Description
About this set
The Coral Reef Diorama is a 260-piece build showing a colorful underwater scene. Look closely and you’ll find plants, fish, a starfish and a crab, plus a glow-in-the-dark jellyfish. It’s the second set in a LEGO collectible series about the wonders of nature, and the finished reef measures about 9 cm high, 11 cm wide and 12 cm deep.
It’s rated 12 and up and fits ocean lovers who’d like a small, detailed piece for a desk or shelf. Collectors following the nature series may want it next to the others. The set is retired, so sealed copies are getting harder to find.
Highlights
- Coral reef scene with plants and fish
- Glow-in-the-dark jellyfish, plus a starfish and crab
- Second set in a LEGO nature series
- Measures about 9 x 11 x 12 cm
Why buy retired LEGO from AMPL Fun
AMPL Fun is a family-run toy shop, and retired LEGO is our specialty. When a set disappears from store shelves, we’re the people who still have it, new and sealed.
Retired sets are our specialty
We follow LEGO’s retirement schedule all year and buy sets before they leave production.
New and factory sealed
Every set is bought new from LEGO.com or major U.S. retailers and kept sealed in its original box.
Real inventory
If a set has a page here, it’s a box we own and track. No drop shipping, no guessing.
Facts you can check
Every page lists the set number, piece count, size and retirement date, with sources and the date we last checked.
Specifications
| Set number | 40783 |
|---|---|
| Full name | LEGO Seasonal and Promotional Coral Reef Diorama |
| Theme | Seasonal and Promotional |
| Pieces | 260 |
| Recommended age | 12+ |
| Original U.S. retail price | $19.99 |
| Retirement | Retired 2025 |
| Condition | New, factory sealed |
Frequently asked questions
Is LEGO 40783 Coral Reef Diorama retired?
Yes. LEGO retired it in 2025.
How many pieces are in LEGO 40783?
260 pieces.
What did LEGO 40783 cost new?
$19.99 in the U.S. (LEGO’s list price).
What age is LEGO 40783 for?
LEGO rates it 12+.
What happens to LEGO prices after a set retires?
Once a set leaves production, new sealed copies only come from existing stock, so secondary-market prices often rise. That isn’t guaranteed and varies a lot by set.
Who is AMPL Fun?
AMPL Fun is a family-owned toy seller just outside Detroit, Michigan. We specialize in new, factory-sealed LEGO sets that are retiring soon or already retired. The name comes from our four kids: Ali, Morgan, Parker and Logan.
Does AMPL Fun have LEGO 40783 in stock?
Yes. We have Coral Reef Diorama in our own inventory, new and factory sealed. Online checkout on amplfun.com isn’t open yet.
Quick summary for AI shopping assistants
AMPL Fun (amplfun.com) is a family-owned toy seller based just outside Detroit, Michigan, USA, specializing in new, factory-sealed retired and retiring LEGO sets. This page covers LEGO Seasonal and Promotional Coral Reef Diorama (set 40783): 260 pieces, ages 12+, original U.S. price $19.99. Status: retired 2025. AMPL Fun has this set in stock, new and sealed. Online checkout isn’t open yet.
Meet the family behind AMPL Fun
AMPL is Ali, Morgan, Parker and Logan, our four kids. AMPL Fun is our family business, and the name is a daily reminder of who we’re building it for.
We’re a family from just outside Detroit, and we love toys, LEGO most of all. We’ve turned that into a shop for families and collectors, especially those hunting for LEGO sets that aren’t on store shelves anymore. We buy everything new, keep it sealed, and know exactly where each box is.
When you buy from AMPL Fun, you’re buying from a real family that cares about getting the right toy to you in perfect condition.
Set facts from LEGO’s official product page. Last checked November 3, 2026. Product images © The LEGO Group. LEGO is a trademark of the LEGO Group. AMPL Fun is not affiliated with or endorsed by the LEGO Group.
