A means to spend your Caps in exchange for direct game-play benefits.

Yours and your spouses rings can be equipped simultaneously, yours on the left hand, spouses on the right.
At an armor workbench they can be enchanted and upgraded with up to 3 powerful Special bonuses and effects each, at a scaling cost of Caps.

The rings can be changed from Left to Right at a chemistry station, should you wish. 
Remove any enchantments you wish to keep, and unequip the ring for the conversion option to appear
And there are additional rings to be found in Nuka-world, which can be useful for giving to a companion to wear.

Rank 1 enchants are 500 caps.
Rank 2 requires the (removed) Rank 1 enchant mod to be in your inventory, plus a further 5,000 caps.
Rank 3 requires the (removed) Rank 2 enchant mod to be in your inventory, plus a further 25,000 caps.
This will not detect from the workbench.  The loose mods have no value nor weight, so should be kept in the player's inventory.

Each ring has three slots.  You can remove an enchant from one slot and add it to another.  It should not be possible to accidentally purchase identical enchants so long the loose mod is kept in your inventory.  However you can stack the same enchant on each of the ring slots if you so wish.
For the sake of keeping the menus clean, you will not be able to see higher ranks without possessing the prior rank's loose mod.

The enchants are:

Strength / Perception / Endurance / Charisma / Intelligence / Agility / Luck
Rank 1: +2 to the respective stat.
Rank 2: +5
Rank 3: +15

Carry Capacity
Rank 1: +100 capacity
Rank 2: +500 capacity
Rank 3: +1,500 capacity  &  +100% move-speed while encumbered

Critical Hit
Rank 1: +10% crit chance (in and outside vats)
Rank 2: +20% crit chance
Rank 3: +35% crit chance  &  Detect life while in combat

Defense
Rank 1: +20 Physical  &  +20 Energy  &  +10 Poison
Rank 2: +50 Physical   &  +50 Energy  &  +20 Poison  &  +500 Radiation  &  Flame Retardant
Rank 3: +150 Physical   &  +150 Energy  &  +50 Poison  &  +1,000 Radiation  &  Hazmat Protection  &  Flame Retardant

Experience
Rank 1: +25% Exp gains
Rank 2: +50%
Rank 3: +100%

Health
Rank 1: +100HP
Rank 2: +250HP  &  0.5% HP recovery
Rank 3: +750HP  &  1% HP recovery  &  1% Radiation recovery

Jumping
Rank 1: 2x Jump Height
Rank 2: 3x Jump Height  &  Fall damage immune
Rank 3: 4x Jump Height  &  Fall damage immune  &  Jetpack
(Note: The method for the Jetpack to be animated was copied in its entirety from CROSS Jetpack https://www.nexusmods.com/fallout4/mods/12471)

Speed
Rank 1: +10% movement speed  &  2AP/sec regen
Rank 2: +25% movement speed  &  5AP/sec regen
Rank 3: +40% movement speed  &  10AP/sec regen  &  Reduced stagger  &  Knockdown immune

Sprinting
Rank 1: -25% sprinting cost  &  -10% VATS cost
Rank 2: -50% sprinting cost  &  -20% VATS cost
Rank 3: -75% sprinting cost  &  -35% VATS cost  &  +50% movement speed while Sprinting outside Combat

Stealth
Rank 1: 30% Muffled  &  30% Shadowed Stealth  &  20% stealth field while crouched and stationary
Rank 2: 50% Muffled  &  50% Shadowed Stealth  &  50% stealth field while crouched  &  +20% Stealth movement speed
Rank 3: 90% Muffled  &  90% Shadowed Stealth  &  90% stealth field while crouched  &  +45% Stealth movement speed  &  Detect Life while crouched outside combat.
(Note: I honestly can't tell if the muffle or shadowed effects work)



While I've tested all of the enchants over several characters and nothing appeared to break or leave perma-effects on the character, I'm very amateur so if it doesn't work, try taking it off and putting it back on again.
Movement speed bonuses don't play nice with the 3rd person perspective animations.
It's been checked by the cleaner, and the only parts that alter existing records relate to the rings and the Jetpack animation edits copied from Cross Jetpack.
Made it about a year ago for personal use. Haven't played in a long while, so I'm unlikely to make any changes.  Feel free to do anything you like with it.