I just checked, and here's the One Ring's entry in artifact.txt:
	Specifically, note the A: line. Rarity of 1. Meanwhile, Grond has a rarity of zero because it's never supposed to be generated "naturally", only by being forced into Morgoth's drop.
							
						
					Code:
	N:13:'The One Ring'
I:ring:55
W:100:100:2:5000000
A:1:100 to 127
P:0:0d0:15:15:0
# F: DRAIN_MANA | DRAIN_HP | 
F:LIGHT_CURSE | HEAVY_CURSE | PERMA_CURSE
F:AGGRAVATE | DRAIN_EXP | SEE_INVIS | REGEN | TELEPATHY
F:IM_FIRE | IM_COLD | IM_ELEC | IM_ACID
F:RES_FIRE | RES_COLD | RES_ELEC | RES_ACID | RES_DARK
F:RES_DISEN | RES_POIS | RES_NETHR
F:SUST_STR | SUST_DEX | SUST_CON |
F:SUST_INT | SUST_WIS |
F:INSTA_ART
E:BIZARRE:200+9d50
M:{name} glows intensely black...
L:5:STR | INT | WIS | DEX | CON | SPEED
							
						
							
						
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