Ruby ring: where to get it

Source	Quantity	Chance per roll
Bird's nest (ring) []	1	9/100
Bird's nest+ (ring) []	1	1,439/7,058
Black key black []	1	Rare
Black key brown []	1	Rare
Black key crimson []	1	Rare
Black key purple []	1	Rare
Black key red []	1	Rare
Cave horror []	3	7/128
Cave horror []	3	7/128, 3 rolls
Chest (Ardougne Castle) []	1	181/1,226
Dried zombie []	1	2/128
Former vampyre (Male) []	1	Uncommon
Magpie [{'content': 'Estimated rarity may be inaccurate due to a low sample size.', 'name': 'inaccurate'}]	1	84/854
Menaphite gift offering (large) []	1	33/800, 4 rolls
Menaphite gift offering (large) (Ironman Mode) []	1	33/800, 4 rolls
Menaphite gift offering (medium) []	1	33/800, 3 rolls
Menaphite gift offering (medium) (Ironman Mode) []	1	33/800, 3 rolls
Menaphite gift offering (small) []	1	33/800, 2 rolls
Menaphite gift offering (small) (Ironman Mode) []	1	33/800, 2 rolls
Otherworldly being []	1	126/8,192
Skeletal hand []	1	22/2,316
Skeleton (Ullek) []	1	2/128
Small chest [{'content': 'All items in the above table drop together at once.', 'name': 'p18'}]	1	3/150
Unspeakable horror []	4–6	7/128
Unspeakable horror (elite) []	4–6	7/128, 3 rolls
Zombie hand []	1	22/2,316