After looting a body, we recently received a 750gp necklace, and were specifically told that it consisted of 250gp of gold, and a 500gp Ruby set into that gold.

That seems remarkably specific, and our first assumption was that the Ruby is the right size to be a component of some particular spell.

But I found various component databases and nothing matches.

Is there any specific use for a 500gp Ruby, beyond "sell it for money"?

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    \$\begingroup\$ Official rules or just in general? \$\endgroup\$
    – SeriousBri
    Jun 18, 2021 at 8:16
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    \$\begingroup\$ I don't think I really understand the question, but probably "either."? \$\endgroup\$
    – Brondahl
    Jun 18, 2021 at 8:23
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    \$\begingroup\$ were/are you playing an official module (such as Storm King's Thunder or Lost Mines of Phandelver), a semi-official module such as the AL-legal oneshots on dmsguild, a non-official module from a 3rd party, or an entirely homebrew campaign? If it's an official module, one could expect that there is a use for the item; if it's entirely homebrew, your DM might be planning something that you don't know about yet. \$\endgroup\$ Jun 18, 2021 at 8:24
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    \$\begingroup\$ Have you already ruled it out whether it could be an enchanted item? Maybe your GM is giving you a hint and, at the same time, tries to see if you are fool enough to destroy the item and/or sell it for money instead of investigate its true value. \$\endgroup\$ Jun 19, 2021 at 8:59
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    \$\begingroup\$ Pre-written campaigns often award jewellery or art objects as loot, and include gp values next to them. The purpose of such rewards is usually just to make the players richer, but in a more flavorful and realistic way, because only looting stashes of coins might get boring and weird. \$\endgroup\$
    – Kathy Kat
    Jun 21, 2021 at 0:44

5 Answers 5


There are several spells that use rubies, generally by crushing them.

Continual flame uses 50GP of ruby dust. See Basic Rules, pg. 227

A flame, equivalent in brightness to a torch, springs forth from an object that you touch. The effect looks like a regular flame, but it creates no heat and doesn't use oxygen. A continual flame can be covered or hidden but not smothered or quenched.

Simulacrum uses 1500 gp of powdered ruby. See Basic Rules, pg. 276

You shape an illusory duplicate of one beast or humanoid that is within range for the entire casting time of the spell. The duplicate is a creature, partially real and formed from ice or snow, and it can take actions and otherwise be affected as a normal creature. It appears to be the same as the original, but it has half the creature's hit point maximum and is formed without any equipment. Otherwise, the illusion uses all the statistics of the creature it duplicates, except that it is a construct.

Forbiddance uses 1000 gp of ruby dust. See Basic Rules, pg. 243

You create a ward against magical travel that protects up to 40,000 square feet of floor space to a height of 30 feet above the floor. For the duration, creatures can't teleport into the area or use portals, such as those created by the gate spell, to enter the area. The spell proofs the area against planar travel, and therefore prevents creatures from accessing the area by way of the Astral Plane, Ethereal Plane, Feywild, Shadowfell, or the plane shift spell.

Forcecage uses 1500 gp of ruby dust. See Basic Rules, pg. 243

An immobile, invisible, cube-shaped prison composed of magical force springs into existence around an area you choose within range. The prison can be a cage or a solid box, as you choose.

Sequester, see Basic Rules, pg. 274 also uses ruby dust, using

a powder composed of diamond, emerald, ruby, and sapphire dust worth at least 5,000 gp, which the spell consumes)

And does this.

By means of this spell, a willing creature or an object can be hidden away, safe from detection for the duration. When you cast the spell and touch the target, it becomes invisible and can't be targeted by divination spells or perceived through scrying sensors created by divination spells.

Infernal calling and Summon Fiend also use rubies, but your ruby isn't valuable enough.

You could also arguably use them for magical crafting, or use them for bribery or social things.

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    \$\begingroup\$ It's worth pointing out that a 500 GP ruby doesn't necessarily get made into 500 GP of ruby dust. In real life, I'd expect the ruby dust to be worth less, because it can be made from smaller, more common rubies, and a large single ruby would be quite rare. In DnD, it is possible because ruby dust is used in spell casting that it is more valuable. \$\endgroup\$ Jun 18, 2021 at 16:43
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    \$\begingroup\$ @BillThePlatypus that line of thinking leads towards "Is an objects worth definitive or subjective?". Defining spell components by worth has always been illogical and messy due to worth and price being decided not by some universal constant but by social and economic factors. In a fantasy world that has inflated currency, does the spell still only require 500gp of Dust even if that is equivalent to only 0.2 grams due to the inflated price? As a DM sometimes you just have to set aside realism or the rules and let the players do what makes the most sense in terms of gameplay. \$\endgroup\$
    – Toddleson
    Jun 18, 2021 at 17:39
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    \$\begingroup\$ Yeah, I didn't define how much ruby dust you could get towards each spell because the books don't give a guide to crushing gems. Most games I've been in there's been a 1 to 1 ratio though. \$\endgroup\$
    – Nepene Nep
    Jun 18, 2021 at 17:52
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    \$\begingroup\$ @Toddleson Obligatory OotS: "Master, I talked the shopkeeper down to only 400 GP for the rubies!" "Great, but the spell calls for 500 GP worth, so go back in and buy more." \$\endgroup\$ Jun 18, 2021 at 21:52
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    \$\begingroup\$ @Toddleson I think I also recently saw a joke on /r/dndmemes about NPCs taking over several diamond mines and distribution centers so they could manipulate the price of diamonds for their rare spells. \$\endgroup\$
    – Nzall
    Jun 19, 2021 at 19:55

In addition to the other answers, a fantasy ruby has the same mundane uses as real ruby; bling.

If you turn up to the king's party without fancy jewellery you will stick out like a peasant, maybe even mistaken for the help!

Roleplay opportunity is often missed in favour of 'what do the rules say'.

As an example my kobold once found 500 x 10gp gems and a wolf skull in the same room. He now wears a helmet made from a gem encrusted wolf skull and looks super cool in his own imagination.

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    \$\begingroup\$ Nice frame challenge. Personally, I'd find it useful in combination with magic jar. Want to possess some noble? Make your friend wear you as a necklace to a noble party ]:-> \$\endgroup\$
    – Mołot
    Jun 18, 2021 at 10:07
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    \$\begingroup\$ "in his own imagination" I'm not sure that's imaginary... that's really super cool looking. Especially when he turns the gem encrusted wolf skull cap upside down to use as a gem encrusted wolf cup containing the blood of his enemies. Shiny blood tastes better. \$\endgroup\$
    – WernerCD
    Jun 19, 2021 at 6:37

In addition to existing answers, there are spells that require gems or crystals in general, and ruby is both. Here is the list of the spells I found from Basic Rules:

The last one can use your ruby perfectly, and and I find the form of a necklace convenient for Magic Jar.

I'll leave looking up spells from other sources as an exercise to the reader.

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    \$\begingroup\$ I'll point out that it's entirely possible that then necklace might have already had Magic Jar cast on it, and contains the soul of a potentially-evil wizard waiting to try to possess one of the members of the party! \$\endgroup\$
    – nick012000
    Jun 19, 2021 at 6:45
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    \$\begingroup\$ @nick012000 I like the way you think! \$\endgroup\$
    – Mołot
    Jun 19, 2021 at 6:55

There are several spells that require ruby dust as material components:

Your ruby allows 10 casts of Continual flame or it allows to cast Imprisonment for a 1HD creature.

One possibility is that your DM is giving this ruby as part of the components needed for one of the others spells, that has to be cast in a future part of your campaign.


Yet another alternative to the other answers, and one you touched on in your question - selling it for gold.

So the entire necklace is worth 750 gold, and the ruby alone is worth 500 gold.

The ruby weighs very little (let's be nice and say it weight around the same as a single gold piece) - so in rough numbers the ruby is worth 500x it's weight in gold (skipping exchange rates which are covered in other questions).

So how much does this actually mean?

One gold is ~1/3 of an ounce, or 50 gold weighs 1 pound.

500 gold weighs 10 pounds (there's also volume to consider, but again - not worrying about that right now).

Given carry capacity is 15 pounds per point in strength - selling the entire necklace for full value is going to give gold that weighs enough to use up a not inconsiderable percentage of a character's entire carry capacity (and if using the Variant: Encumbrance rules it's 5 pounds per point before you start suffering). In a real world situation 10 pounds is noticeable if being carried - and too much for a belt pouch!

So even without using it for a magical material component - it is a lot more portable than converting it to gold.

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    \$\begingroup\$ Adding as comment - in my games I run "gold is converted to / from more portable gems as required without any losses - if you suddenly find yourself needing a specific gem + value that you've not planned for then I'll roll for it" - but I also rarely want to track ammo due to the bookkeeping involved :-) \$\endgroup\$
    – Rycochet
    Jun 19, 2021 at 16:52

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