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Our forge cleric wanted to manufacture diamond rings and use the diamonds later for raise dead and similar spells.
Artisan's Blessing states that the end product must include some kind of metal. The metal used as material for the ritual then magically forms even the non-metal parts of the product.
Can the cleric keep using this feature to basically convert coins to diamonds?
While David offers a great answer to making it work, I'm going to offer the other side of the Artisan's Blessed coin; I don't think this is the intended purpose. Magic has a component cost for a reason, and you're trying to abuse a class feature as a loophole to get around this.
You conduct an hour-long ritual that crafts a nonmagical item that must include some metal: a simple or martial weapon, a suit of armor, ten pieces of ammunition, a set of tools, or another metal object.
A diamond ring is not a weapon, a suit of armor, a set of tools or ammunition, so it must fall under 'another metal object'. If you are making a ring purely for the diamond contained within, you're not really making a metal object, are you? Once your DM allows you to create a cheap brass ring with an expensive 99.9 GP diamond in it, this feature essentially reads "you can create any mundane object costing less than 100 gp".
Need rope? "Yeah I'm making a grappling hook with 900 feet of rope, and then I'm cutting the hook off."
Need perfume? "Yeah I'm making a perfume bottle with perfume in it, with a metal stopper."
Need a chest? "Yeah I'm making a wooden chest with a metal lock on it."
While your DM obviously has the final say in all matters, and some DMs will allow this kind of thing, the feature says you can make a metal object, not "anything you want, with some cheap metal attached."
Want to store your diamonds? You can use your artisan's blessing feature to make rings worth no more than 100 GP out of metal with an opening, and then afterwards manually add an existing diamond to it.
The Channel Divinity is fairly clear (emphasis mine):
You conduct an hour-long ritual that crafts a nonmagical item that must include some metal: a simple or martial weapon, a suit of armor, ten pieces of ammunition, a set of tools, or another metal object...
The thing you create can be something that is worth no more than 100 gp. As part of this ritual, you must lay out metal, which can include coins, with a value equal to the creation.
So, a Cleric of the Forge Domain can indeed quite literally convert metal coins into diamond rings, as long as the value of the ring is lower than 100 gp. There are no official diamond jewelry of less than 100 gp of value (the Dungeon Master's Guide lists some types of jewelry as Art Objects in Chapter 7), so whether such a low value diamond piece can be created will be up to the GM. There is no direct precedent, but a gold ring set with bloodstones is valued at 250 gp. Bloodstones are valued previously in the chapter at 50 gp which is the lowest value diamond implicitly mentioned in any spell component list. Chromatic orb:
Components: V, S, M (a diamond worth at least 50 gp)
Presumably, a 50 gp diamond set in a material less valuable than gold (for example, silver) would satisfy the 100 gp maximum. However, whether such a ring exists is entirely speculation as there is no reference for a less than 100 gp diamond ring. So a GM is perfectly within his right to deny such a creation (not that he wouldn't be if there were some obscure precedent).
Even if you could create a cheap diamond, there are only so many spells it would work with. Presumably, the diamond would be something of lower value than 100 gp (as the ring itself is 100 gp), so we're stuck with 8 possible spells:
So, for the most part, revivify is the only spell they are casting that will affect the game substantively, from my point of view (since they can make the cost up of smaller diamonds), but the rest of the time they are still paying the gold cost so abuse isn't particularly harmful to the game.
You specifically mentioned raise dead, which would not be eligible as raise dead requires a diamond of higher value (500 gp).
In conclusion: There is really only cause for concern if you expect revivify to be abused during the game to where death becomes less of a threat than you desire in the campaign. Keep in mind that revivify has a 1 minute timer, so it isn't the most effective resurrection spell especially if conflicts are designed to last longer than 1 minute.
You conduct an hour-long ritual that crafts a nonmagical item that must include some metal: a simple or martial weapon, a suit of armor, ten pieces of ammunition, a set of tools, or another metal object.
The part after the ‘:’ is not "for example", but a list of things you can do.
A brass ring with a diamond is not "another metal object", nor is it a simple or martial weapon, a suit of armor, 10 pieces of ammunition or a set of tools. So you cannot create a brass ring with a diamond in it.
Because a brass ring with a diamond is not a metal object. It is an object that contains metal.
On the other hand, a brass ring is "another metal object", so it can be created.
The requirements in this sentence combine. The object must be nonmagical. The object must include some metal. And the object must be from that list.
Ammunition that contains no metal? Banned.
Now, if you can convince your DM that small diamonds with lead weights are piece of ammunition, and that they are worth less than 100 gp, then go for it.
Whether or not this is intended, it would be fairly easy to do, based on this section of the wording:
The ritual can create a duplicate of a nonmagical item that contains metal, such as a key, if you possess the original during the ritual.
Hard to argue that a ring that is mostly metal by weight doesn't contain metal.
If you buy or craft a brass ring with a 50gp diamond inset, you should be able to duplicate that ring for as long as you have gold.
Then you toss the brass ring minus the diamond into the metal pile for the next ring and it only costs and extra 50gp.
This is only really an issue if components are hard to acquire, many DMs just have players pay the gold cost. There is still a cost.
