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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
Estate Diamond Art Deco Style Cluster Ring G + VS Diamonds 14k White Gold $305.0 35 bids 8 hours 14 minutes
14K Yellow Gold Marquise Princess & Solitaire Diamond Ring Sz 9 TDW 1CT JJ89 $299.0 1 bid 8 hours 51 minutes
VINTAGE ESTATE 18K GOLD NATURAL MEXICAN FIRE OPAL DIAMOND RING GEMSTONE $445.0 1 bid 8 hours 56 minutes
18ct Gold 18K Gold Sapphire & Diamond Vintage Ring size N $83.78 35 bids 12 hours 34 minutes
Helzburg Wedding Ring Set - Size 8 $136.69 16 bids 13 hours 12 minutes
14K Yellow Gold ~1/4C Emerald Cut Diamond 4 Prong Solitaire Ring Size 4 1/2 $177.5 3 bids 13 hours 39 minutes
Vintage Diamond Engagement Ring $500.0 1 bid 13 hours 41 minutes
Appx 0.65ctw Diamond Princess Cut Center 14k White Gold Engagement Ring $260.0 13 bids 14 hours 25 minutes
0.48Ct Genuine Natural Blue Diamond Solitaire Engagement Ring In 14K Yellow Gold $205.5 9 bids 14 hours 35 minutes
14k white gold engagement ring $610.03 10 bids 14 hours 58 minutes
Princess Cut HALO Engagement Wedding Ring Solid 14k White Gold AND DIAMONDS $112.94 6 bids 15 hours 19 minutes
$3,200 .62CT NATURAL SOLITAIRE ROUND CUT WHITE DIAMOND PLATINUM ENGAGEMENT RING $338.0 16 bids 17 hours 7 minutes
$1,700 .29CT NATURAL SOLITAIRE OLD MINE DIAMOND ENGAGEMENT RING 18K & PLATINUM $135.5 26 bids 17 hours 32 minutes
Estate 14K White Gold WEIGHED 1.03 Ct Asscher Cut Diamond Halo Ring 1.43 Cts TW $330.0 48 bids 17 hours 47 minutes
14K White Gold WEIGHED Cognac 0.57 Ct Brilliant Cut Diamond Ring 1.01 Cts Total $336.0 28 bids 17 hours 56 minutes
14k White Gold Beautiful Engagement Diamond Ring With Masonite Solitaire 4.32 Gm $649.0 4 bids 18 hours 7 minutes
14K 2-tone gold 1.47CT diamond 3-stone engagement ring w/ large diamonds size 7 $709.0 45 bids 18 hours 9 minutes
Heavy 14K white gold 1.40CT diamond wedding engagement ring size 6.25 $1050.0 59 bids 18 hours 13 minutes
Heavy Platinum 6.0CTW VS/G Marquise diamond cluster ballerina ring semi-mounting $2176.0 40 bids 18 hours 16 minutes
Estate 10K White Gold 0.40 Ct Round Blue Brilliant Cut Diamond Ring 1.00 Ct TW $107.5 22 bids 18 hours 26 minutes
Heavy 18K gold amazing 1.64CTW VS1/G diamond ring semi-mounting size 4.75, 11.8g $585.0 9 bids 18 hours 30 minutes
Estate Princess Cut Diamond 14K Elegant Engagement Ring NR $202.5 17 bids 18 hours 37 minutes
Estate 14K White Gold WEIGHED 1.03 Ct Brilliant Cut Diamond Ring 1.31 Cts Total $124.5 34 bids 18 hours 47 minutes
Estate Diamond 14K Gold Elegant Engagement Mounting Ring NR $227.5 16 bids 18 hours 52 minutes
Estate 1.51ct Diamond 14K Gold Lovely Engagement Set Ring 6.9 Grams NR $306.0 29 bids 18 hours 52 minutes
Antique 14K white gold 1.64CT VS diamond Engagement ring w 1.0ct center $1209.0 36 bids 18 hours 54 minutes
Heavy 14K white gold 1.98CT diamond engagement wedding ring size 4.75 $730.0 49 bids 18 hours 55 minutes
Antique Platinum .62CTW VS diamond wedding/engagement ring w/ .50CT ctr size 7.5 $326.0 23 bids 18 hours 57 minutes
GIA Diamond 14K Gold Elegant Solitaire Engagement Ring NR $718.0 43 bids 18 hours 59 minutes
Estate 0.45ct Diamond 14K Gold Elegant Flower Engagement Ring 5.1 Grams NR $100.0 43 bids 19 hours 25 minutes
Diamond Ring 14K GOLD 1.45ct Solitaire Princess DIAMOND Engagement Ring Vintage $1225.0 30 bids 19 hours 29 minutes
ZEI Platinum 1.15CT Princess cut diamond 3-stone wedding engagement ring sz 5.75 $331.0 16 bids 19 hours 46 minutes
Vintage 1.42ct Old European Cut Diamond Platinum Solitaire Engagement Ring NR $1113.0 40 bids 19 hours 47 minutes
Estate Diamond 14K Gold Engraved Engagement Mounting Ring 8.2 Grams NR $237.5 16 bids 20 hours 7 minutes
GIA Diamond 1.52ct Natural Pink Sapphire Platinum Elegant Engagement Ring NR $240.5 30 bids 20 hours 10 minutes
Antique Deco 1.87ct Old Cut Diamond Platinum Engagement Ring 5.0 Gr NR $1763.0 23 bids 20 hours 15 minutes
TIFFANY & CO 0.91ct Lucida Diamond E - VVS2 Platinum Engagement Ring $10,800.00 $2895.0 38 bids 20 hours 40 minutes
$1200 1/4CTTW CT REAL Diamond Engagement BAND WEDDING Ring SI Solid WHITE Gold! $152.5 51 bids 20 hours 53 minutes
F-G Color 0.50Ct (5.00mm app.) VS2 Natural Diamond Pointer Ring In 14KT Gold $104.0 14 bids 21 hours 37 minutes
G-H Color 0.55Ct (5.50mm app.) VS2 Natural Diamond Solitaire Ring In 14KT Gold $320.0 5 bids 21 hours 41 minutes
G-H Color 0.51Ct (5.50mm app.) VS2 Natural Diamond Solitaire Ring In 14KT Gold $113.5 12 bids 21 hours 49 minutes
$2600 2/3CTTW CT REAL Diamond PRINCESS WEDDING BAND 14k SI CLARITY! BRAND NEW! $256.0 33 bids 21 hours 58 minutes
2.20Ct AA Natural Blue Tanzanite With IGI Certified Diamond Ring In 14KT Gold $180.27 9 bids 22 hours 47 minutes
14KT Gold With 1.30Ct Natural Zambian Green Emerald & IGI Certified Diamond Ring $100.0 54 bids 1 day 44 minutes
Vera Wang 1 1/10 CTTW 14k $2000.0 1 bid 1 day 8 hours 56 minutes
Vintage Platinum 950 Prong Setting Diamond Engagement Ring $192.5 2 bids 1 day 9 hours 21 minutes
14k Yellow Gold 2.93ct Emerald 1.29ct Diamond Ring $405.13 9 bids 1 day 11 hours 35 minutes
0.61Ct Genuine Natural Diamond Solitaire Engagement Ring In Solid 14K White Gold $325.0 20 bids 1 day 12 hours 3 minutes
Estate 14k Yellow Gold Diamond Engagement Ring Size 5.5 3 Grams $138.5 28 bids 1 day 12 hours 46 minutes
4.60 Carat Natural Ruby 14K Solid White Gold Luxury Engagement Ring $215.5 6 bids 1 day 13 hours 17 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
Cert 1.04 Carat Fancy Vivid Brown Round Brilliant Enhanced Natural Diamond 6.54m $101.0 19 bids
50 minutes Certified 0.51 Carat J VS1 Round Brilliant Enhanced Natural Loose Diamond 4.84mm $134.5 21 bids 4 hours 48 minutes
Certified 0.58 Carat G Color Princess Natural Loose Diamond 4.86x4.78mm $167.5 7 bids 7 hours 58 minutes
Cert 0.86 Carat Canary Yellow SI1 Round Brilliant Enhanced Natural Diamond 5.95m $155.0 24 bids 8 hours 28 minutes
Certified 0.50 Carat G Color SI2 Marquise Natural Loose Diamond 7.46x3.78mm 2VG $215.39 1 bid 8 hours 48 minutes
Certified 1.38 Carat D Color Round Brilliant Enhanced Natural Diamond 7.26mm $361.0 29 bids 8 hours 58 minutes
Certified 0.48 Carat H VS2 Round Brilliant Enhanced Natural Loose Diamond 4.99mm $130.5 15 bids 10 hours 48 minutes
Cert 0.62 Carat Light Brown Yellow VS2 Round Brilliant Natural Diamond 5.36m 3VG $289.19 1 bid 10 hours 58 minutes
Certified 0.25 Carat D Color VVS2 Marquise Natural Loose Diamond 5.8x2.95mm $152.39 1 bid 11 hours 8 minutes
Certified 0.73 Carat Light Brown VS1 Princess Natural Diamond 4.84x4.77mm 2VG $375.0 6 bids 13 hours 18 minutes
GIA Certified Round Cut Natural Loose Diamond Light brown 0.32 carat SI2 Clarity $153.5 2 bids 14 hours 36 minutes
Cert 1.83 Carat Canary Yellow SI3 Round Brilliant Enhanced Natural Diamond 7.54m $305.0 21 bids 14 hours 48 minutes
Certified Natural Loose Diamond 0.52 Ct D SI1 Good Cut IGL Certificate Condition $299.99 1 bid 14 hours 52 minutes
2.61 cts. CERTIFIED Round Brilliant Gray Brown Color Loose Natural Diamond 22580 $126.0 6 bids 16 hours 48 minutes
0.98 cts. CERTIFIED Round Cut SI2 Faint Yellow Color Loose Natural Diamond 21818 $339.9 14 bids 16 hours 51 minutes
4.76 cts. CERTIFIED Round Brilliant Cut I3 Dark Gray Loose Natural Diamond 18965 $275.0 22 bids 16 hours 54 minutes
3.62 cts. CERTIFIED Round Brilliant Dark Brown Color Loose Natural Diamond 22591 $215.0 15 bids 16 hours 57 minutes
Certified 0.89 Carat J Color VVS1 Cushion Natural Loose Diamond 5.72x4.79mm $305.0 19 bids 16 hours 58 minutes
0.75 cts. CERTIFIED Round VS2 Light Grayish Yellow Loose Natural Diamond 21769 $283.0 6 bids 17 hours 2 minutes
0.55 cts CERTIFIED Round Cut I1 Vivid Sea Blue Color Loose Natural Diamond 24304 $106.0 7 bids 17 hours 6 minutes
1.82CTS 6MM VVS1 ROUND FANCY LIGHT BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $170.5 24 bids 17 hours 6 minutes
2.93 cts. CERTIFIED Round Cut I3 Reddish Black Color Loose Natural Diamond 18932 $168.5 5 bids 17 hours 13 minutes
2.82 cts. CERTIFIED Round Brilliant Dark Gray Color Loose Natural Diamond 22587 $116.5 6 bids 17 hours 18 minutes
2.84 cts. CERTIFIED Round Brilliant Cut I3 Dark Grey Loose Natural Diamond 16158 $120.5 6 bids 17 hours 28 minutes
2.35 cts. CERTIFIED Round Brilliant Gray Brown Color Loose Natural Diamond 16833 $130.3 6 bids 17 hours 32 minutes
3.49 cts. CERTIFIED Round Brilliant Cut Brown Black Loose Natural Diamond 22610 $133.8 6 bids 17 hours 38 minutes
2.90 cts CERTIFIED Round Cut I3 Blackish Brown Color Loose Natural Diamond 19589 $112.2 7 bids 17 hours 42 minutes
1.01 cts. CERTIFIED Round Vivid Peridot Green Color Loose Natural Diamond 24034 $184.5 15 bids 17 hours 46 minutes
6.03 cts. CERTIFIED Round Cut Grayish Brown Color Loose Natural Diamond 21954 $358.4 8 bids 17 hours 48 minutes
2.17 cts CERTIFIED Round Cut I3 Brownish Black Color Loose Natural Diamond 18596 $103.0 16 bids 17 hours 54 minutes
3.38 cts. CERTIFIED Round Brilliant Dark Brown Color Loose Natural Diamond 21996 $170.0 6 bids 17 hours 58 minutes
Certified 0.50 Carat D VS1 Round Brilliant Enhanced Natural Loose Diamond 5.11mm $563.99 1 bid 17 hours 58 minutes
4.69 cts CERTIFIED Round Brilliant Cut I3 Gray Color Loose Natural Diamond 18632 $257.0 7 bids 18 hours 4 minutes
2.76 cts. CERTIFIED Round Brilliant Dark Brown Color Loose Natural Diamond 22561 $148.5 6 bids 18 hours 8 minutes
2.85 cts. CERTIFIED Round Cut I3 Brownish Gray Color Loose Natural Diamond 18558 $138.8 5 bids 18 hours 14 minutes
2.33 cts. CERTIFIED Round Brilliant Cut Black Color Loose Natural Diamond 24009 $187.5 21 bids 18 hours 16 minutes
3.39 cts. CERTIFIED Round Cut I3 Brownish Gray Color Loose Natural Diamond 19737 $144.1 6 bids 18 hours 22 minutes
0.70 cts. CERTIFIED Round Brilliant Off White Color Loose Natural Diamond 24049 $113.5 8 bids 18 hours 26 minutes
2.63 cts. CERTIFIED Round Brilliant Gray Brown Color Loose Natural Diamond 22548 $170.9 6 bids 18 hours 28 minutes
Certified 0.47 Carat D VVS2 Round Brilliant Enhanced Natural Loose Diamond 4.9mm $220.5 19 bids 18 hours 28 minutes
3.68 cts CERTIFIED Round Cut I3 Blackish Brown Color Loose Natural Diamond 18658 $175.5 7 bids 18 hours 33 minutes
1.72 cts CERTIFIED Round Brilliant Cut I3 Grey Color Loose Natural Diamond 16067 $108.5 17 bids 18 hours 37 minutes
1.05 cts. CERTIFIED Diamond Shape Deep Coffee Brown Loose Natural Diamond 13759 $104.4 7 bids 18 hours 52 minutes
4.34 cts CERTIFIED Round Cut I3 Brownish Black Color Loose Natural Diamond 18610 $196.5 6 bids 18 hours 54 minutes
2.37 cts CERTIFIED Round Brilliant Cut I3 Gray Color Loose Natural Diamond 18645 $104.5 10 bids 19 hours 4 minutes
3.10 cts. CERTIFIED Round Brilliant Gray Brown Color Loose Natural Diamond 22565 $140.7 6 bids 19 hours 8 minutes
1.14 ct Natural Diamond Marquise Mixed Cut Loose Stone NR $595.0 25 bids 19 hours 10 minutes
3.33 cts CERTIFIED Round Brilliant Cut I3 Gray Color Loose Natural Diamond 19786 $123.4 6 bids 19 hours 12 minutes
3.29 cts CERTIFIED Round Brilliant Cut I3 Gray Color Loose Natural Diamond 18573 $218.5 10 bids 19 hours 14 minutes
4.25 cts. CERTIFIED Radiant Step Cut Fancy Brown Loose Natural Diamond 24057 $206.5 17 bids 19 hours 15 minutes