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.

diamond cup

Skip it

Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.

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

Good1,396.91

avg incumbent reviews — the moat a new listing must climb

Competition

Okay56%

top-5 click share — leaders hold, buyers still browse

Market size

Okay$254K

$254K/yr · 123K searches

Conversion

Okay3.8%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Bad-0.7%

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

Returns

Bad7.0%

return rate — above 5% kills the launch gate

Brand share

Bad96%

top-5 brand share — brand-locked demand

Signals High Returns High Price

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

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

Top-5 brand share

96%

Top 20: 100%

Top-5 click share

56%

Top 20: 98%

Open market

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.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top diamond cup search terms

diamond mma cup29K/yr -3.3%3.1% conv.
mma cup25K/yr +3.7%2.7% conv.
muay thai cup14K/yr -0.5%2.5% conv.
diamond cup10K/yr +18.1%2.7% conv.
diamond mma9K/yr +5.5%2.4% conv.
diamond cup mma6K/yr -9.7%2.9% conv.
mma cup protector men8K/yr -23.1%3.4% conv.
diamond mma cup youth3K/yr +41.1%2.5% conv.
diamond mma jock strap3K/yr -19.6%2.2% conv.
steel cup mma3K/yr -17.6%1.5% conv.

All 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.

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

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$34.364.7★862 rev

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$69.474.8★885 rev

Venum Challenger Groinguard and Support Ice Large Black

Venum$31.014.7★3,760 rev

Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Medium) Black

Diamond MMA$127.624.3★48 rev

Venum Challenger Groinguard and Support Ice Medium Black

Venum$31.624.7★3,760 rev

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$18.8065 rev

2y ago

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$18.8665 rev

2y ago

COOLOMG Men Compression Shorts with Athletic Cup Sliding Underwear for Baseball Football MMA Lacrosse Field Hockey Black M

COOLOMG$19.061,301 rev

4y ago

Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Medium) Black

Diamond MMA$127.6248 rev

4y ago

Diamond MMA Compression Performance Short with Built-in Jock Strap and Athletic Cup System (Small) Black

Diamond MMA$123.6548 rev

4y ago

What buyers say about diamond cup

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

What buyers love

Comfort-Overall21%

“Amazing comfort”

Size-Overall13%

“Fits good”

Quality-Overall11%

“Higher quality cup than what you usually find”

Protection10%

“Protecting the jewels”

Value For Money7%

“It is decent value for the money”

Advertised Vs Actual Product6%

“Work says it should”

Exercise/Sports Suitability5%

“Overall, its a reliable piece of gear and a good choice if you train boxing, MMA, or Muay Thai”

Efficiency5%

“It works”

Durability3%

“Durable, Nice quality, Comfortable”

Material Quality3%

“but the edge all the way around is softer material making all the difference”

What buyers complain about

Size-Overall26%

“Too tight”

Value For Money14%

“Price is ridiculous”

Comfort-Overall14%

“in general I don't like cups there not the most comfortable”

Hard Feel5%

“My one criticism is that the edges could be softer”

Shrinkage Resistance5%

“They shrunk a little as I expected so I bought them a little big”

Top return reasons

Size-Overall83%

Comfort-Overall3%

Advertised Vs Actual Product2%

Weight Heavy2%

Thigh Fit1%

Value For Money1%

Strap/String Quality1%

Functionality-Overall1%

Waist Fit1%

Product Condition1%

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.

diamond cup

diamond cup market data

Competition & brand share

Demand & seasonality

Top diamond cup search terms

Top diamond cup products on Amazon

Top sellers

Newest

Trending

What buyers say about diamond cup

What buyers love

What buyers complain about

Top return reasons

Common questions

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