarcity. It's very very ugly though.--Doktoro Reichard (talk) 14:55, 17 January 2014 (UTC)