---
title: "Diamond Cup — $254K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/sports-outdoors/diamond-cup"
last_updated: "2026-08-06T20:39:07.820Z"
locale: en
meta:
description: "Niche score 41/100 · $254K/yr market · 123K searches/yr · $55.14 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $254K/yr market · 123K searches/yr · $55.14 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Diamond Cup — $254K/yr Amazon US Niche (2026) - Flapen"
---
# **diamond cup**
**Skip it**
Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.
Market size 47Growth 25Conversion 47Competition 48Returns 18Price range 74Avg price 91Brand share 11Review moat 53Quality gap 47
**Avg price**
**Great****$55.14**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$13.26–$127.62**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****1,396.91**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$254K**
$254K/yr · 123K searches
**Conversion**
**Okay****3.8%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-0.7%**
90-day search growth — must beat 0% to launch
**Returns**
**Bad****7.0%**
return rate — above 5% kills the launch gate
**Brand share**
**Bad****96%**
top-5 brand share — brand-locked demand
**Signals**[** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, diamond cup is a $254K/yr Amazon United States market (123K searches/yr). The top 5 brands hold 96% of demand. Verdict: Skip it — 41/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diamond cup market data**
- **Units sold / yr**
- **4K–5K**
- avg 100–250/product
- **Revenue / yr**
- **$221K–$276K**
- units × avg price
- **Conversion rate**
- **3.8%**
- **Avg BSR**
- **#38**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **82%**
- **Out of stock**
- **1.3%**
- **Avg brand age**
- **65 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **▼falling
**Sellers**
**15**
**Top-5 brand share**
**96%**
Top 20: 100%
**Top-5 click share**
**56%**
Top 20: 98%
**Open market**
**1%**
- Diamond MMA68% - Venum15% - Shock Doctor6% - COOLOMG4% - ZHENGTU3% - Fairtex3% - Open — no brand owns it (1 brand, 1%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -0.7% search growth over the last 90 days.
4K3KSpike '24Black Friday '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/sports-outdoors/diamond-cup/trend)
## **Top diamond cup search terms**
- **diamond mma cup**29K/yr-3.3%3.1% conv. - **mma cup**25K/yr+3.7%2.7% conv. - **muay thai cup**14K/yr-0.5%2.5% conv. - **diamond cup**10K/yr+18.1%2.7% conv. - **diamond mma**9K/yr+5.5%2.4% conv. - **diamond cup mma**6K/yr-9.7%2.9% conv. - **mma cup protector men**8K/yr-23.1%3.4% conv. - **diamond mma cup youth**3K/yr+41.1%2.5% conv. - **diamond mma jock strap**3K/yr-19.6%2.2% conv. - **steel cup mma**3K/yr-17.6%1.5% conv. [**All search terms **](https://flapen.com/research/us/sports-outdoors/diamond-cup/search-terms)
## **Top diamond cup products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$25K20%$51K30%$76K40%$102K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 22 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Diamond MMA Adult Athletic Cup Groin Protector w/Soft Rim | Adult Groin Guard for High Impact Sports Combat Sports Like MMA BJJ Boxing Muay Thai | Shock Absorbent No-Shift Sports Cups for Men**Diamond MMA**$34.36**4.7★862 rev](https://www.amazon.com/dp/B00CKY0VIK) [2**Diamond MMA Jock Strap + Athletic Cup for Men - Medium | 4-Strap No Shift Athletic Supporters for Men with Cup for MMA Boxing Muay Thai Wrestling Jiu Jitsu | High Impact Sports Jockstrap and Guard**Diamond MMA**$69.47**4.8★885 rev](https://www.amazon.com/dp/B00D2XGBUK) [3**Venum Challenger Groinguard and Support Ice Large Black**Venum**$31.01**4.7★3,760 rev](https://www.amazon.com/dp/B00Q0EMNHS) [4**Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Medium) Black**Diamond MMA**$127.62**4.3★48 rev](https://www.amazon.com/dp/B09CLGYZP4) [5**Venum Challenger Groinguard and Support Ice Medium Black**Venum**$31.62**4.7★3,760 rev](https://www.amazon.com/dp/B00Q0EMNF0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**ZHENGTU Groin Protector Cup Kickboxing Boxing Muaythai MMA Groin Guard Jockstrap Karate Training BJJ Protection Soccer Basketball Removable TPE Cup with Silicone Cushioning (Black M)**ZHENGTU**$18.80**65 rev2y ago](https://www.amazon.com/dp/B0DB11PPBP) [**ZHENGTU Groin Protector Cup Kickboxing Boxing Muaythai MMA Groin Guard Jockstrap Karate Training BJJ Protection Soccer Basketball Removable TPE Cup with Silicone Cushioning (Black L)**ZHENGTU**$18.86**65 rev2y ago](https://www.amazon.com/dp/B0DB13C5YP) [**COOLOMG Men Compression Shorts with Athletic Cup Sliding Underwear for Baseball Football MMA Lacrosse Field Hockey Black M**COOLOMG**$19.06**1,301 rev4y ago](https://www.amazon.com/dp/B09P9Y3FSG) [**Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Medium) Black**Diamond MMA**$127.62**48 rev4y ago](https://www.amazon.com/dp/B09CLGYZP4) [**Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Small) Black**Diamond MMA**$123.65**48 rev4y ago](https://www.amazon.com/dp/B09CLH6X36)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Medium) Black**Diamond MMA**$127.62**4.3★**▲ 62%**](https://www.amazon.com/dp/B09CLGYZP4) [**Diamond MMA Compression Performance Short with Built-in Jock Strap (Medium) Black**Diamond MMA**$90.29**3.0★**▲ 51%**](https://www.amazon.com/dp/B09CLNXJ1T) [**Diamond MMA Compression Shorts Jock Strap Athletic Cup Groin Protector System - XL | Athletic Supporters for Men with Cup for High Impact Sports | Compression Shorts w/ Built In Jockstrap with Cup**Diamond MMA**$97.54**4.7★**▲ 38%**](https://www.amazon.com/dp/B00CKXYWI6) [**Diamond MMA Jock Strap + Athletic Cup for Men - XL | 4-Strap No Shift Athletic Supporters for Men with Cup for MMA Boxing Muay Thai Wrestling Jiu Jitsu | High Impact Sports Jockstrap and Guard**Diamond MMA**$69.18**4.8★**▲ 34%**](https://www.amazon.com/dp/B00D2XGFQK) [**Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Small) Black**Diamond MMA**$123.65**4.3★**▲ 30%**](https://www.amazon.com/dp/B09CLH6X36)
**~~View all trending →~~**
## **What buyers say about diamond cup**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Comfort-Overall**21%
*“Amazing comfort”*
**Size-Overall**13%
*“Fits good”*
**Quality-Overall**11%
*“Higher quality cup than what you usually find”*
**Protection**10%
*“Protecting the jewels”*
**Value For Money**7%
*“It is decent value for the money”*
**Advertised Vs Actual Product**6%
*“Work says it should”*
**Exercise/Sports Suitability**5%
*“Overall, its a reliable piece of gear and a good choice if you train boxing, MMA, or Muay Thai”*
**Efficiency**5%
*“It works”*
**Durability**3%
*“Durable, Nice quality, Comfortable”*
**Material Quality**3%
*“but the edge all the way around is softer material making all the difference”*
### **What buyers complain about **
**Size-Overall**26%
*“Too tight”*
**Value For Money**14%
*“Price is ridiculous”*
**Comfort-Overall**14%
*“in general I don't like cups there not the most comfortable”*
**Hard Feel**5%
*“My one criticism is that the edges could be softer”*
**Shrinkage Resistance**5%
*“They shrunk a little as I expected so I bought them a little big”*
### **Top return reasons **
**Size-Overall**83%
**Comfort-Overall**3%
**Advertised Vs Actual Product**2%
**Weight Heavy**2%
**Thigh Fit**1%
**Value For Money**1%
**Strap/String Quality**1%
**Functionality-Overall**1%
**Waist Fit**1%
**Product Condition**1%
## **Common questions**
- **Is diamond cup profitable to sell on Amazon United States?**
- The niche generates $254K/yr across 22 tracked products. 90-day search growth is -0.7%. Flapen's verdict: Skip it (41/100).
- **How competitive is the diamond cup niche?**
- 7 brands and 15 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 96% of demand.
- **What do buyers complain about in diamond cup?**
- Top complaints mined from reviews: Size-Overall, Value For Money, Comfort-Overall. The return rate is 7.0% — above our launch gate.
- **When does demand for diamond cup peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the diamond cup niche?**
- Listings span $13.26–$127.62; the average listing price is $55.14 (sweet spot $15–$100). The average incumbent carries 1,397 reviews — the moat a new listing must climb.
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