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eBay
Popularity: 
As the largest online auction site, eBay has a huge number of diamond jewelries for auction every day.
There are various diamond jewelry for auction you can find on eBay. Of course, diamond ring is the most popular item in the category, but you can also find good number of diamond earrings, diamond bracelet, and diamond necklace to bid for.
If you are only interested in loose diamonds, you can also find many of them available for auction on eBay. The website has a sub category specifically for loose diamonds, and you can find loose diamond auctions on eBay by following the link.
Gem Rock Auctions
Popularity: 
Gem Rock Auctions is a highly popular auction site for gem stones, and it has many loose diamonds for auction every day.
Examples of auctioned diamonds include 1.06 cts fancy colored diamonds, 1.02 cts fancy intense yellow natural diamond, 1 ct round brilliant cut white diamond, certified electric blue 0.48 ct diamond, and GIL certified 0.80 cts natural white diamond.
According to the website, Gem Rock Auctions has sold over 500,000 individual gemstones to the bidders.
Shop Good Will
Popularity:
Shop Good Will often has an impressive list of diamond jewelry for auction.
Common items for auctions include diamond bracelets, diamond necklaces, diamond pedants, diamond rings, and loose diamonds.
Shop Good Will is the ecommerce arm of Goodwill, a leading nonprofit organization for educational and work-related services. Goodwill has over 3,300 local stores across America.
EBTH
Popularity:
EBTH stands for Everything but The House, and it's a hugely popular online auction site with diamond jewelry for auctions.
Examples of auctioned diamond jewelry include 14K 5.41 ct emerald and diamond halo ring, Israel Gady Shemesh 18K 1.92 ctw gypsy set diamond band, platinum 2.02 ctw diamond stud earrings, Lose 0.92 ct round brilliant cut diamond with GIA online report, 14K 3.36 ctw diamond band, 14K 3.12 ctw diamond stud earrings, 14K 4.52 ctw diamond ring, and 14K 3.42 ctw diamond ring with Milgrain shoulders.
Shop LC
Popularity: 
Shop LC has a vast online auction category with many diamond jewelry to bid for every day.
Popular categories include diamond rings, diamond earrings, diamond pendants, diamond bracelets, and more.
PoliceAuctions.com
Popularity:
PoliceAuctions.com is an auction site with many buyers. The site has a good number of diamond jewelry for auction.
PoliceAuctions.com has a separate category specifically for "big diamonds". When we visited the site, we found auctioned diamond jewelry like IGL certified 14K solid yellow gold 3/4 carat marquise cut diamond solitaire ring, IGL certified 14K white gold 1/2 carat diamond earrings, IGL certified 14K solid white gold 1/5 ctw diamond solitaire ring, and IGL certified 14K solid white gold 3/4 ctw diamond solitaire ring.
JTV Auctions
Popularity:
JTV Auctions is the auction arm of JTV, one of the largest retailers in the US, with live TV programs available to 84 million households.
You can often find a diverse list of diamond jewelry to bid for at JTV auctions at any time.
Property Room
Popularity: 
Property Room is a very popular auction site with some diamond jewelry for auction.
From diamond rings to diamond earrings, you can find various diamond jewelry to bid for.
According to the website, Property Room works with 4,300 law enforcement agencies and municipalities to auction goods.
Jewelry-Auctioned.com
Popularity:
Jewelry-Auctioned.com is an online jewelry auction site with some diamond jewelry to bid for.
According to the website, Jewelry-Auctioned.com has over 190,000 members, and sold 30,000 individual pieces of jewelry for auction bidders.
Top Hatter
Popularity:
Top Hatter is a highly popular online auction site. From time to time, you can find some diamond jewelry to bid for.
Most diamond jewelry auctioned on TopHatter are inexpensive, and the bidding often starts from $1. So, if you want to bid for fine diamond jewelry with high price tag, TopHatter isn't the ideal choice. But you are looking for an inexpensive diamond jewelry to bid for as an entertaining experience, you may take a close look at TopHatter.
Popular Diamond Ring Auctions on eBay Ending Soon - $100 or More
3.66 Carat Natural Ruby 14K White Gold Diamond Ring $1380.0 18 bids
37 minutes 3.11 Carat Natural Sapphire 14K White Gold Diamond Ring $1380.0 14 bids 1 hour 28 minutes
1.12Ct Genuine Natural Diamond Solitaire Engagement Ring, Solid 14K Yellow Gold $570.0 26 bids 2 hours 14 minutes
14k Yellow Gold I-J/I1 2.08ct Diamond Engagement Ring Sz 6 $12,300 $2000.0 1 bid 2 hours 14 minutes
White Diamond Halo Ring With Cognac Colored Diamond Center $310.0 2 bids 2 hours 26 minutes
Vintage 14k WHITE GOLD 3 Stone Round Diamond .41 TCW Engagement Ring 6.5 5.2g $219.5 36 bids 4 hours 11 minutes
Estate 14K Yellow Gold 0.25 Ct Round Brilliant Cut Diamond Ring 0.60 Cts Total $208.5 26 bids 4 hours 23 minutes
1930s Vintage 14K Yellow Gold 0.10 Ct European Cut Diamond Ring 0.25 Cts Total $201.0 20 bids 4 hours 42 minutes
10.75cts 14.82mm Natural Black Diamond Ring AAA Grade & $5575 Value. $120.5 6 bids 4 hours 58 minutes
Estate 14K Yellow, White Gold 0.20 Ct Brilliant Cut Diamond Ring 0.30 Cts Total $318.0 14 bids 5 hours 7 minutes
platinum diamond ring $721.0 23 bids 5 hours 8 minutes
Genuine 14kt White Gold Diamond Engagement Ring 1ct Size 7 & 6.9g #17 $300.0 45 bids 5 hours 13 minutes
1940s 14K WHITE GOLD WEDDING SET W / 13 ROUND NATURAL DIAMONDS VS Quality $142.5 20 bids 5 hours 47 minutes
Blue Nile Round Brilliant Cut Diamond Engagement Ring 1.23ct $8550.00 $3050.0 31 bids 6 hours 28 minutes
2.40Ct Natural Zambian Emerald & IGI Certified Diamond Ring In 14KT White Gold $107.5 12 bids 8 hours 37 minutes
14KT White Gold 1.55Ct 100% Natural Zambian Emerald & White Accents Diamond Ring $167.5 15 bids 10 hours 37 minutes
Vintage 1/4ctw 14k Gold Plat Top Diamond Engagement Wedding Band Ring Suite $255.99 22 bids 18 hours 21 minutes
Solid 14k White Gold 3.10Ct White Round Cut VVS1 Halo Diamond Engagement Ring $199.0 1 bid 18 hours 30 minutes
14 kt - Solitaire Ring - white gold $150.0 1 bid 19 hours 12 minutes
9ct Gold Amethyst & Diamond Hallmarked Cluster Ring size R $94.0 6 bids 23 hours 5 minutes
1.5ctw Natural Diamond G-SI1 Halo Engagement Ring 14K Solid White Gold Size7 New $575.0 25 bids 23 hours 34 minutes
Gold Wedding Ring Marked 750 (18 kt) Gold,Size 6 1/4-6 1/2,2.5 Grams,1/4 Diamond $101.0 2 bids 23 hours 46 minutes
14K Yellow Gold ~3/8C Marquise Diamond 6 Prong Solitaire Ring Size 6 $150.0 1 bid 23 hours 50 minutes
14k White Gold ~1/3C Round Diamond 4 Prong Solitaire Modernist Wedding Set Sze 6 $250.0 1 bid 23 hours 54 minutes
“18ct Yellow Gold & Diamond 0.37ct Cluster Ring” Very Pretty $106.0 19 bids 23 hours 54 minutes
conflict free diamond engagement ring and wedding band bridal set size 4.5 $215.0 2 bids 1 day 20 minutes
6.13 Carat Natural Emerald and Diamond 14K White Gold Engagement Ring $128.0 6 bids 1 day 47 minutes
7.04 Carat Natural Zircon 14K Solid White Gold Diamond Ring $255.0 8 bids 1 day 57 minutes
AMERICUS 14K White Gold 0.90 Ct Yellow Brilliant Cut Diamond Ring 1.10 Ct Total $330.0 25 bids 1 day 5 hours 2 minutes
1.70Ct Natural Zambian Green Emerald With White Diamond Ring In 14KT White Gold $102.5 8 bids 1 day 8 hours 37 minutes
3.04 Ct Princess Cut SI1/E Solitaire Diamond Engagement Ring 14K White Gold $2897.0 2 bids 1 day 16 hours 40 minutes
1.3 Ctw Jared Blue Sapphire & Diamond Solid 14k White Gold Engagement Ring, Sz 6 $240.0 1 bid 1 day 18 hours 4 minutes
diamond engagement ring $360.0 5 bids 1 day 18 hours 16 minutes
VINTAGE ESTATE 14K GOLD DIAMOND RING APPRAISAL BEZEL SET SOLITAIRE .45 CT VVS2 $785.0 1 bid 1 day 18 hours 19 minutes
Antique 18ct Gold Five Stones Old Cut Diamonds Ring, Size P1/2 $104.0 2 bids 1 day 19 hours 3 minutes
Neil Lane 1/2 Carat Ct Diamond Wedding Anniversary Ring Band 14k White Gold sz 8 $429.99 1 bid 1 day 19 hours 24 minutes
14k Rose Gold Engagement Ring And Wedding Band Set ** Size 7 ** $713.0 1 bid 1 day 19 hours 31 minutes
1.60 ct Vintage Antique Old European Cut Diamond Engagement Ring in Platinum $2601.0 39 bids 1 day 19 hours 45 minutes
10k Diamond Ring $150.0 1 bid 1 day 21 hours 46 minutes
4.04 Carat Natural Ruby 14K Solid Yellow Gold Luxury Engagement Ring $255.0 18 bids 1 day 23 hours 52 minutes
10K Yellow Gold ~1/2CTW Round Diamond 3 Stone Side Accent Ring Size 7 1/4 $177.5 3 bids 1 day 23 hours 54 minutes
14K 2.5ctw Diamond Wedding Set HUGE 1.25ct Princess Cut Diamond Center 2pc $765.0 13 bids 2 days 3 hours 45 minutes
ART CARVED .48 CTTW DIAMOND 14KT ENGAGEMENT & WEDDING RING SET SZ 6 TW 6.60 gr $205.5 17 bids 2 days 3 hours 57 minutes
Tiffany & Co. Platinum & Diamond, Ribbon Engagement Ring,1.07ct F VVS2 MSRP 26K $4650.0 22 bids 2 days 7 hours 10 minutes
Preowned Halo Diamond Framed Engagement Ring size 7 3/4 Carats 14k WG Estate $290.0 10 bids 2 days 16 hours 34 minutes
diamond ring $486.0 35 bids 2 days 21 hours 7 minutes
Cartier Engagement Ring - Cartier C De Cartier 0.50 Carat Diamond Solitaire 18ct $275.0 61 bids 2 days 21 hours 54 minutes
Tiffany & Co. 0.42 Carat Diamond Engagement Ring 18ct Yellow Gold RRP £4000 + $481.0 31 bids 2 days 22 hours 9 minutes
14K White Gold Round Cut Solitaire Diamond Ring, 1.01 TCW, 2.7 Grams, Size 9 $1599.99 1 bid 2 days 22 hours 30 minutes
1 ct diamond engagement ring 10k white gold $180.0 1 bid 2 days 22 hours 47 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
Loose natural Diamond Round 1.04 ct SI2 F color $227.5 17 bids
12 minutes Loose natural Diamond Marquise 0.92 Ct Flawless Fancy Yellow Color $374.9 22 bids
15 minutes Loose natural Diamond Marquise 1.02 Ct (2 diamonds) Flawless Fancy Blue Color $404.0 17 bids
24 minutes Loose natural Diamond Round 0.99 (20 diamonds) Ct VS1 I Color $126.5 14 bids
48 minutes 1.74CTS 7MM VS1 ROUND UNTREAT G COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $237.06 8 bids
57 minutes Cert 0.58 Carat Reddish Brown VVS2 Round Brilliant Enhanced Natural Diamond 5.4m $344.0 4 bids
59 minutes 2.41 CTS 8MM VVS2 ROUND FANCY BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $125.5 6 bids 1 hour 2 minutes
3.12 CTS 9MM VS1 EMERALD FANCY GREEN LAB CERTIFIED LOOSE NATURAL DIAMOND $255.0 10 bids 1 hour 7 minutes
Loose natural Diamond Princess 1.01 ct VS1 F Color $334.0 36 bids 1 hour 9 minutes
Loose natural Diamond Rounds 1.00 Ct (10 Diamonds ) SI2 F Color $176.5 30 bids 1 hour 14 minutes
1.71 CTS 7MM VVS2 ROUND UNTREAT INTENSE YELLOW CERTIFIED LOOSE NATURAL DIAMOND $134.69 6 bids 1 hour 17 minutes
Loose natural Cushion Diamond 1.01 Ct VVS1 H $1609.0 37 bids 1 hour 24 minutes
Loose natural Diamond Round 1.01 Ctw (1.9 mm diamonds) VS1 Fancy Yellow $142.5 15 bids 1 hour 39 minutes
Cert 1.02 Carat Fancy Brown Round Brilliant Natural Loose Diamond 6.25mm 3VG $177.5 6 bids 1 hour 49 minutes
1.14CTS 5MM VVS1 PRINCESS UNTREAT F COLOR WHITE CERTIFIED LOOSE NATURAL DIAMOND $107.5 20 bids 1 hour 57 minutes
1.66CT 7MM VS1 ROUND UNTREAT FANCY CHAMPAGNE LAB CERTIFIED LOOSE NATURAL DIAMOND $102.5 14 bids 2 hours 2 minutes
0.94CTS 6MM VVS2 ROUND UNTREAT G COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $269.0 15 bids 2 hours 7 minutes
Cert 0.60 Carat Yellow Brown SI1 Round Brilliant Enhanced Natural Diamond 5.37mm $104.03 13 bids 2 hours 8 minutes
1.02CTS 6MM VS1 CUSHION FANCY VIVID ORANGE LAB CERTIFIED LOOSE NATURAL DIAMOND $125.5 16 bids 2 hours 12 minutes
3.08CT 8MM VS1 OCTAGONAL FANCY GREENISH BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $100.0 8 bids 2 hours 22 minutes
2.96CTS 8MM VS1 EMERALD FANCY LIGHT GREEN LAB CERTIFIED LOOSE NATURAL DIAMOND $330.0 4 bids 2 hours 32 minutes
3.10 cts. CERTIFIED Round Brilliant Gray Brown Color Loose Natural Diamond 22565 $140.7 6 bids 3 hours 1 minute
0.76 cts. CERTIFIED Round I1 Vivid Royal Blue Color Loose Natural Diamond 25345 $230.4 11 bids 3 hours 3 minutes
3.15 cts. CERTIFIED Round Brilliant Brown Gray Color Loose Natural Diamond 22662 $125.1 8 bids 3 hours 7 minutes
2.31 cts. CERTIFIED Round Brilliant Cut I3 Dark Gray Loose Natural Diamond 18620 $107.0 6 bids 3 hours 7 minutes
0.36 cts. CERTIFIED Round Brilliant Cut SI1 White-H Loose Natural Diamond 25480 $132.9 10 bids 3 hours 9 minutes
0.54 cts. CERTIFIED Round Brilliant Cut I1 Off White Loose Natural Diamond 25044 $136.8 6 bids 3 hours 9 minutes
5.97 cts. CERTIFIED Round Brilliant Brown Gray Color Loose Natural Diamond 22558 $387.9 7 bids 3 hours 12 minutes
0.46 cts CERTIFIED Round Brilliant Cut White-H Color Loose Natural Diamond 25008 $118.5 6 bids 3 hours 30 minutes
0.54 cts CERTIFIED Round Brilliant Cut White-I Color Loose Natural Diamond 25080 $110.3 6 bids 3 hours 39 minutes
0.79CTS 6MM VVS2 OVAL FANCY DEEP RED LAB CERTIFIED LOOSE NATURAL DIAMOND $270.0 4 bids 3 hours 47 minutes
2.66 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 16853 $146.7 7 bids 3 hours 51 minutes
0.53 cts. CERTIFIED Round SI3 Vivid Sea Green Color Loose Natural Diamond 23127 $134.6 6 bids 3 hours 53 minutes
2.86 cts. CERTIFIED Round Cut Grayish Brown Color Loose Natural Diamond 22051 $172.5 8 bids 3 hours 55 minutes
1.05CTS 6MM VVS1 CUSHION UNTREAT INTENSE YELLOW CERTIFIED LOOSE NATURAL DIAMOND $212.5 10 bids 3 hours 57 minutes
0.51 cts. CERTIFIED Round I1 Vivid Royal Blue Color Loose Natural Diamond 25368 $115.6 6 bids 3 hours 59 minutes
2.03 cts CERTIFIED Round Cut I3 Blackish Brown Color Loose Natural Diamond 15996 $140.5 6 bids 4 hours 5 minutes
5.41 cts. CERTIFIED Pear Brilliant Cut Black Color Loose Natural Diamond 14814 $333.1 15 bids 4 hours 7 minutes
3.22 cts. CERTIFIED Round Brilliant Brown Gray Color Loose Natural Diamond 22576 $100.3 6 bids 4 hours 7 minutes
0.54 cts. CERTIFIED Round Cut Vivid Royal Blue Color Loose Natural Diamond 25400 $129.5 6 bids 4 hours 9 minutes
0.72 cts. CERTIFIED Round Brilliant Cut SI3 White-K Loose Natural Diamond 24046 $163.0 15 bids 4 hours 15 minutes
3.07 cts. CERTIFIED Round Brilliant Dark Gray Color Loose Natural Diamond 22609 $126.9 6 bids 4 hours 17 minutes
0.27 cts. CERTIFIED Round Brilliant Cut VS2 White-H Loose Natural Diamond 25443 $100.3 6 bids 4 hours 19 minutes
0.28 cts CERTIFIED Round Cut SI1 Vivid Golden Yellow Loose Natural Diamond 21314 $108.5 6 bids 4 hours 19 minutes
0.33 cts. CERTIFIED Round Brilliant Cut SI1 White-J Loose Natural Diamond 24424 $121.5 12 bids 4 hours 21 minutes
0.75 cts. CERTIFIED Round VS2 Light Grayish Yellow Loose Natural Diamond 21769 $283.0 8 bids 4 hours 21 minutes
3.18 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 22638 $163.1 6 bids 4 hours 27 minutes
0.84 cts. CERTIFIED Round Cut Vivid Ocean Blue Color Loose Natural Diamond 25382 $181.6 6 bids 4 hours 29 minutes
0.34 cts. CERTIFIED Round Brilliant Cut SI1 White-J Loose Natural Diamond 24400 $167.5 11 bids 4 hours 31 minutes
0.66 cts. CERTIFIED Round I3 Vivid Royal Blue Color Loose Natural Diamond 18827 $100.3 6 bids 4 hours 33 minutes