High-res ore textures: gold, silver, ruby and diamond as lumps in the earth, no veins

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

art/generated/textures/PROMPTS.md

@@ -40,12 +40,6 @@ Solid packed brown earth seen from above, soil with small stones, roots and dark
 Hard dark blue-grey bedrock seen from above, angular rock facets and deep cracks, very solid and impenetrable.
 ```
 
-## gold: T_GOLD (gold seam)
-
-```text
-A uniform all-over pattern of brown earth crossed by many thick glittering veins of bright yellow gold ore with large shining gold nuggets, the gold covering about a third of the surface, evenly spread from edge to edge.
-```
-
 ## water: T_WATER
 
 ```text
@@ -74,3 +68,22 @@ python3 tools/make_tile.py <name>-raw.png <name> --size 256 --colors 48 --band 2
 ```
 
 `<name>-256.png` is copied to `assets/textures/<name>-256.png`.
+
+## Gold, silver, ruby and diamond: lumps without veins (2026-11-07)
+
+Made from the earth picture so the soil matches: `fal-ai/nano-banana-pro/edit` with
+`earth-raw.png` as the reference image (`aspect_ratio: 1:1`, `resolution: 1K`, one image each).
+The prompt template, `{ore}` per kind:
+
+```text
+Keep this exact seamless tileable earth texture (same colours, same soil, same style, same top-down view) and embed {ore} scattered in the soil: about twelve separate lumps of different sizes, partly buried, spread evenly over the whole image including near the edges. No veins, no lines, no cracks filled with ore, no streaks - only separate lumps. The texture must stay seamless across all four edges. No text.
+```
+
+- gold: `chunky nuggets of shining yellow gold`
+- silver: `chunky nuggets of bright shining silver ore`
+- ruby: `chunky raw red ruby crystals`
+- diamond: `chunky raw clear pale-blue diamond crystals`
+
+Gold has four variants (`--size 128` and `--size 256` like the others). Silver, ruby and diamond
+have two variants: one seamless tile for both (`--size 64 --colors 32 --band 8` and
+`--size 128 --colors 48 --band 14`), copied to `assets/textures/<name>.png` and `<name>-128.png`.