If you have ever tried to buy a single LEGO® brick online, you may have hit a strange wall: the shape was easy to find, but suddenly you were faced with a dozen different colours, two different names for the same shade, and a price that jumped tenfold for one of them. Welcome to the wonderful, slightly confusing world of LEGO® colours.
Colour is one of the most important and most misunderstood parts of the LEGO® hobby. The same humble 2x4 brick can be common in red and genuinely sought-after in a retired earth tone. This guide explains which LEGO® colours are rare and why, how the official and BrickLink names map onto each other, and how to make sure you order the exact shade you need every time. Looking for a full list? Our LEGO® colour guide shows every colour in our catalogue with its BrickLink name, number and RGB value.
How LEGO® colours work: names and ID codes
Every LEGO® element is defined by two things: its shape (the mould) and its colour. The LEGO Group gives each colour its own official name and a numeric colour ID. So a part is never just "a 2x4 brick" internally; it is a specific mould in a specific colour ID, and that combination is what makes up a unique element.
This matters more than beginners expect. The same mould exists in dozens of colours, and not every colour is produced in every shape. A part might be everyday-common in one colour and have only ever appeared in a handful of sets in another. Because of that, colour is one of the biggest drivers of a part's value and rarity, often more than the shape itself.
If you are still getting to grips with how parts are catalogued, our guide on finding LEGO® part numbers pairs neatly with this one. The part number tells you the shape; the colour tells you the rest.
Official names vs community (BrickLink) names
Here is the single biggest source of confusion in the whole hobby. LEGO® has its own official colour names, but the community, led largely by the BrickLink marketplace, often uses different names for the very same shade. Both are "correct" in their own world, which is exactly why people get tripped up.
The classic example is grey. What LEGO® officially calls Medium Stone Grey, the community calls Light Bluish Gray. What LEGO® calls Dark Stone Grey is widely known as Dark Bluish Gray. Same plastic, two vocabularies. Blue works the same way: what LEGO® calls Earth Blue is Dark Blue on BrickLink.
A few quick rules of thumb:
- LEGO® official names tend to be more descriptive and "corporate" (Bright Red, Medium Stone Grey, Earth Green).
- Community and BrickLink names tend to be shorter and more hobbyist-friendly (Red, Light Bluish Gray, Dark Green).
- When buying parts, always check which naming system a shop uses, and compare with a photo if you are unsure. The colour numbers differ too: Medium Stone Grey is 194 at LEGO® and 86 on BrickLink, so check which numbering a shop uses.
At CrocoBricks we list parts by colour so you can match the exact element you are after, but it always pays to know both names when you are hunting across different sources. Our colour guide lists each colour with its BrickLink name and number.
The great grey change of 2004
No colour guide is complete without the story that still haunts older builders. Around 2004, LEGO® quietly changed its grey and dark grey to slightly bluer tones (the ones the community calls Light and Dark Bluish Gray). The earlier, warmer shades are now known as "old grey" or "old light gray". Brown changed at the same time: the old Brown made way for the redder Reddish Brown.
The two greys look almost identical in isolation but clash noticeably side by side. If you are restoring or expanding a pre-2004 set, this is the detail that catches people out: you order "grey" and the new pieces don't quite match. When completing an older model, always confirm whether you need the old or new grey before you buy.
Colour families at a glance
LEGO® colours group into a handful of families. Knowing the family helps you talk about a shade even when you can't remember its exact name.
| Colour family | Examples | Notes |
|---|---|---|
| Basic / solid | Red, Blue, Yellow, White, Black | The everyday workhorses. Common, affordable and produced across most moulds. |
| Earth tones | Dark Red, Sand Green, Dark Tan, Reddish Brown, Olive Green | Muted, natural shades. Several are limited to fewer sets, so rarity climbs fast. |
| Transparent | Trans-Clear, Trans-Red, Trans-Light Blue, Trans-Neon Green | Used for windows, lights and jewels. Some neon trans colours are surprisingly scarce. |
| Metallic / chrome | Metallic Gold, Metallic Silver, Pearl Gold, Chrome shades | Premium-feel finishes. Chrome in particular is rare and easily scuffed. |
| Glow / phosphorescent | Glow in the Dark, Glow in Dark Trans | Charge under light and glow in the dark. Niche, limited and collectible. |
These families also matter for storage and sorting. If you keep a varied collection, our tips on organising LEGO® parts work best when you sort by colour family as well as by shape.
Retired and rare colours: why they get valuable
LEGO® regularly retires colours. When a shade is discontinued, no new parts are made in it, so the existing supply slowly shrinks as bricks get lost, broken or locked away in collections. Basic supply and demand does the rest, and some retired colours become genuinely prized.
A few names that collectors watch:
- Maersk Blue: a soft, distinctive blue tied to a small number of sets and instantly recognisable.
- Old (pre-2004) Brown: replaced by Reddish Brown, so it only exists in older parts.
- Old (pre-2004) greys: valuable simply because they can no longer be matched with new production.
- Certain chrome and trans-neon shades that only ever showed up in a handful of elements.
Prices for these shift constantly with demand, so it is worth checking current listings rather than relying on old figures. The key takeaway: a part's colour can matter far more to its value than its shape. If you are filling gaps in a model, see our guide on replacing missing LEGO® pieces to plan your hunt.
How to identify a colour when ordering
Getting the colour right is the difference between a clean repair and a piece that sticks out forever. A reliable approach:
- Check the set's parts list. Official inventories name the exact colour used, which removes the guesswork entirely.
- Compare in daylight. Screens and indoor lighting distort colour badly. Natural light is your friend, especially for greys, tans and dark earth tones.
- Watch out for close pairs. Old vs new grey, Tan vs Dark Tan, and Reddish Brown vs old Brown are easy to confuse.
- Translate the name. If a shop uses official names and you only know the community name (or vice versa), map between them before you commit.
- Mind authenticity. Off-colour or oddly shiny parts can be a red flag; our guide on spotting fake LEGO® parts covers what to look for.
If you are unsure which shape you even need before worrying about colour, our overview of LEGO® piece names is a good starting point.
Colour-matching tips for completing a set
When you are finishing a build, consistency is everything. Buy all the pieces of one colour from a single source where you can, so the batch matches. Be honest with yourself about condition too: used parts can yellow or fade slightly over time, particularly whites and trans colours, so a brand-new part beside an older one may not blend perfectly. For visible, front-facing areas, prioritise an exact colour match; for hidden internal structure, you have more freedom to use whatever you have to hand.
Frequently asked questions
Why does the same LEGO® colour have two different names?
Because LEGO® uses its own official names while the community and BrickLink use their own. For example, Medium Stone Grey (official) is the same shade as Light Bluish Gray (community). Always check which system a shop uses.
What is the difference between old grey and new grey?
Around 2004 LEGO® shifted its greys to slightly bluer tones. The older, warmer greys are called "old grey" and don't match modern production, which matters when restoring pre-2004 sets.
Why are some LEGO® colours so expensive?
When a colour is retired, no new parts are produced in it, so supply shrinks over time. Rare retired shades like Maersk Blue or the old Brown can become quite collectible as a result.
How do I find out the exact colour of a part in my set?
Check the set's official parts inventory, which lists the precise colour name, then compare the physical part in daylight to be sure before ordering.
Does colour really affect a part's value more than its shape?
Often, yes. A common shape in a rare or retired colour can be worth far more than the same shape in a basic colour, so naming the colour correctly when you order really matters.
Ready to find the exact shade you need? Browse our LEGO® parts collection at CrocoBricks, where parts are listed by colour so you can match your build precisely, whether you are chasing a common red or a hard-to-find retired earth tone.
LEGO® is a trademark of the LEGO Group, which does not sponsor, authorise or endorse this site. CrocoBricks is an independent reseller and is not affiliated with the LEGO Group.
