Jewelcrafting: gems, rings, amulets, trinkets

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -10,7 +10,7 @@ Alpha. One season, bandit raids plus two friendly events, six buildings.
 ## What's in it
 
 - **Skills:** mining, woodcutting, farming, hunting, fishing, smithing,
-  construction (with masonry), cooking, leatherworking, tailoring, herblore,
+  jewelcrafting, construction (with masonry), cooking, leatherworking, tailoring, herblore,
   combat, prayer and reconnaissance. Smiths also make hardware for builders,
   one kind per metal (copper rivets to rune locks), which fittings and
   buildings need.
@@ -43,6 +43,14 @@ Alpha. One season, bandit raids plus two friendly events, six buildings.
   material at every tier (ore, hunted hides, farmed fibres), and past copper
   each piece also needs reagents from that tier's area: plating, lacing or
   thread.
+- **Jewellery:** Jewelcrafting sets a gem in a band. Each tier's rock turns
+  up its gem 2% of the time (quartz, garnet, amethyst, sapphire, emerald,
+  diamond), and jewellers prospect spare ore for more (5 ore, 15%). Bands
+  are copper, then silver and gold, which the jeweller mines and smelts
+  without a smithy. Past quartz each piece needs a shard from that tier's
+  area. Rings for offence (accuracy, crit, power), amulets for defence (max
+  HP, ward, regen), trinkets for the rest (XP, double gathering,
+  masterwork).
 - **Tiers:** six RuneScape-style tiers (copper, iron, steel, mithril,
   adamant, rune at levels 1–75) of ore, trees (up to enchanted), hides (deer,
   boar, bear, elk, sabrecat, mammoth) and fibres (flax, cotton, silk,
@@ -53,7 +61,8 @@ Alpha. One season, bandit raids plus two friendly events, six buildings.
   level 5, so a city). Gear needs a combat level to wear, tools a skill
   level to use.
 - **Classes are trades,** from gathering to finished goods, so each player has
-  a quiet gathering side and a busier crafting side: miner (mining, smithing),
+  a quiet gathering side and a busier crafting side: miner (mining, smithing,
+  jewelcrafting),
   builder (woodcutting, construction), homesteader (farming, cooking,
   herblore, tailoring) and ranger (hunting, fishing, leatherworking,
   cooking). A trade's skills are 20% faster, 1 in 10 of its crafts make