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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
10k White Gold Diamond Ring 4 Diamonds Marked 10K JED 3.91 Grams size 7 EUC $130.0 4 bids
19 minutes vintage diamond engagement ring set $600.0 3 bids
25 minutes 14k Diamond vintage engagement ring 32ct. VVS1= E with EGL papers $505.0 2 bids
33 minutes Verragio 14k White Gold & Diamond Engagement Ring INS-7070R w/ Cubic Zirconia $500.0 1 bid 1 hour 2 minutes
Stunning Genuine Diamond & Blue Sapphire Engagement/ Wedding Set-14K White Gold $2650.0 1 bid 1 hour 11 minutes
Disney Enchanted Engagement ring PLUS band. (Aurora) $1675.0 1 bid 2 hours 20 minutes
Vintage NEI 14K Yellow Gold Diamond Ring Cluster Coctail Size 7 weight 7.5g A648 $312.0 16 bids 3 hours 12 minutes
Stunning 9 ct Yellow Gold Sapphire and Diamond Ring $99.0 2 bids 3 hours 38 minutes
Emerald Cut Diamond Solitaire (Lab Grown) Engagement ring $3000.0 1 bid 5 hours 23 minutes
Incredible deal! Engagement ring and eternity band set. $8000.0 1 bid 6 hours 18 minutes
1.02 Ct Heart Cut I1/F Solitaire Diamond Engagement Ring 14K White Gold $763.0 1 bid 6 hours 25 minutes
vintage diamond engagement ring size 7 $525.0 14 bids 6 hours 49 minutes
lab grown diamond engagement ring $3000.0 1 bid 6 hours 52 minutes
Vintage 14k Yellow Gold Diamond-.79 tcw Band Fine Engagement Ring-Size 5.5 $450.0 5 bids 7 hours 3 minutes
Kurt Wayne 9mm Akoya Pearl with Round Diamond Halo Ring 18k Yellow Gold Sz 8.75 $699.99 1 bid 7 hours 49 minutes
New princess engagement ring, 180 diamonds. gold, silver, & rose gold. Size 5.5 $215.5 2 bids 9 hours 20 minutes
Tsavorite Ring Yellow Gold Diamond 14K Natural GIA Certified 2.95CTW Octagonal $1012.0 80 bids 9 hours 21 minutes
Disney Enchanted Zales diamond wedding ring set Elsa snowflake engagement ring $3000.0 1 bid 10 hours 9 minutes
14K YELLOW GOLD OLD EUROPEAN CUT ~1/2CT SOLITAIRE ART DECO DIAMOND RING SZ 2.25 $264.0 12 bids 10 hours 55 minutes
Diamond Engagement Ring 1/2 ct tw Round-cut 10K White Gold from Kay Jewelers $185.0 1 bid 11 hours 8 minutes
Estate 14K Yellow Gold 0.45 Ct Marquise Cut Diamond Ring 0.51 Cts Total $375.0 23 bids 11 hours 10 minutes
Natural Tanzanite & Diamond Ring 14K Solid White Gold 1.12tcw Fine Gemstone Ring $230.5 55 bids 11 hours 15 minutes
1940s Vintage 14K White Gold 0.23 Ct Brilliant Cut Diamond Ring 0.30 Cts Total $157.5 11 bids 11 hours 30 minutes
engagement ring $280.0 2 bids 11 hours 51 minutes
14K WHITE GOLD PRINCESS CUT CLASSIC ENGAGEMENT DIAMOND RING 1.04 CARATS $899.0 1 bid 12 hours 24 minutes
Antique White Gold Engagement (18k) & Wed Band Set J/K Color SI1 to 2 Clarity $12700.0 1 bid 12 hours 29 minutes
1.35ct Real Fancy Blue Natural Diamond Engagement Ring Set 18K White Gold Size 7 $3000.0 1 bid 13 hours 26 minutes
14K SOLID GOLD SOLITAIRE RING W / .36 CT ROUND BRILLIANT CUT NATURAL DIAMOND $125.0 17 bids 13 hours 47 minutes
Antique 14k Yellow Gold Round Cut .40ct Diamond Engagement Ring 2.9g $216.5 39 bids 13 hours 55 minutes
$2300 14K WHITE GOLD 1/2CT OFFSET REAL Diamond ETERNITY BAND WEDDING Ring! WOW $232.5 50 bids 14 hours 32 minutes
5.25 Ct GIA Certified 100% Natural Tanzanite Diamond Ring 14KT Gold RETAIL $8500 $215.5 36 bids 15 hours 3 minutes
1.52 Ct Round Cut VS1/F Solitaire Diamond Engagement Ring 14K White Gold $630.0 8 bids 21 hours 40 minutes
NATURAL EMERALD 10X7 EMERALD SAPPHIRE DIAMOND CUT STERLING SILVER 925 RING $125.0 1 bid 1 day 1 hour 19 minutes
Neil Lane Marquis Diamond Engagement Ring 3/4 CTW White Gold $561.0 8 bids 1 day 2 hours 25 minutes
Diamond White Gold Engagement Ring Set Size 5,5 With Certificate $1499.0 19 bids 1 day 4 hours 12 minutes
4- 10kt Yellow / White Gold Ring Lot Sz3-6 And Diamond Accent Pendants $202.5 12 bids 1 day 4 hours 25 minutes
10kt Yellow Gold Large Gemstone Ring Size 7 Men’s/ Women’s $102.5 4 bids 1 day 4 hours 27 minutes
0.55ct Genuine Mined Diamond Solitaire Engagement Ring In Solid 14K Yellow Gold $168.5 21 bids 1 day 5 hours 27 minutes
Diamond Wedding Engagement .50 TCW Ring with Wrap Size 6 $104.25 3 bids 1 day 6 hours 15 minutes
IGI Certified Lab Created Diamond 1.13 Carat Engagement Ring 14k White Gd Sz 5.5 $750.0 1 bid 1 day 6 hours 19 minutes
TWO DIAMOND RINGS (Engagement & Wedding Band) - size 6 $3000.0 1 bid 1 day 6 hours 26 minutes
14K Gold 3 Stone Natural Diamond Engagement Ring 1/2 Ct 3.61 Grams Signed $112.5 12 bids 1 day 8 hours 12 minutes
VINTAGE TIFFANY & CO DIAMOND SOLITAIRE ENGAGEMENT WEDDING RING SET PLATINUM $285.0 38 bids 1 day 8 hours 19 minutes
14K Gold Natural Diamond Princess Cut Engagement Ring 1/2 Ct $230.0 20 bids 1 day 8 hours 24 minutes
VINTAGE ILLUSION SET DIAMOND WEDDING ENGAGEMENT RING 14K WHITE GOLD ~.80CTTW $155.5 21 bids 1 day 8 hours 30 minutes
14K Gold Natural Diamond Past Present Future Engagement Ring 0.40 TCW $122.5 14 bids 1 day 8 hours 32 minutes
Natural Padparadscha Sapphire Diamond Ring Art Deco Edwardian Filigree Engage $5100.0 1 bid 1 day 8 hours 45 minutes
rings for women gold 14k size 7 $5000.0 1 bid 1 day 9 hours 4 minutes
Gabriel & Co Ladies 14K White Gold Engagement 1.23 CTTW Diamond Ring Set 7.3 G $511.0 42 bids 1 day 10 hours 43 minutes
Estate 1.00CT. Diamond Cross Over Wedding Band Ring in 10K White Gold 2.7g $277.0 39 bids 1 day 11 hours 5 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
Certified 0.58 Carat E SI1 Princess Enhanced Natural Loose Diamond 3.98x3.86mm $156.5 9 bids 1 hour 14 minutes
Certified 0.55 Carat H SI2 Round Brilliant Enhanced Natural Loose Diamond 5.3mm $142.5 7 bids 1 hour 38 minutes
0.94CTS 6MM VVS2 ROUND UNTREAT J COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $116.5 14 bids 1 hour 55 minutes
2.31CTS 9MM VS2 OVAL H COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $182.5 11 bids 2 hours 15 minutes
2.38CTS 8MM VS1 EMERALD FANCY GREEN BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $170.5 9 bids 2 hours 45 minutes
Cert 0.87 Carat Fancy Yellow SI2 Round Brilliant Enhanced Natural Diamond 5.85mm $126.52 15 bids 5 hours 8 minutes
Certified 0.21 Carat D Color VS1 Round Brilliant Natural Loose Diamond 3.93m 3VG $237.31 2 bids 5 hours 14 minutes
2.61 CT Round G VS1 IGI Certified Lab Grown Diamond $485.0 17 bids 5 hours 55 minutes
Certified 0.68 Carat E Color SI2 Round Brilliant Natural Loose Diamond 5.47mm $197.5 13 bids 6 hours 14 minutes
Certified 0.83 Carat H SI2 Round Brilliant Enhanced Natural Diamond 5.71mm 3VG $183.5 16 bids 7 hours 38 minutes
Cert 1.04 Carat Yellow Brown VS1 Round Brilliant Enhanced Natural Diamond 6.14mm $280.0 36 bids 7 hours 50 minutes
Loose natural Diamond Princess 1.04 ct (2 diamonds) VVS1 Blue color $223.5 10 bids 9 hours 19 minutes
Loose natural Diamond Cushion 1.03 Ct VVS1 H Color $281.0 18 bids 9 hours 25 minutes
Loose natural Diamond Round 1.08 Ct VS1 F color $405.0 17 bids 9 hours 29 minutes
Certified 0.57 Carat D VS2 Round Brilliant Enhanced Natural Loose Diamond 5.02mm $305.0 20 bids 9 hours 44 minutes
0.40 cts CERTIFIED Round SI2 Vivid Apple Green Color Loose Natural Diamond 27368 $119.5 4 bids 10 hours 23 minutes
0.70 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 27363 $150.5 4 bids 10 hours 33 minutes
0.75 cts. CERTIFIED Round Brilliant Off White Color Loose Natural Diamond 27359 $143.5 5 bids 10 hours 43 minutes
1.04CTS 6MM VS2 CUSHION UNTREAT H COLOR WHITE LAB CERTIFY LOOSE NATURAL DIAMOND $127.5 11 bids 10 hours 55 minutes
0.61 cts. CERTIFIED Round SI3 Light Greenish Brown Loose Natural Diamond 27079 $116.0 4 bids 11 hours 3 minutes
1.00CTS 6MM VS1 HEART INTENSE FANCY RED LAB CERTIFIED LOOSE NATURAL DIAMOND $169.5 38 bids 11 hours 5 minutes
1.21 cts. CERTIFIED Round Cut I2 Deep Brownish Green Loose Natural Diamond 27265 $168.0 4 bids 11 hours 13 minutes
3.35CTS 8MM VS1 EMERALD FANCY LIGHT GREEN LAB CERTIFIED LOOSE NATURAL DIAMOND $187.5 12 bids 11 hours 15 minutes
2.49CTS 8MM VS2 ROUND UNTREAT I COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $207.5 14 bids 11 hours 25 minutes
1.61CTS 7MM VVS2 EMERALD UNTREAT F COLOR WHITE LAB CERTIFY LOOSE NATURAL DIAMOND $157.5 9 bids 11 hours 35 minutes
1.88CTS 6MM VVS+ ROUND FANCY BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $155.5 24 bids 11 hours 45 minutes
0.72 cts. CERTIFIED Round I2 Salt And Pepper Color Loose Natural Diamond 27358 $136.0 4 bids 12 hours 3 minutes
0.68 cts. CERTIFIED Round Vivid Peridot Green Color Loose Natural Diamond 24028 $150.5 3 bids 12 hours 13 minutes
0.52 cts. CERTIFIED Round SI2 Light Greenish Yellow Loose Natural Diamond 27328 $167.0 4 bids 12 hours 43 minutes
0.55 cts CERTIFIED Round Brilliant Cut White-J Color Loose Natural Diamond 27357 $105.0 4 bids 13 hours 23 minutes
1.36CTS 7MM VS1 ROUND FANCY BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $158.5 14 bids 13 hours 25 minutes
2.77CTS 9MM VVS1 HEART F COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $182.5 28 bids 13 hours 30 minutes
0.31 cts. CERTIFIED Round SI2 Vivid Royal Blue Color Loose Natural Diamond 24171 $108.0 4 bids 13 hours 33 minutes
1.09CTS 6MM VS1 ASSCHER UNTREAT E COLOR WHITE LAB CERTIFY LOOSE NATURAL DIAMOND $127.5 5 bids 13 hours 35 minutes
2.37CTS 8MM VS2 RECTANGLLAR DEEP BLUISH GREEN LAB CERTIFY LOOSE NATURAL DIAMOND $123.5 6 bids 13 hours 40 minutes
0.93CTS 6MM IF RADIANT UNTREAT J COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $117.5 21 bids 14 hours
1.22CTS 6MM VVS2 ROUND UNTREAT H COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $137.5 5 bids 14 hours 10 minutes
0.77 cts. CERTIFIED Round Brilliant Off White Color Loose Natural Diamond 27361 $137.5 5 bids 14 hours 13 minutes
2.12CTS 8MM VVS1 ROUND D COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $378.0 27 bids 14 hours 20 minutes
0.78 cts. CERTIFIED Round Brilliant Off White Color Loose Natural Diamond 27365 $138.5 5 bids 14 hours 23 minutes
1.37 cts Blue Green Diamond Natural Diamond 100% Natural Loose Color Diamond $299.99 1 bid 14 hours 27 minutes
0.42 cts CERTIFIED Round Cut SI1 Vivid Peridot Green Loose Natural Diamond 27378 $105.0 3 bids 14 hours 33 minutes
1.73CTS 7MM VS2 ROUND UNTREAT CHAMPAGNE YELLOW LAB CERTIFY LOOSE NATURAL DIAMOND $102.5 3 bids 15 hours 45 minutes
1.09CTS 6MM IF EMERALD UNTREAT G COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $127.5 5 bids 16 hours 35 minutes
1.61CTS 7MM VVS2 ROUND UNTREAT F COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $102.5 10 bids 17 hours 5 minutes
1.17CT 6MM VS1 ROUND UNTREAT CHAMPAGNE COLOR LAB CERTIFIED LOOSE NATURAL DIAMOND $103.5 3 bids 17 hours 25 minutes
Natural White Diamond 2.00 Ct Loose Certified Faceted VVS1 Round Cut 8.2 mm CA29 $102.5 14 bids 20 hours 52 minutes
1.29CTS 6MM VVS2 RADIANT INTENSE BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $132.5 6 bids 1 day 2 hours 15 minutes
2.83CTS 7MM VS1 PRINCESS FANCY BROWN LAB CERTIFIED LOOSE NATURAL DIAMOND $102.5 20 bids 1 day 2 hours 25 minutes
1.04CTS 6MM VS2 CUSHION UNTREAT D COLOR WHITE LAB CERTIFY LOOSE NATURAL DIAMOND $132.5 4 bids 1 day 2 hours 45 minutes