By Gideon Vance, longtime Dungeon Master and gemstone dice collector. Last reviewed July 2026.
How much do D&D dice weigh? For dice of the same size, the answer is set almost entirely by one number: the material's density. Acrylic plastic — the standard starter-set material — is the light baseline at about 1.18 g/cm³. Glass and natural gemstone dice are roughly twice as dense, so a same-size stone d20 weighs about twice its plastic twin. Solid zinc-alloy metal dice sit at the far end at around 6.6 g/cm³, five to six times the weight of acrylic. That single fact explains almost every difference you feel when you pick up a new set: why a gemstone d20 lands in the palm with authority, why a metal set makes a bag sag, and why hollow metal dice feel surprisingly featherweight. This guide puts the numbers in one chart and walks through what they mean at the table.
Density decides dice weight
Weight is volume times density, and standard polyhedral dice in a given set are all cut or cast to comparable sizes — so when two same-size dice weigh differently, the material is the whole story. Density is also why weight is such a useful clue about what a die is actually made of: you cannot fake heft. A resin die painted to look like stone still weighs like resin, which is exactly the tell our real-or-fake gemstone guide leans on. The chart below lists the density of each common dice material and what that works out to relative to an acrylic die of the same size.
Dice weight by material: the chart
Multipliers are density ratios — a same-size die in the listed material weighs about that many times an acrylic one. Densities are the standard published values for each material family.
Plastic dice: acrylic and resin
Acrylic — poly(methyl methacrylate), the same polymer sold as Plexiglas — has a published density of 1.18 g/cm³, and epoxy resin lands in the same light neighborhood, varying a little with the formula. This is why a full seven-piece plastic set disappears into a pocket and why plastic dice are the quietest to roll. Cast resin differs from acrylic in how it is made rather than how much it weighs; glitter layers, liquid cores, and other inclusions nudge the weight up only slightly. If your "mystery" die feels light, it is almost certainly one of these two plastics.
Glass and gemstone dice: about twice plastic
Soda-lime glass — the everyday glass family — runs around 2.5 g/cm³, and K9 optical crystal, the cut-glass material used in many "crystal" dice sets, sits in the same range. Natural quartz-family gemstones such as amethyst, tiger's eye, and aventurine are published at a specific gravity of about 2.65 — see the quartz reference — which makes a stone die a bit more than twice the weight of a same-size acrylic one. That doubled mass is most of what people mean by "premium feel": the die presses into the palm, settles faster, and stays put. It is also why stone and glass dice feel cold — more mass soaks up more heat from your skin, a physics quirk we unpack in why gemstone dice feel cool to the touch. Note that hardness is a separate axis from weight: quartz stones sit high on the Mohs scale, but a heavy die is not automatically a hard one.
Metal dice: the heavyweights — unless they are hollow
Most solid metal dice are cast from zamak, a zinc-based alloy with a density of about 6.6 g/cm³ — five to six times acrylic and comfortably heavier than any natural stone used for dice. A solid metal d20 announces itself the moment you pick it up, and a full solid-metal set is the one configuration heavy enough that a dice tray stops being optional: those dice will dent a bare wooden table. Hollow metal dice are the deliberate exception. They keep the metal look and the cool touch but are cast as a thin shell around an air core, so most of the volume weighs nothing — which is why a hollow metal d20 can feel lighter than glass and why they are the lightest sets in our own catalog's shipping listings. If you want metal's presence without wrist fatigue or table damage, hollow is the compromise the chart can't show you at a glance.
Size multiplies weight faster than you expect
Material sets the density, but size sets the volume — and volume grows with the cube of the die's dimensions. Double a die's edge length and you get eight times the volume, and therefore eight times the weight in the same material. This is why oversized "chonk" d20s feel so dramatically heavier than their standard-sized siblings, and why the effect compounds brutally in dense materials: an oversized stone or metal die combines a 2× or 6× density multiplier with a volume multiplier on top. It also cuts the other way. Mini dice in heavy materials exist precisely because shrinking the die claws back the weight that stone and metal add, giving you the material feel in a set that still travels light. When you compare listed weights while shopping, always check the die size first — a small difference in millimeters moves the grams more than the material swap you were actually comparing.
Why dice weight matters at the table
Weight changes play in three practical ways. Feel: heavier dice give each roll a deliberate, satisfying drop, which is a big part of why players trade up from starter plastic — and part of what you pay for, as our gemstone dice price breakdown shows. Behavior: a heavier die carries less bounce; it tends to tumble shorter and settle sooner, where light plastic skitters. Logistics: a heavy set needs a tray to protect tables (and, for soft stones, to protect the dice themselves), and a bag of several metal sets is a genuinely heavy bag. None of this changes the math of the roll — a balanced die is fair at any weight — so the right weight is purely the one that feels best in your hand.
| Material | Density (g/cm³) | Weight vs same-size acrylic die | How a set feels |
|---|---|---|---|
| Acrylic (PMMA plastic) | 1.18 | 1× (baseline) | Light and quiet — the standard starter-set feel |
| Epoxy resin | ≈1.1–1.3 (varies by formula) | ≈1× | Light; glitter, foil, and liquid cores add only a little |
| Hollow metal | thin metal shell around air | often lighter than glass | Metal look and cool touch at featherweight |
| Glass, incl. K9 optical crystal | ≈2.5 | ≈2× | Cool, solid, noticeably hefty |
| Quartz-family gemstone (amethyst, tiger's eye, aventurine) | ≈2.65 | ≈2.2× | Distinctly heavy in the palm — the classic premium heft |
| Solid zinc alloy (zamak) | ≈6.6 | ≈5–6× | By far the heaviest; a dice tray stops being optional |
Frequently Asked Questions
Which dice material is the heaviest?
Solid zinc-alloy (zamak) metal, at about 6.6 g/cm³ — five to six times the weight of a same-size acrylic die and well above any natural stone used for dice. Hollow metal dice are the opposite case: a thin shell around air, often lighter than glass.
Are gemstone dice heavier than resin dice?
Yes, noticeably. Quartz-family gemstones such as amethyst and tiger's eye have a specific gravity of about 2.65, while resin and acrylic sit around 1.1 to 1.3 — so a same-size stone die weighs a bit more than twice its plastic counterpart.
How many grams does a metal dice set weigh?
Exact grams vary with die size and style, so honest sellers quote ranges rather than one number. The reliable rule is the ratio: solid zinc-alloy dice weigh five to six times same-size acrylic, glass and stone about twice, and hollow metal often less than glass.
Why are hollow metal dice so light?
They are cast as a thin metal shell around an air core, so most of the die's volume weighs nothing. You keep the metallic look, sound, and cool touch at a fraction of solid metal's weight — they are the lightest sets in our catalog's shipping listings.
Do heavier dice roll better or more fairly?
No. Fairness comes from accurate shape and evenly distributed mass, not total weight. Heavier dice do behave differently — less bounce, shorter tumbles, faster settling — and many players prefer that feel, but a balanced die is fair at any weight.
Can I use weight to spot fake gemstone dice?
It is one of the best quick clues. Real stone weighs about twice as much as a same-size resin fake, so a 'gemstone' die that feels light is suspect. Pair the weight check with the cold-touch test and a close look at the finish before judging.