diff --git a/app/routers_v2/players.py b/app/routers_v2/players.py
index 34fefe1..e3fd018 100644
--- a/app/routers_v2/players.py
+++ b/app/routers_v2/players.py
@@ -143,6 +143,14 @@ def normalize_franchise(franchise: str) -> str:
     return FRANCHISE_NORMALIZE.get(titled, titled)
 
 
+TIER_DIAMOND_COLORS = {
+    1: "linear-gradient(135deg, #40b040 0%, #1a6b1a 50%, #145214 100%)",
+    2: "linear-gradient(135deg, #50a0e8 0%, #2070b0 50%, #185488 100%)",
+    3: "linear-gradient(135deg, #e85050 0%, #a82020 50%, #7e1818 100%)",
+    4: "linear-gradient(135deg, #a060d0 0%, #6b2d8e 50%, #50226a 100%)",
+}
+
+
 def resolve_refractor_tier(player_id: int, variant: int) -> int:
     """Determine the refractor tier (0-4) from a player's variant hash.
 
@@ -809,6 +817,7 @@ async def get_animated_card(
         else:
             card_data["cardset_name"] = this_player.description
         card_data["refractor_tier"] = refractor_tier
+        card_data["filled_bg"] = TIER_DIAMOND_COLORS.get(refractor_tier, "")
         card_data["request"] = request
         html_response = templates.TemplateResponse("player_card.html", card_data)
 
@@ -845,6 +854,7 @@ async def get_animated_card(
         else:
             card_data["cardset_name"] = this_player.description
         card_data["refractor_tier"] = refractor_tier
+        card_data["filled_bg"] = TIER_DIAMOND_COLORS.get(refractor_tier, "")
         card_data["request"] = request
         html_response = templates.TemplateResponse("player_card.html", card_data)
 
@@ -944,6 +954,9 @@ async def get_batter_card(
         card_data["refractor_tier"] = (
             tier if tier is not None else resolve_refractor_tier(player_id, variant)
         )
+        card_data["filled_bg"] = TIER_DIAMOND_COLORS.get(
+            card_data["refractor_tier"], ""
+        )
         card_data["request"] = request
         html_response = templates.TemplateResponse("player_card.html", card_data)
 
@@ -984,6 +997,9 @@ async def get_batter_card(
         card_data["refractor_tier"] = (
             tier if tier is not None else resolve_refractor_tier(player_id, variant)
         )
+        card_data["filled_bg"] = TIER_DIAMOND_COLORS.get(
+            card_data["refractor_tier"], ""
+        )
         card_data["request"] = request
         html_response = templates.TemplateResponse("player_card.html", card_data)