Osmium Bar: Weight, Size, Sparkle and Price of a Flat Bar

Square in the Osmium Institute frame, with OIC label1 / 5
Osmium flat bar2 / 5
Osmium disc in its frame3 / 5
Denominations compared4 / 5
Coin with an osmium inlay5 / 5

What an osmium bar is

Osmium is the densest of all elements at 22.59 g/cm³, a member of the platinum group and the rarest stable metal on Earth. Since 2017 it has been traded in crystalline form, and the flat bar is one of the shapes in which that crystalline osmium is sold. In the shop of the Osmium Institute the bar is listed among the single pieces of crystalline osmium, alongside discs, coin disks and squares, and is filed under tangible assets.

A flat bar is a rectangular osmium bar crystallised out of the plane. The process produces bars of different weight and different surface area, and because no two identical pieces can be grown, each bar is unique. The layer thickness deviates slightly from bar to bar, and the crystallisation time determines both thickness and sparkle. A bar is therefore not a standard-weight product: you choose a specific piece with its individual weight and price, or you state the amount you want to spend.

Physically the bar shows what sets osmium apart. One cubic centimetre weighs around 22.6 g, against 19.30 g for gold, 21.4 g for platinum and 11.34 g for lead, so even a bar of a few grams feels unexpectedly heavy for its size. The crystalline form is hard, corrosion-resistant, chemically inert and does not tarnish.

Crystalline osmium close up with a blue-silver shimmer

At a glance

Four things that define an osmium bar

Unique crystal surface

The crystal structure of osmium cannot be reproduced. Every bar is a one-off with its own physical fingerprint.

OIC certificate

Every genuine bar carries an Osmium Identification Code and is recorded in the Osmium World Database, the proof of authenticity and ownership.

No cutting surcharge

Bars are tangible-asset products: priced per gram, free of cutting surcharges and without small-quantity surcharges.

Exchangeable

Bars can be exchanged at the Osmium Institutes into other denominations free of charge, provided the desired pieces are in stock.

Denominations

Bar, disc, coin disk or square?

The shop of the Osmium Institute groups its single pieces into four categories. Every piece is listed with its own weight and its own dimensions, so the table describes forms and roles rather than fixed sizes; what is on offer changes with the available stock.

Form	Description	Role
Bar (flat bar)	rectangular flat piece crystallised out of the plane, considerably smaller than a gold bar	classic tangible-asset form, priced per gram without cutting surcharge
Disc	round flat piece with a short outer edge and a large inner area	most economical geometric form, exchange target for several bars
Coin disk	round, coin-sized	small tangible-asset piece with its own OIC
Coin disk, hexagonal	hexagonal, coin-sized	hexagonal alternative to the round coin disk
Square	square, flat, the smallest of the four categories	entry piece for small amounts

Flat bars are small, flat pieces, considerably smaller than the gold bars most people picture, and no two of them share the same weight or the same dimensions. The shop states both for every bar individually, so you always choose a specific piece rather than a standard unit. Stars and diamonds, the smallest denominations, are sold as collector’s pieces with a cutting surcharge and belong to a different shop category.

Surface and size

Sparkle, size and layer thickness of an osmium bar

Each bar is rated for the coarseness of its crystal surface, which the shop calls sparkle. The coarser the crystal structure, the stronger the sparkle; a finer structure gives a softer, more varied sparkle. How coarse the surface turns out depends on the crystallisation, so the sparkle rating is part of what makes each bar unique.

For each bar the shop also states a calculated mean layer thickness, with the note that the actual object is noticeably thicker. The actual thickness of a bar is not stated in the shop.

The shop recommends bars with a larger surface area. Flat pieces are cut by wire erosion into two-dimensional shapes, and a larger area leaves more geometric freedom if a shape is ever to be cut from the bar later on.

What does an osmium bar cost?

The price of an osmium bar follows one rule: the osmium weight of the bar multiplied by the current price per gram. Bars are tangible-asset products, so no cutting surcharge is added, and the shop prices per gram without small-quantity surcharges. The current price is €2,301 per gram net (as of 11 September 2026), which corresponds to about €71,568 per troy ounce or €2,300,980 per kilogram. Osmium bars are small pieces; the kilogram price is a calculation figure and a comparison value against other metals, not a listed single piece. For private buyers in Germany, VAT at 19 per cent is added to the net price.

The price is not set on a commodities exchange. It is fixed via the Osmium Institutes, which bring osmium into circulation in 40 countries, and the osmium world association OWC publishes the daily price on osmium-preis.com. When crystalline osmium was first quoted in 2017 the price was €528 per gram; how it has developed since is shown on the osmium price page with a chart of the development since 2017. Past price development is no indication of future prices.

Silver commemorative coin with a round inlay of crystalline osmium

Certified osmium bars, priced per gram, each with its own OIC.

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Osmium ingot, osmium bullion and osmium coin: what the terms mean

An osmium ingot is the common synonym for the osmium bar described on this page: the same rectangular flat bar of crystalline osmium under a different name. Searches for osmium bullion usually mean exactly this group of products: pieces bought for their metal weight, priced per gram and free of cutting surcharges. The shop calls them tangible-asset products and distinguishes them from collector’s pieces, the cut shapes such as diamonds, stars, triangles and hexagons made for processors. Those carry a surcharge for cutting and offcut, because they cannot be cut without waste, and the shop describes them as unsuitable for a classic tangible investment.

The shop does not list a minted osmium coin. What it lists as a coin disk is a round or hexagonal piece of crystalline osmium about the size of a coin, each with its own weight. Like the bar, its surface comes from the crystallisation process, and like the bar it carries its own OIC.

Bars, discs and coin disks can be exchanged into one another. Several flat bars can be swapped gram for gram into a disc at the Osmium Institutes free of charge; the disc is considered the most economical geometric form because of its short outer edge and large inner area. Pieces you already own can be sent to the German Osmium Institute, checked for authenticity and exchanged into the denomination you want, small pieces into large ones and vice versa, provided the desired pieces are in stock.

Round crystalline osmium disc with a violet to turquoise-silver shimmer

Storing and reselling an osmium bar

A bar concentrates high value in very little space, which makes it simple and unobtrusive to store. The recommendation on this site is to keep the osmium and its certificate in a safe or a bank deposit box. Crystalline osmium can be held physically, and storage with a custodian is optional.

The OIC is what makes a bar tradeable later. The microscopic crystal surface of every piece is scanned and stored under its code in the Osmium World Database, and after purchase the code is linked to you as the owner. Since 2021 the Osmium Marketplace has allowed certified osmium with an OIC to be resold between private individuals and dealers.

How a purchase works step by step, from choosing the form to registering the OIC, is described in the guide on how to buy osmium. If the density effect matters more to you than value per piece, the osmium cube page compares the shapes from that angle.

Certified osmium disc in a black authenticity case

Frequently asked

Osmium bar: frequently asked questions

What is an osmium bar?

A rectangular flat bar of crystalline osmium, crystallised out of the plane. Each bar has its own weight, its own dimensions and its own crystal surface, carries an Osmium Identification Code (OIC) and is recorded in the Osmium World Database.

How much does an osmium bar weigh?

There is no standard weight. Every flat bar is grown individually in the crystallisation process and has its own weight, which the shop states for each piece. Bars are small, flat pieces, considerably smaller and lighter than gold bars; their value is the osmium weight multiplied by the price per gram.

How much does an osmium bar cost?

The osmium weight of the bar multiplied by the current price per gram, currently €2,301 net (as of 11 September 2026). Bars carry no cutting surcharge; private buyers in Germany pay VAT on top of the net price.

Is there an osmium coin?

The shop does not list a minted coin. It lists coin disks: round or hexagonal pieces of crystalline osmium about the size of a coin, each with its own weight and its own OIC.

Can I exchange a bar for a disc or another denomination?

Yes, provided the desired pieces are in stock. Tangible-asset products can be exchanged at the Osmium Institutes into other denominations free of charge, small pieces into large ones and vice versa; several flat bars can be swapped gram for gram into a disc. The pieces are checked for authenticity first.

How do I know an osmium bar is genuine?

Every genuine bar has an OIC. Its microscopic crystal surface is scanned and stored under that code in the Osmium World Database, where the code is linked to the buyer as the owner after purchase.

Where should I store an osmium bar?

In a safe or a bank deposit box, together with the certificate. Crystalline osmium can be held physically; storage with a custodian is optional.

The content of this page is informational and does not constitute investment advice.

Read on

The osmium bar: crystalline osmium in its classic form