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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
925 Sterling Silver & 1.95Ct Round Shape 100% Natural Royal Blue Tanzanite Ring $103.5 8 bids
10 minutes 14KT Gold & 1.50Ct Natural Zambian Green Emerald With IGI Certified Diamond Ring $374.99 1 bid 2 hours 3 minutes
1.80 Carat D/VVS1 Round Shape Solitaire With Accents Ring In 14KT Yellow Gold $189.99 1 bid 2 hours 47 minutes
1.90Ct 100% Natural African Blue Topaz & IGI Certified Diamond Ring In 14KT Gold $374.99 1 bid 2 hours 53 minutes
14KT Gold With 1.35Ct Natural Zambian Green Emerald & IGI Certified Diamond Ring $364.99 1 bid 2 hours 57 minutes
2.76ctw Lab-Created Diamond Halo Engagement Ring 14k White Gold Size 7.5 $570.0 2 bids 6 hours 7 minutes
2.55ctw Lab-Created Round Cut Diamond Engagement Ring 14k White Gold Size 5.5 $566.0 5 bids 6 hours 11 minutes
VINTAGE 1940s 14k Yellow Gold Diamond Blue Enamel Ring Sz. 6 $579.0 1 bid 6 hours 14 minutes
Vintage 18ct Platinum Emerald and Diamond Trilogy Engagement Ring size M $250.0 8 bids 6 hours 38 minutes
1.86ct 14k White Gold Diamond Engagement Ring SI2 Clarity G Color 1.50ct Center $3000.0 1 bid 12 hours 40 minutes
Zales pre-owned engagement ring size 8 princess cut diamond $500.0 1 bid 12 hours 55 minutes
4.23 Carat Natural Emerald and Diamond 14K White Gold Engagement Ring $265.0 24 bids 13 hours 4 minutes
2.26 Carat Genuine Peridot 14K Solid Yellow Gold Diamond Ring $112.5 13 bids 13 hours 4 minutes
1.63 Carat Genuine Emerald 14K Solid Yellow Gold Diamond Ring $102.5 35 bids 13 hours 14 minutes
1.26Ct Genuine Natural Mined Emerald And Diamond Ring In Solid 14K Rose Gold $171.08 21 bids 14 hours 12 minutes
White Gold,.5 carat diamond ring Princess size 7 $400.0 1 bid 14 hours 24 minutes
2.49 Carat Natural Emerald 14K White Gold Diamond Ring $225.49 21 bids 14 hours 54 minutes
2.02 Carat Natural Ceylon Sapphire 14K White Gold Diamond Ring $217.49 19 bids 15 hours 14 minutes
Diamond engagement ring, 1.00 CT, Emerald cut, white gold band with 22 brilliant $2750.0 1 bid 15 hours 16 minutes
$5,500 1.21CT 3 STONE NATURAL DIAMOND & BLUE SAPPHIRE PLATINUM ENGAGEMENT RING $820.0 26 bids 17 hours 38 minutes
IGI Certified 1.18 Carat Lab-Created Round Diamond Solitaire Ring 14k White Gold $445.0 20 bids 17 hours 49 minutes
$4,200 .54CT NATURAL SOLITAIRE ROUND CUT DIAMOND ENGAGEMENT PLATINUM RING $455.0 12 bids 18 hours 2 minutes
Estate 14K Yellow, White Gold WEIGHED 0.55 Ct Cushion Cut Diamond Solitaire Ring $224.72 30 bids 18 hours 34 minutes
14k White Gold .73 Carat Diamond Full Eternity Band Size 5 $510.0 38 bids 18 hours 49 minutes
Estate Diamond 0.47 Carat Ladies Vintage Engagement Ring Circa 1930's $2249.09 1 bid 19 hours 56 minutes
GIA CERTIFIED 0.60CT ROUND NATURAL DIAMOND 14K GOLD CLASSIC SOLITAIRE RING VVS2 $202.5 18 bids 21 hours 52 minutes
GIA CERTIFIED 0.50CT ROUND D/VVS1 NATURAL DIAMOND 14K WHITE GOLD SOLITAIRE RING $142.5 32 bids 21 hours 54 minutes
925 Sterling Silver & 4.34Ct AA Natural Earthmined Black Diamond Solitaire Ring $212.5 3 bids 22 hours 50 minutes
925 Sterling Silver 3.49Ct Round Shape AA Natural Black Diamond Solitaire Ring $222.5 4 bids 23 hours 4 minutes
14Kt White Gold & 2.30Ct Natural Bluish Gray Diamond Solitaire With Accents Ring $356.0 20 bids 23 hours 18 minutes
10k Solid Gold 1.0 Ct Natural Diamond Ring !!! Not Scrap !!! $206.5 25 bids 1 day 19 minutes
GIA CERTIFIED 3.58CT NATURAL ROUND DIAMOND ENGAGEMENT RING 18K WG J/VVS1 $8100.0 35 bids 1 day 1 hour 10 minutes
Zales Disney Enchanted Belle 1 1/4ct diamond 14k wht gold Engagement Ring 6.5 $1000.0 2 bids 1 day 7 hours 46 minutes
Light Fancy Brilliant Cut 1.24ct Diamond Ring Size 6.5 $600.0 2 bids 1 day 9 hours 19 minutes
14K Yellow Gold Natural Princess Cut Diamond Engagement Ring $550.0 54 bids 1 day 11 hours 49 minutes
4.80 Carat Natural Tanzanite 14K White Gold Diamond Ring $455.0 22 bids 1 day 12 hours 44 minutes
2.26 Carat Genuine Aquamarine 14K Solid White Gold Diamond Ring $202.5 27 bids 1 day 12 hours 54 minutes
5.02 Carat Natural Zircon 14K Solid Yellow Gold Diamond Ring $264.0 17 bids 1 day 14 hours 24 minutes
14K WG 2.62 Ct Ruby with Diamonds Halo Ring! Think Diana & Sarah! $199.0 1 bid 1 day 15 hours 9 minutes
2.72 Carat Natural Pink Sapphire 14K White Gold Diamond Ring $227.49 10 bids 1 day 15 hours 14 minutes
3 Carat Pink Diamond Moissanite 14kt Solid Yellow Gold Size 7 Ring $340.0 2 bids 1 day 15 hours 23 minutes
6.43 grams of solid 14k gold wedding band and engagement ring, size unknown! $141.5 13 bids 1 day 15 hours 45 minutes
2.05 Carat Beautiful Authentic Engagement Diamond Ring $530.0 4 bids 1 day 17 hours 26 minutes
Vintage 14k Yellow Gold Diamond-.24 tcw Band Fine Ring-Size 5 $119.0 1 bid 1 day 17 hours 28 minutes
14kt Gold 1.17 ct Round Brilliant Diamond Ring $335.0 13 bids 1 day 17 hours 44 minutes
Size 8 Antique 14K White Gold 1/2 Carat Diamond Engagement Ring ~ 2.0 Grams $157.5 9 bids 1 day 19 hours 28 minutes
0.55ct Genuine Natural Diamond Solitaire Engagement Ring In 14K Yellow Gold $123.5 21 bids 1 day 20 hours 9 minutes
David Yurman Sterling Silver 0.31c Diamond Albion w/14mm Blue Topaz ring Size 7 $258.0 3 bids 1 day 22 hours 31 minutes
2.27 Lab Created Emerald/Genuine Diamond 10kt Solid Yellow Gold Ring Size 7 $220.0 1 bid 1 day 23 hours 26 minutes
Absolutey Stunning 18k (750) Mens White Gold Red Spinel Ring/Diamond Accents $867.76 1 bid 2 days 4 hours 42 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
0.89 Carat Fancy Brown Round Brilliant Natural Loose Diamond For Jewelry 5.94mm $102.5 16 bids 3 hours 47 minutes
Certified 1.50 Carat I SI3 Round Brilliant Enhanced Natural Diamond 7.03mm 3VG $434.0 9 bids 4 hours 47 minutes
Certified 1.19 Carat L SI2 Round Brilliant Enhanced Natural Diamond 6.75mm 3VG $270.0 19 bids 10 hours 37 minutes
0.23ct Diamond Round Brilliant Cut Loose Stone NR $135.5 20 bids 11 hours 18 minutes
GIA 0.63ct Diamond Old European Brilliant Cut Loose Stone NR $660.0 25 bids 11 hours 18 minutes
GIA 0.50ct N color Very Light Brown Diamond Round Brilliant Cut Loose Stone NR $173.5 19 bids 11 hours 18 minutes
Certified 1.00 Carat D VS2 Round Brilliant Enhanced Natural Loose Diamond 6.1mm $740.0 14 bids 11 hours 19 minutes
Certified 0.41 Carat D SI1 Round Brilliant Enhanced Natural Loose Diamond 4.68mm $177.32 1 bid 12 hours 26 minutes
Certified 0.79 Carat F SI1 Round Brilliant Enhanced Natural Diamond 5.95m EX CUT $424.0 11 bids 13 hours 56 minutes
Loose natural Diamond Radiant 1.04 ct VVS1 Fancy Light Green $214.5 17 bids 15 hours 33 minutes
Loose natural Diamond Rounds 2.04 Ct (2 diamonds 1.02 Ct Each) VS1 Yellow color $103.5 10 bids 15 hours 34 minutes
Loose natural Diamond Round 1.07 Ct VVS1 Fancy Blue color $105.0 17 bids 15 hours 35 minutes
Loose natural Diamond Cushion 1.04 Ct (2 diamonds) VVS1 Fancy Blue $107.5 8 bids 15 hours 36 minutes
Loose natural Diamond Round 1.05 ct Flawless Fancy Light Pink $117.5 15 bids 15 hours 38 minutes
Certified 1.32 Carat F SI3 Round Brilliant Natural Loose Diamond $202.49 18 bids 15 hours 51 minutes
Certified 1.65 Carat K VS1 Round Brilliant Enhanced Natural Loose Diamond 7.05mm $895.0 8 bids 15 hours 56 minutes
2.28 cts. CERTIFIED Round Cut Grayish Brown Color Loose Natural Diamond 23718 $118.5 4 bids 17 hours 5 minutes
3.21 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 22663 $125.8 4 bids 17 hours 9 minutes
0.45 cts. CERTIFIED Round Brilliant Light Gray Color Loose Natural Diamond 24986 $108.0 6 bids 17 hours 13 minutes
1.00CTS 6MM VVS2 EMERALD UNTREAT FANCY YELLOW CERTIFIED LOOSE NATURAL DIAMOND $118.5 5 bids 17 hours 16 minutes
3.18 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 22638 $166.0 3 bids 17 hours 19 minutes
2.29 cts. CERTIFIED Round Cut I3 Brownish Gray Color Loose Natural Diamond 20364 $126.3 2 bids 17 hours 21 minutes
0.55 cts. CERTIFIED Round Brilliant Off White Color Loose Natural Diamond 25092 $116.0 4 bids 17 hours 21 minutes
0.59 cts. CERTIFIED Round Cut I1 Fancy White Color Loose Natural Diamond 23101 $135.0 4 bids 17 hours 31 minutes
0.32 cts. CERTIFIED Round SI1 Vivid Sky Blue Color Loose Natural Diamond 24173 $131.5 6 bids 17 hours 43 minutes
0.18 cts. CERTIFIED Round SI3 Vivid Leaf Green Color Loose Natural Diamond 27489 $121.5 6 bids 17 hours 47 minutes
1.61 cts. CERTIFIED Round Cut I1 Brownish Gray Color Loose Natural Diamond 21835 $373.1 4 bids 17 hours 49 minutes
0.23 cts. CERTIFIED Round VS2 Sparkly Intense Yellow Loose Natural Diamond 23452 $110.4 4 bids 17 hours 51 minutes
4.54 cts. CERTIFIED Round Cut I3 Brownish Gray Color Loose Natural Diamond 18631 $241.0 4 bids 17 hours 55 minutes
2.88 cts. CERTIFIED Round Brilliant Brown Gray Color Loose Natural Diamond 22562 $140.5 4 bids 17 hours 59 minutes
0.51 cts CERTIFIED Round Brilliant Cut White-I Color Loose Natural Diamond 25039 $143.0 4 bids 18 hours 1 minute
2.89 cts CERTIFIED Round Brilliant Cut I3 Gray Color Loose Natural Diamond 18987 $119.5 5 bids 18 hours 5 minutes
2.90 cts CERTIFIED Round Cut I3 Blackish Brown Color Loose Natural Diamond 19589 $114.0 4 bids 18 hours 9 minutes
0.53 cts. CERTIFIED Round Cut SI2 Faint Brown Color Loose Natural Diamond 23145 $112.0 4 bids 18 hours 11 minutes
0.68 cts. CERTIFIED Round Vivid Peridot Green Color Loose Natural Diamond 24028 $161.0 6 bids 18 hours 13 minutes
3.66 cts CERTIFIED Round Cut I3 Blackish Brown Color Loose Natural Diamond 16015 $205.6 5 bids 18 hours 15 minutes
0.72 cts. CERTIFIED Round Cut I2 Vivid Orangish Red Loose Natural Diamond 27498 $213.0 6 bids 18 hours 17 minutes
0.46 cts. CERTIFIED Round I1 Vivid Royal Blue Color Loose Natural Diamond 24260 $134.5 6 bids 18 hours 23 minutes
0.82 cts. CERTIFIED Round Brilliant Cut Fancy White Loose Natural Diamond 25005 $185.8 4 bids 18 hours 31 minutes
6.13 cts. CERTIFIED Round Brilliant Cut Black Brown Loose Natural Diamond 22617 $301.1 14 bids 18 hours 39 minutes
0.30 cts. CERTIFIED Round SI1 Vivid Intense Yellow Loose Natural Diamond 24810 $109.5 20 bids 18 hours 43 minutes
0.70 cts. CERTIFIED Round Brilliant Cut I3 White-H Loose Natural Diamond 19343 $108.9 2 bids 19 hours 11 minutes
2.41 cts. CERTIFIED Round Cut Brownish Gray Color Loose Natural Diamond 21989 $138.6 4 bids 19 hours 19 minutes
0.53 cts CERTIFIED Round Brilliant Cut White-H Color Loose Natural Diamond 25018 $127.1 4 bids 19 hours 21 minutes
0.52 cts. CERTIFIED Round Cut I1 Faint Brown Color Loose Natural Diamond 24708 $122.5 6 bids 19 hours 23 minutes
2.19 cts. CERTIFIED Round Cut I3 Grayish Brown Color Loose Natural Diamond 18929 $112.1 4 bids 19 hours 25 minutes
1.75 cts. CERTIFIED Round Brilliant Dark Gray Color Loose Natural Diamond 14337 $102.5 2 bids 19 hours 31 minutes
0.52 cts. CERTIFIED Round I1 Vivid Royal Blue Color Loose Natural Diamond 23126 $116.8 4 bids 19 hours 31 minutes
0.99CTS 6MM VVS2 HEART UNTREAT F COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $180.27 3 bids 19 hours 51 minutes
2.82 cts. CERTIFIED Round Brilliant Dark Gray Color Loose Natural Diamond 22587 $118.5 4 bids 19 hours 59 minutes