---
title: "black mermaid birthday decorations — Niche Verdict: Skip it (31/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/clothing-shoes-jewelry/black-mermaid-birthday-decorations"
last_updated: "2026-07-13T23:28:39.601Z"
locale: en
meta:
  description: "a small market ($0/yr) — black mermaid birthday decorations doesn't clear our bar today."
  "og:description": "a small market ($0/yr) — black mermaid birthday decorations doesn't clear our bar today."
  "og:title": "black mermaid birthday decorations — Niche Verdict: Skip it (31/100) | Amazon United States - Flapen"
---

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# **black mermaid birthday decorations**

**Skip it**

A small market ($0/yr) — this niche doesn't clear our bar today.

Market size 0Growth 44Conversion 0Competition 12Returns 71Price range 60Avg price 73Brand share 26Review moat 82Quality gap 19

**Review moat**

**Great****353.56**

avg incumbent reviews — the moat a new listing must climb

**Avg price**

**Good****$14.80**

avg listing price — sweet spot $15–$100

**Returns**

**Good****2.2%**

return rate — above 6% kills the launch gate

**Price range**

**Good****$6.85–$27.44**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Growth**

**Okay****+15.4%**

90-day search growth — must beat 0% to launch

**Brand share**

**Okay****89%**

top-5 brand share — brands hold most of the demand

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Competition**

**Bad****86%**

top-5 click share — a locked-up shelf

**Market size**

**Bad****$0**

$0/yr · 8K searches

**Conversion**

**Bad****0.0%**

search→purchase rate — share of searches ending in a sale

## **Competition**

The top 5 products capture 86% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**8 **▼falling

**Sellers**

**9**

**Top-5 brand share**

**89%**

**Open market**

**6%**

- CIEHER59% - NKPDAXM9% - Linlmeet8% - Ezcpigei8% - Tutu and Sian5% - Doctor Unicorn4% - Open — no brand owns it (2 brands, 6%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%15%$030%$045%$060%$0101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 9 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![CIEHER Mermaid Crown Headband Seashell Crown for Little Mermaid Birthday Party Decorations Mermaid Accessories Halloween Costumes](https://m.media-amazon.com/images/I/41XatEB6SJL.jpg)**CIEHER Mermaid Crown Headband Seashell Crown for Little Mermaid Birthday Party Decorations Mermaid Accessories Halloween Costumes**CIEHER**$9.53**4.7★348 rev](https://www.amazon.com/dp/B0CH8C43T5) [2![Mermaid Birthday Party Supplies Black Mermaid Cake Topper Decorations for Mermaid Party Supplies Decor (B6)](https://m.media-amazon.com/images/I/413syFyU2PL.jpg)**Mermaid Birthday Party Supplies Black Mermaid Cake Topper Decorations for Mermaid Party Supplies Decor (B6)**Linlmeet**$8.89**4.5★35 rev](https://www.amazon.com/dp/B0CL3V1M6G) [3![Ezcpigei Little Mermaid Birthday Party Decoration Pack - Mermaid Birthday Banner Cake Topper Latex Balloons Cupcake Toppers](https://m.media-amazon.com/images/I/71RBk4KTUZL.jpg)**Ezcpigei Little Mermaid Birthday Party Decoration Pack - Mermaid Birthday Banner Cake Topper Latex Balloons Cupcake Toppers**Ezcpigei**$9.95**4.6★13 rev](https://www.amazon.com/dp/B0DP46SQHY) [4![NKPDAXM Mermaid Birthday Decorations Include Plates Napkins Cups Cutlery Hanging Swirls Banner Cake & Cupcake Toppers Balloons Tablecloth for Mermaid Party Decorations Serve 20](https://m.media-amazon.com/images/I/61Uu+Jf70zL.jpg)**NKPDAXM Mermaid Birthday Decorations Include Plates Napkins Cups Cutlery Hanging Swirls Banner Cake & Cupcake Toppers Balloons Tablecloth for Mermaid Party Decorations Serve 20**NKPDAXM**$22.61**4.8★189 rev](https://www.amazon.com/dp/B0F2461D1F) [5![Mermaid Outfit Set Shirt Rainbow Tutu Dress Satin Sash Headband Birthday Gifts for Girls Costume (Mermaid B2 11-12 Years)](https://m.media-amazon.com/images/I/41vB+7p2twL.jpg)**Mermaid Outfit Set Shirt Rainbow Tutu Dress Satin Sash Headband Birthday Gifts for Girls Costume (Mermaid B2 11-12 Years)**Tutu and Sian**$27.44**4.8★483 rev](https://www.amazon.com/dp/B0CKT59QZV)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![NKPDAXM Mermaid Birthday Decorations Includes Banner Backdrop Foil & Latex Balloons Hanging Swirls Cake & Cupcake Toppers Honeycomb Centerpieces for Girls Mermaid Party Decorations](https://m.media-amazon.com/images/I/51kBw7mu5YL.jpg)**NKPDAXM Mermaid Birthday Decorations Includes Banner Backdrop Foil & Latex Balloons Hanging Swirls Cake & Cupcake Toppers Honeycomb Centerpieces for Girls Mermaid Party Decorations**NKPDAXM**$17.77**163 rev1y ago](https://www.amazon.com/dp/B0F8V1B1QD) [![NKPDAXM Mermaid Birthday Decorations Include Plates Napkins Cups Cutlery Hanging Swirls Banner Cake & Cupcake Toppers Balloons Tablecloth for Mermaid Party Decorations Serve 20](https://m.media-amazon.com/images/I/61Uu+Jf70zL.jpg)**NKPDAXM Mermaid Birthday Decorations Include Plates Napkins Cups Cutlery Hanging Swirls Banner Cake & Cupcake Toppers Balloons Tablecloth for Mermaid Party Decorations Serve 20**NKPDAXM**$22.61**189 rev1y ago](https://www.amazon.com/dp/B0F2461D1F) [![Mermaid Themed Birthday Candles Number 5 Girls Glitter Birthday Party Supplies Anniversary Party Decor 2.87 inch Cake Topper Decorations (Mermaid Themed Number 5)](https://m.media-amazon.com/images/I/414rvE32lZL.jpg)**Mermaid Themed Birthday Candles Number 5 Girls Glitter Birthday Party Supplies Anniversary Party Decor 2.87 inch Cake Topper Decorations (Mermaid Themed Number 5)**fauaoy**$6.85**850 rev1y ago](https://www.amazon.com/dp/B0DMS5TBNV) [![Doctor Unicorn Birthday Girls Mermaid Outfit Set Costume Tutu Skirt Dress Mermaid Birthday Shirt Headband & Satin Sash (Black-1 3-4 Years)](https://m.media-amazon.com/images/I/41Tyjrz-5XL.jpg)**Doctor Unicorn Birthday Girls Mermaid Outfit Set Costume Tutu Skirt Dress Mermaid Birthday Shirt Headband & Satin Sash (Black-1 3-4 Years)**Doctor Unicorn**$20.21**887 rev2y ago](https://www.amazon.com/dp/B0CSMBQ951) [![Didder Mermaid Themed Party Outfit: Sash Crown and Decorations for Girls](https://m.media-amazon.com/images/I/410S5u1-1YL.jpg)**Didder Mermaid Themed Party Outfit: Sash Crown and Decorations for Girls**Didder**$9.92**214 rev2y ago](https://www.amazon.com/dp/B0CP99JZDB)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![CIEHER Mermaid Crown Headband Seashell Crown for Little Mermaid Birthday Party Decorations Mermaid Accessories Halloween Costumes](https://m.media-amazon.com/images/I/41XatEB6SJL.jpg)**CIEHER Mermaid Crown Headband Seashell Crown for Little Mermaid Birthday Party Decorations Mermaid Accessories Halloween Costumes**CIEHER**$9.53**4.7★**▲ 38%**](https://www.amazon.com/dp/B0CH8C43T5) [![Mermaid Outfit Set Shirt Rainbow Tutu Dress Satin Sash Headband Birthday Gifts for Girls Costume (Mermaid B2 11-12 Years)](https://m.media-amazon.com/images/I/41vB+7p2twL.jpg)**Mermaid Outfit Set Shirt Rainbow Tutu Dress Satin Sash Headband Birthday Gifts for Girls Costume (Mermaid B2 11-12 Years)**Tutu and Sian**$27.44**4.8★**▲ 34%**](https://www.amazon.com/dp/B0CKT59QZV) [![NKPDAXM Mermaid Birthday Decorations Includes Banner Backdrop Foil & Latex Balloons Hanging Swirls Cake & Cupcake Toppers Honeycomb Centerpieces for Girls Mermaid Party Decorations](https://m.media-amazon.com/images/I/51kBw7mu5YL.jpg)**NKPDAXM Mermaid Birthday Decorations Includes Banner Backdrop Foil & Latex Balloons Hanging Swirls Cake & Cupcake Toppers Honeycomb Centerpieces for Girls Mermaid Party Decorations**NKPDAXM**$17.77**4.6★**▲ 19%**](https://www.amazon.com/dp/B0F8V1B1QD) [![Didder Mermaid Themed Party Outfit: Sash Crown and Decorations for Girls](https://m.media-amazon.com/images/I/410S5u1-1YL.jpg)**Didder Mermaid Themed Party Outfit: Sash Crown and Decorations for Girls**Didder**$9.92**4.6★**▲ 10%**](https://www.amazon.com/dp/B0CP99JZDB) [![NKPDAXM Mermaid Birthday Decorations Include Plates Napkins Cups Cutlery Hanging Swirls Banner Cake & Cupcake Toppers Balloons Tablecloth for Mermaid Party Decorations Serve 20](https://m.media-amazon.com/images/I/61Uu+Jf70zL.jpg)**NKPDAXM Mermaid Birthday Decorations Include Plates Napkins Cups Cutlery Hanging Swirls Banner Cake & Cupcake Toppers Balloons Tablecloth for Mermaid Party Decorations Serve 20**NKPDAXM**$22.61**4.8★**▼ 18%**](https://www.amazon.com/dp/B0F2461D1F)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +15.4% search growth over the last 90 days.

1K750Black Friday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Jul, Aug, Sep · busiest ÷ quietest = 3.9×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Quality-Overall**24%

*“Its extremely well made”*

**Advertised Vs Actual Product**13%

*“Cute as Pictured”*

**Value For Money**13%

*“worth the money”*

**Brightness/Shine/Glow**12%

*“Cute birthday candle”*

**Color**11%

*“Pretty”*

**Assembly/Installation**7%

*“turned out so cute all put together”*

**Size-Overall**5%

*“It was the ideal size—substantial enough to be the focal point of the cake without completely dominating the design”*

**Durability**4%

*“The crown is adorable and felt durable”*

**Design-Overall**3%

*“Beautiful decor”*

**Ease Of Use**2%

*“Everything was easy to use”*

### **What buyers complain about **

**Defective Material/Parts**21%

*“Came broken”*

**Size-Overall**18%

*“just a little large for a 6 year old”*

**Strength**16%

*“flimsy plates”*

**Assembly/Installation**7%

*“Doesnt gonna pre assembled”*

### **Top return reasons **

**Size-Overall**51%

**Value For Money**13%

**Defective Material/Parts**10%

**Color**6%

**Quality-Overall**6%

**Advertised Vs Actual Product**4%

**Functionality-Overall**2%

**Comfort-Overall**2%

**Design-Overall**1%

**Material Quality**1%