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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
1.50 karet Princess Cut Diamond Engagement Ring With Wedding Band 14k white Gold $600.0 1 bid
19 minutes Vintage Art Deco Cluster Cocktail Engagement Ring 2.21 CT Diamond 14K White Gold $180.69 1 bid 1 hour 16 minutes
Days Jewelers- 14k Pink Gold Genuine Diamond Ring With Transferable Insurance $195.0 1 bid 1 hour 50 minutes
5.65 Ct Certified Emerald Cut Greenish Blue Diamond Solitaire Ring in Prongs $123.0 16 bids 10 hours 53 minutes
Ornate Vintage 14ct Gold & Large Smokey Quartz Ladies Ring c1967 14.28 grams $111.0 10 bids 12 hours 39 minutes
Beautiful 18ct Gold & 0.50cts Of Diamonds Ladies Ring Circa 2014 $112.0 19 bids 13 hours 4 minutes
Beautiful Vintage 14ct Gold Emerald & Diamond Ladies Ring Circa 1986 $75.0 12 bids 13 hours 14 minutes
Beautiful Ornate Vintage 18ct Gold & Large Citrine Ladies Ring c1975 8.08 Grams $134.0 33 bids 13 hours 24 minutes
Beautiful 18ct Gold & 0.50ct Of Diamonds Ladies Trilogy Ring Circa 2019 $114.0 15 bids 14 hours 4 minutes
Vintage 9ct Yellow Gold, Solitaire 1.00ct Diamond Ring $165.0 13 bids 14 hours 16 minutes
Antique Victorian Platinum Diamond Engagement Ring Natural 1.0 TCW Size 5.75 $267.0 25 bids 14 hours 34 minutes
Ladies 18ct Gold Diamond Solitaire Engagement Ring 0.25 Carat Size M $150.0 1 bid 15 hours 15 minutes
Solid 18ct Yellow & White Gold, Solitaire 1.03ct Diamond Ring $510.0 20 bids 15 hours 22 minutes
Beautiful 18ct Gold Sapphire & Diamond Victorian Style Gypsy Ring London 1979 $134.0 33 bids 15 hours 24 minutes
Mid 20th Century Solid Platinum, Solitaire 0.83ct Diamond Ring Not 18ct Gold $460.0 15 bids 15 hours 42 minutes
Beautiful 18ct Gold & 0.75cts Of Diamonds Ladies Trilogy Ring Circa 2002 $143.0 16 bids 15 hours 44 minutes
4.52 Carat Natural Emerald and Diamond 14K White Gold Engagement Ring $330.0 30 bids 16 hours 14 minutes
diamond engagement ring size 6 white gold $102.5 27 bids 16 hours 21 minutes
0.54ct RBC Center Diamond Solid 14k White Gold Baguette Accents Engagement Ring $260.0 26 bids 17 hours 5 minutes
Fits 6-6.5mm 18k gold diamond ring semi mount 1ctw size 6.75 $325.0 1 bid 17 hours 12 minutes
5.50 Carat Natural Tanzanite 14K White Gold Diamond Ring $305.0 10 bids 17 hours 23 minutes
10K WHITE GOLD SEMI MOUNT WITH 30 ROUND NATURAL SIDE DIAMONDS CENTER 6.5 MM $101.0 27 bids 19 hours 23 minutes
18K 1940s SOLID WHITE GOLD ENGAGEMENT RING W / .45 ROUND VS NATURAL DIAMOND $207.5 30 bids 19 hours 43 minutes
VERA WANG LOVE 14K WHITE GOLD SI2 Diamond & Sapphire Engagement & Wedding Ring $810.0 54 bids 19 hours 50 minutes
💎 Vintage 18k Solid Yellow Gold Diamond Engagement Solitaire 6 Prong Sz 6.25 $251.0 2 bids 20 hours 28 minutes
Statement Engagement Ring 925 Silver Natural Emerald Diamond Victorian Jewelry $139.5 1 bid 20 hours 36 minutes
14kt white gold diamond ring $177.5 14 bids 20 hours 43 minutes
Vintage .86ct Natural Unheated Alexandrite Diamond 14k Gold Ring Trillion Estate $490.0 78 bids 20 hours 58 minutes
ESTATE~3.40 CT. EMERALD & DIAMOND HALO 14K WHITE GOLD ENGAGEMENT COCKTAIL RING $715.0 26 bids 21 hours 13 minutes
Vera Wang 'Love' Appx. 0.40 CT Oval Center 14K Gold Wedding Set (Box) $600.0 1 bid 21 hours 17 minutes
STUNNING Solid 14k White Gold / 2 CT TWT Diamonds Ladies Deco Ring Size 7 ~ 7.2g $219.5 13 bids 22 hours 23 minutes
14KT Gold / 2.00Ct Natural Yellowish Green Diamond Solitaire With Accents Ring $152.5 9 bids 1 day 1 hour 28 minutes
14k White Gold Natural Diamond Engagement | Anniversary Ring Size 7.5 (2.4g) $188.0 1 bid 1 day 5 hours 55 minutes
14k Solid Yellow Gold Ring Double Band Natural Diamond And Rubies Pre-owned $153.53 12 bids 1 day 11 hours 26 minutes
Tiffany & Co Platinum 1.82ct Diamond Solitaire Engagement Ring I VS1+Certificate $13700.0 8 bids 1 day 12 hours 45 minutes
EFFY 14k White Gold Sapphire & Diamond Band Fine Halo Style Ring Size 8 $224.5 8 bids 1 day 12 hours 55 minutes
Beautiful 18K 18ct Yellow Gold & 0.50ct Diamond 5 Stone Engagement Ring UK M $200.0 2 bids 1 day 14 hours 20 minutes
Beautiful Chunky 9ct Gold Ruby Emerald Sapphire & Diamond Engagement Ring UK W $95.0 1 bid 1 day 14 hours 34 minutes
Le Vian rare CUSTOM MADE 14k rose gold diamond engagement ring $500.0 1 bid 1 day 16 hours 25 minutes
diamond ring size 4.5 $2500.0 1 bid 1 day 19 hours 8 minutes
14k white gold .18ct I1 H round diamond solitaire engagement ring 1.5g size 6.25 $149.99 1 bid 1 day 19 hours 10 minutes
$6,000 1.16CT NATURAL MARQUISE CUT DIAMOND PLATINUM ENGAGEMENT RING $401.99 34 bids 1 day 19 hours 25 minutes
$6,000 1.55CT NATURAL ROUND CUT WHITE DIAMOND ENGAGEMENT RING 14K WHITE GOLD $415.0 27 bids 1 day 19 hours 33 minutes
14k 18k white gold .98ct VS G diamond engagement ring 2 wedding bands 12.7g $899.98 1 bid 1 day 20 hours 29 minutes
Estate 14K Yellow Gold 0.23 Ct White Marquise Cut Diamond Ring 0.75 Cts Total $180.5 32 bids 1 day 20 hours 33 minutes
14k yellow gold .18ct diamond engagement semi mount ring 5.5g ladies size 5 $299.99 1 bid 1 day 20 hours 36 minutes
14k yellow gold .75ct I1 L marquise diamond engagement ring 5.1g laser drilled $549.98 1 bid 1 day 20 hours 51 minutes
1940s Vintage 14K White Gold 0.20 Ct Brilliant Cut Diamond Ring 0.44 Cts Total $202.5 33 bids 1 day 21 hours 9 minutes
1.27ct Genuine Natural Diamond Solitaire Engagement Ring In 14K Yellow Gold, $635.08 29 bids 1 day 21 hours 12 minutes
1.04Ct Genuine Natural Fancy Color Diamond Engagement Ring In 14K White Gold, SI $305.0 28 bids 1 day 21 hours 36 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
2.88 cts. CERTIFIED Round Brilliant Brown Gray Color Loose Natural Diamond 22562 $139.0 11 bids
8 minutes 0.92CTS 6MM VS1 CUSHION UNTREAT G COLOR WHITE LAB CERTIFID LOOSE NATURAL DIAMOND $209.0 1 bid
23 minutes 0.23Ct VS Brilliant Round Cut 3.60 mm Genuine Untreated - Argyle Pink Diamond $110.99 1 bid 1 hour 12 minutes
0.42Ct "GIL" CERTIFIED UNTREATED NATURAL FANCY PURPLE PINK DIAMOND FROM ARGYLE $480.0 6 bids 7 hours 2 minutes
Cert 0.71 Carat F Round Brilliant Enhanced Natural Loose Diamond 5.89mm 3VG $102.5 13 bids 13 hours 14 minutes
mixed diamonds D-I VS-IF 2.02ct natural loose diamonds $311.0 19 bids 14 hours 36 minutes
Emerald Cut Diamond E VVS2 0.25ct natural loose diamonds $116.0 19 bids 14 hours 39 minutes
Round Brilliant Cut Diamond I SI2 0.44ct natural loose diamonds $76.0 13 bids 14 hours 40 minutes
Round Brilliant Cut Diamond G SI1 0.23ct natural loose diamonds $77.0 11 bids 14 hours 42 minutes
Round Brilliant Diamond M VVS1 0.43ct natural loose diamonds $102.0 30 bids 14 hours 46 minutes
Round Brilliant Cut Diamond G SI2 0.26ct natural loose diamonds $103.01 11 bids 14 hours 53 minutes
Old Mine Cut Diamond N SI2 0.44ct natural loose diamonds $101.99 18 bids 14 hours 58 minutes
mixed Round Brilliant Cut Diamonds 12.84ct natural loose diamonds $1070.0 14 bids 15 hours 2 minutes
Loose natural Cushion Diamond 1.03 VVS1 F Color $213.5 19 bids 15 hours 26 minutes
Loose natural Diamond Round 0.71 Ct Flawless Fancy Light Pink $127.5 15 bids 15 hours 48 minutes
Loose natural Diamond Round 0.54 Ct VVS1 Fancy Light Pink $101.0 20 bids 15 hours 50 minutes
Loose natural Diamond Oval 1.02 Ct VVS1 F Color $293.0 39 bids 15 hours 52 minutes
Certified Natural Loose Diamond 0.47 Ct I VVS2 Princess Cut IGL Certificate $227.0 6 bids 19 hours 14 minutes
0.88 cts CERTIFIED Round Brilliant Cut White-I Color Loose Natural Diamond 25089 $209.0 7 bids 19 hours 16 minutes
3.75 cts. CERTIFIED Round Brilliant Cut Black Brown Loose Natural Diamond 22555 $220.1 6 bids 19 hours 18 minutes
0.54 cts. CERTIFIED Pear Cut SI2 Intense Brown Color Loose Natural Diamond 21285 $146.7 9 bids 19 hours 22 minutes
3.18 cts. CERTIFIED Round Cut Grayish Brown Color Loose Natural Diamond 21992 $162.3 6 bids 19 hours 28 minutes
13.04 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 24579 $825.5 7 bids 19 hours 32 minutes
4.23 cts. CERTIFIED Round Brilliant I3 Black Color Loose Natural Diamond 18594 $174.7 6 bids 19 hours 54 minutes
1.06 cts. CERTIFIED Round Cut I1 Sparkly Light Brown Loose Natural Diamond 21812 $393.0 6 bids 19 hours 58 minutes
0.45 cts. CERTIFIED Round Cut SI2 Vivid Peacock Blue Loose Natural Diamond 22886 $119.1 7 bids 20 hours 4 minutes
0.35 cts CERTIFIED Round Cut SI1 Sparkly Fancy Brown Loose Natural Diamond 16916 $145.9 6 bids 20 hours 8 minutes
0.74 cts CERTIFIED Round Cut I1 Intense Golden Brown Loose Natural Diamond 23106 $172.6 10 bids 20 hours 10 minutes
2.33 cts. CERTIFIED Round Brilliant Cut Black Color Loose Natural Diamond 24009 $220.0 7 bids 20 hours 12 minutes
0.29 cts CERTIFIED Round Cut SI1 Vivid Canary Yellow Loose Natural Diamond 21316 $110.5 6 bids 20 hours 16 minutes
Round Fancy Yellow Diamond | Natural 0.39 cts Fancy Color Diamond | Unheated $183.74 1 bid 20 hours 16 minutes
3.44 cts. CERTIFIED Round Cut I3 Grayish Brown Color Loose Natural Diamond 19738 $150.2 6 bids 20 hours 18 minutes
2.80 cts. CERTIFIED Round Brilliant Dark Gray Color Loose Natural Diamond 22585 $123.4 6 bids 20 hours 24 minutes
3.18 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 22638 $163.1 6 bids 20 hours 34 minutes
0.52 cts. CERTIFIED Round Brilliant I1 White-I Color Loose Natural Diamond 25041 $141.5 6 bids 20 hours 37 minutes
1.04 cts. CERTIFIED Round Brilliant Light Gray Color Loose Natural Diamond 21749 $209.9 6 bids 20 hours 38 minutes
2.79 cts. CERTIFIED Round Brilliant Dark Gray Color Loose Natural Diamond 22694 $150.5 8 bids 20 hours 44 minutes
0.50 cts. CERTIFIED Round I1 Vivid Sea Green Color Loose Natural Diamond 23124 $126.9 6 bids 20 hours 51 minutes
3.81 cts. CERTIFIED Round Brilliant Cut Brown Color Loose Natural Diamond 22612 $172.6 7 bids 20 hours 55 minutes
0.51 cts CERTIFIED Round Brilliant Cut White-H Color Loose Natural Diamond 25015 $153.6 6 bids 20 hours 57 minutes
0.87 cts. CERTIFIED Round SI1 Light Gray Brown Color Loose Natural Diamond 23150 $204.7 6 bids 21 hours 1 minute
2.49 cts CERTIFIED Round Cut I3 Blackish Brown Color Loose Natural Diamond 16011 $152.8 6 bids 21 hours 5 minutes
3.21 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 22663 $123.4 6 bids 21 hours 5 minutes
0.20 cts. CERTIFIED Round VS2 Intense Yellow Color Loose Natural Diamond 23442 $102.5 8 bids 21 hours 6 minutes
0.50 cts CERTIFIED Round Cut SI3 Sparkly Fancy Brown Loose Natural Diamond 16196 $106.1 6 bids 21 hours 14 minutes
0.45 cts CERTIFIED Round Brilliant Cut White-H Color Loose Natural Diamond 25006 $103.6 6 bids 21 hours 26 minutes
0.63 cts. CERTIFIED Round Cut Faint Gray Brown Color Loose Natural Diamond 23049 $175.6 6 bids 21 hours 31 minutes
3.55 cts. CERTIFIED Round Brilliant Dark Brown Color Loose Natural Diamond 22099 $148.5 6 bids 21 hours 33 minutes
0.71 cts. CERTIFIED Round Brilliant Cut Fancy White Loose Natural Diamond 25054 $203.9 6 bids 21 hours 36 minutes
0.70 cts. CERTIFIED Round Cut SI3 Vivid Peacock Blue Loose Natural Diamond 23128 $197.0 5 bids 21 hours 40 minutes