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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
1.55Ct Natural Zambian Green Emerald & IGI Certified Diamond Ring In 14KT Gold $255.0 14 bids 1 hour 8 minutes
Real 14KT White Gold / 2.00Ct Round Shape Solitaire With Accents Engagement Ring $105.5 9 bids 1 hour 40 minutes
14KT White Gold & D-Color 2.00Ct Round Shape Solitaire With Accents Women's Ring $390.0 28 bids 1 hour 52 minutes
Gorgeous Off White Diamond Solitaire Ring In Yellow Finish, 3.45 Ct Certified $161.48 28 bids 9 hours 7 minutes
1ctw Princess Baguette Round Diamond 14k White Gold Engagement Ring $286.0 27 bids 10 hours
14k white gold diamond halo ring $187.5 14 bids 10 hours 51 minutes
Diamond Nexus Round Cut Solitaire Ring $175.0 1 bid 11 hours 23 minutes
ladies 14k white gold round diamond & oval sapphire halo engagement ring $395.0 1 bid 11 hours 59 minutes
1/2cttw 12 diamond band HI I1 Platinum/Palladium.950 size 7.25 TIMELESS CLASSIC $165.5 20 bids 12 hours 36 minutes
Estate Antique Art Decor 18K White Gold 40 CTW Diamond Engagement Ring Size 7 $122.5 36 bids 12 hours 51 minutes
Women's Solid White Gold Vintage Pearl Ring sz6.5, not scrap, Valentine's Day $130.0 1 bid 15 hours 4 minutes
1.5 cttw diamond engagement ring set HISI3 14k.gold size7 1/2ct Princess center $325.0 21 bids 17 hours 43 minutes
$5,000 1.06CT PRINCESS CUT BLUE & WHITE DIAMOND ENGAGEMENT RING 14K WHITE GOLD $911.5 38 bids 18 hours 19 minutes
$1,250 .50CT NATURAL ROUND CUT WHITE DIAMOND ENGAGEMENT RING 10K YELLOW GOLD $177.5 21 bids 18 hours 23 minutes
$3,000 .70CT NATURAL ROUND CUT WHITE DIAMOND ENGAGEMENT RING 18K WHITE GOLD $395.0 20 bids 18 hours 31 minutes
PREOWNED DIAMOND SOLITARE APPROX 1/2 CT ***14K SOLID GOLD*** NO RESERVE*** $399.0 1 bid 18 hours 37 minutes
$2,000 .44CT NATURAL SOLITAIRE ROUND CUT WHITE DIAMOND PLATINUM ENGAGEMENT RING $308.0 18 bids 18 hours 43 minutes
Emerald Ring Gold Diamond Real Colombian 5.43CTW GIA Certified RETAIL $23400 $810.0 25 bids 18 hours 45 minutes
$3,000 .63CT NATURAL FANCY DEEP ORANGE DIAMOND ENGAGEMENT RING 14K WHITE GOLD $317.0 21 bids 18 hours 47 minutes
14k White Gold real Diamond. wedding ring $325.0 1 bid 18 hours 48 minutes
14K SOLID WHITE GOLD 69 NATURAL DIAMOND RING / BAND BY NILI $107.5 26 bids 19 hours 9 minutes
Estate 14K Yellow Gold 0.12 Ct Brilliant Cut Diamond Emerald Ring 0.22 Cts Total $140.5 18 bids 19 hours 12 minutes
14K WHITE GOLD WHITE & CHOCOLATE DIAMOND HALO RING SIZE 8 SIZEABLE SPARKLE !! $255.0 1 bid 19 hours 17 minutes
Estate 14K Yellow, White Gold WEIGHED 0.46 Ct Oval Cut Diamond Ring 0.94 Cts TW $257.0 28 bids 19 hours 22 minutes
Marquise Natural Diamond Solitaire Engagement Ring 14k GOLD Sz 5.5 & Guard Scrap $299.99 1 bid 19 hours 29 minutes
14K SOLID YELLOW GOLD SOLITAIRE VIBRANT COGNAC NATURAL DIAMOND RING- ACCENTS $161.5 19 bids 19 hours 37 minutes
Estate 14K Yellow Gold 0.37 Ct White Marquise Cut Diamond Ring 0.50 Cts Total $102.5 23 bids 19 hours 43 minutes
KSR Estate 14K White Gold 0.42 Ct Brilliant Cut Diamond Halo Ring 0.50 Cts Total $204.5 18 bids 19 hours 48 minutes
Estate 14K Yellow Gold WEIGHED 0.50 Ct Brilliant Cut Diamond Ring 1.00 Ct Total $305.0 29 bids 19 hours 58 minutes
Diamond 1/2CT Total Weight Three Stone Twist Engagement Ring 10K White Gold $171.5 2 bids 20 hours 11 minutes
2/3ct (.70) Natural Solitaire Diamond Engagement Ring $300.0 3 bids 20 hours 16 minutes
1940s Vintage 14K White Gold 0.20 Ct Brilliant Cut Diamond Ring 0.40 Ct Total $170.5 32 bids 20 hours 17 minutes
Vintage DAVID YURMAN STERLING & 18k RING Size 6.75 750 Gold .925 Real Diamonds $139.99 1 bid 21 hours 13 minutes
HUGE 25.70 Stunning Off White Solitaire Solitaire Ring.Certified RARE COLLECTION $303.0 18 bids 21 hours 18 minutes
Certified Emerald Cut Off White Diamond Solitaire Ring- 4.80 Ct ! Full of Fire ! $153.5 41 bids 21 hours 24 minutes
RARE uNISEX Certified 24.60 Ct Champagne Diamond Solitaire Ring WATCH VIDEO $170.5 45 bids 21 hours 34 minutes
6.90 Ct IGI Certified 100% Natural Tanzanite Diamond Ring 14KT Solid White Gold $405.0 22 bids 21 hours 34 minutes
KAY 14k white gold NATURAL diamond princess cut ring .50CTW; size 8 $345.0 1 bid 22 hours 40 minutes
2.05 Ct Round Cut VS2/D Solitaire Diamond Engagement Ring 14K White Gold $2832.0 1 bid 1 day 11 hours 43 minutes
Pear Natural Ruby Center 14k Ring White Gold Diamond Deco Inspired Engagement $167.5 2 bids 1 day 12 hours 26 minutes
10K RETRO UNIQUE STYLED REAL DIAMOND RING ROUND AND BAUGETTES 3.8 Gr NOT SCRAP $107.5 26 bids 1 day 14 hours 55 minutes
0.52ct Genuine Natural Diamond Solitaire Engagement Ring In 14K Yellow Gold, VS2 $207.5 14 bids 1 day 17 hours 18 minutes
14K TWO TONE SOLID GOLD RING / BAND W / 10 ROUND BRILLIANT CUT NATURAL DIAMONDS $139.5 19 bids 1 day 18 hours 12 minutes
VINTAGE 14K SOLID WHITE GOLD RING / BAND / .80 CTS T.W. NATURAL DIAMONDS $302.0 30 bids 1 day 18 hours 37 minutes
10k White Gold .417 Diamond-.50 tcw Band Fine Engagement Ring-Size 6.75 $179.0 1 bid 1 day 18 hours 40 minutes
*SETTING ONLY* 1.5 CARAT PLATINUM DIAMOND ENGAGEMENT RING MOUNTING FOR 1 CT OVAL $455.0 9 bids 1 day 19 hours 42 minutes
ANTIQUE EDWARDIAN .30 CT EUROPEAN CUT DIAMOND SOLITAIRE 14K GOLD ENGAGEMENT RING $152.5 11 bids 1 day 20 hours 12 minutes
14k White Gold Pear Diamond 1 carat Solitaire Engagement Ring Size 7 NR RG3088 $459.0 3 bids 1 day 20 hours 15 minutes
RARE 8.25 Ct Off White Diamond Solitaire Ring in Two Tone Finish WATCH VIDEO $224.5 34 bids 1 day 21 hours 13 minutes
RARE 29.75 Ct Unisex Blue Diamond Solitaire Ring in Prong Setting WATCH VIDEO $202.5 35 bids 1 day 21 hours 16 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
Certified 1.08 Carat K SI1 Round Brilliant Enhanced Natural Loose Diamond 6.28mm $415.0 14 bids 14 hours 24 minutes
Cert 1.35 Carat Fancy Silver SI3 Round Brilliant Enhanced Natural Diamond 6.81mm $157.5 14 bids 14 hours 44 minutes
Certified 1.12 Carat F SI2 Oval Enhanced Natural Loose Diamond 8.01x5.7mm 2VG $313.0 7 bids 16 hours 3 minutes
Cert 0.71 Ct Top Light Brown SI1 Round Brilliant Enhanced Natural Diamond 5.5mm $185.0 1 bid 16 hours 4 minutes
Certified 0.91 Carat F Color Round Brilliant Enhanced Natural Diamond 6.15mm $187.5 10 bids 16 hours 34 minutes
Loose natural Cushion Diamond 1.06 Ct VVS1 F Color $355.0 11 bids 16 hours 45 minutes
Loose natural Diamond Princess 1.04 ct VVS1 Vivid yellow color $109.5 17 bids 16 hours 47 minutes
1.13CTS 6MM VVS2 PRINCESS UNTREAT F COLOR WHITE CERTIFIED LOOSE NATURAL DIAMOND $299.0 1 bid 17 hours 32 minutes
0.51 cts. CERTIFIED Round Cut Vivid Royal Blue Color Loose Natural Diamond 25397 $103.0 7 bids 18 hours 12 minutes
3.04 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 21546 $128.6 6 bids 18 hours 16 minutes
0.38 cts. CERTIFIED Round SI1 Sparkly Golden Brown Loose Natural Diamond 21626 $135.9 8 bids 18 hours 20 minutes
2.96 cts. CERTIFIED Round Cut Brownish Black Color Loose Natural Diamond 21384 $146.9 6 bids 18 hours 24 minutes
2.80 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 24578 $141.0 6 bids 18 hours 30 minutes
0.36 cts. CERTIFIED Round Brilliant Cut SI2 White-H Loose Natural Diamond 25469 $129.5 7 bids 18 hours 32 minutes
0.40 cts. CERTIFIED Round SI1 Vivid Intense Yellow Loose Natural Diamond 24844 $129.5 6 bids 18 hours 34 minutes
0.63 cts. CERTIFIED Round Cut Sparkly Brown Color Loose Natural Diamond 21680 $114.0 6 bids 18 hours 36 minutes
0.51 cts. CERTIFIED Round Brilliant Light Gray Color Loose Natural Diamond 25091 $113.1 7 bids 18 hours 38 minutes
0.30 cts. CERTIFIED Round Brilliant Cut SI1 White-I Loose Natural Diamond 24461 $116.0 7 bids 18 hours 40 minutes
0.66 cts. CERTIFIED Round Cut Vivid Royal Blue Color Loose Natural Diamond 25427 $124.9 8 bids 18 hours 42 minutes
0.51 cts CERTIFIED Round Brilliant Cut White-H Color Loose Natural Diamond 25072 $113.1 6 bids 18 hours 48 minutes
0.32 cts. CERTIFIED Round Brilliant Cut SI1 White-J Loose Natural Diamond 24420 $117.5 5 bids 18 hours 50 minutes
0.30 cts. CERTIFIED Round Brilliant Cut SI1 White-J Loose Natural Diamond 25466 $109.4 7 bids 18 hours 53 minutes
0.40 ct CERTIFIED Round SI1 Fiery Golden Brown Color Loose Natural Diamond 21757 $184.8 8 bids 18 hours 56 minutes
0.60 cts. CERTIFIED Round Cut I1 Light Gray Color Loose Natural Diamond 25050 $150.5 7 bids 18 hours 58 minutes
0.56 cts. CERTIFIED Round SI1 Light Grayish Yellow Loose Natural Diamond 21759 $192.0 6 bids 19 hours
0.44 cts CERTIFIED Round Cut SI2 Vivid Canary Yellow Loose Natural Diamond 24847 $136.0 5 bids 19 hours 5 minutes
0.64 cts. CERTIFIED Round VS2 Grayish Yellow Color Loose Natural Diamond 21760 $214.7 6 bids 19 hours 6 minutes
0.57 cts. CERTIFIED Round Brilliant I1 White-I Color Loose Natural Diamond 23091 $188.4 6 bids 19 hours 8 minutes
0.82 cts. CERTIFIED Round SI3 Light Grayish Yellow Loose Natural Diamond 21772 $207.5 5 bids 19 hours 10 minutes
0.45 cts. CERTIFIED Round Brilliant Cut I1 Off White Loose Natural Diamond 24692 $100.5 6 bids 19 hours 14 minutes
2.51 cts. CERTIFIED Round Brilliant Cut Gray Color Loose Natural Diamond 23721 $114.0 6 bids 19 hours 16 minutes
1.79 cts. CERTIFIED Round Cut Brownish Black Color Loose Natural Diamond 23212 $111.2 6 bids 19 hours 19 minutes
0.64 cts. CERTIFIED Round Brilliant Cut I1 White-I Loose Natural Diamond 24044 $173.5 5 bids 19 hours 20 minutes
0.61 cts CERTIFIED Round Cut SI3 Grayish Brown Color Loose Natural Diamond 21780 $111.2 6 bids 19 hours 20 minutes
1.51 cts. CERTIFIED Pear Brilliant Cut Golden Brown Loose Natural Diamond 25313 $236.5 6 bids 19 hours 22 minutes
0.87 cts. CERTIFIED Round Cut I1 Grayish Brown Color Loose Natural Diamond 21793 $131.3 6 bids 19 hours 26 minutes
1.05 cts. CERTIFIED Round Brilliant Light Gray Color Loose Natural Diamond 24104 $132.5 6 bids 19 hours 30 minutes
1.53 cts. CERTIFIED Round Cut Brownish Gray Color Loose Natural Diamond 21799 $340.7 6 bids 19 hours 30 minutes
0.88 cts. CERTIFIED Round I1 Vivid Royal Blue Color Loose Natural Diamond 25354 $232.8 7 bids 19 hours 32 minutes
0.53 cts. CERTIFIED Round Brilliant Cut I1 White-J Loose Natural Diamond 23910 $147.8 11 bids 19 hours 36 minutes
1.13 cts. CERTIFIED Round Brilliant White -J Color Loose Natural Diamond 21807 $413.3 14 bids 19 hours 36 minutes
0.59 cts. CERTIFIED Round Brilliant Off White Color Loose Natural Diamond 25021 $139.5 6 bids 19 hours 38 minutes
0.99 cts. CERTIFIED Round Brilliant White -J Color Loose Natural Diamond 21810 $366.8 19 bids 19 hours 40 minutes
0.98 cts. CERTIFIED Round Cut SI2 Faint Yellow Color Loose Natural Diamond 21818 $359.6 5 bids 19 hours 46 minutes
0.45 cts. CERTIFIED Round Brilliant Cut I1 White-G Loose Natural Diamond 23840 $113.1 6 bids 19 hours 46 minutes
0.50 cts. CERTIFIED Round SI1 Fancy Gray Brown Color Loose Natural Diamond 23148 $114.9 6 bids 19 hours 48 minutes
6.39 cts. CERTIFIED Round Brilliant Cut Brown Black Loose Natural Diamond 14353 $400.0 7 bids 19 hours 49 minutes
1.11 cts CERTIFIED Round Cut SI1 Grayish Brown Color Loose Natural Diamond 21821 $468.8 6 bids 19 hours 50 minutes
1.73 cts CERTIFIED Round Cut SI1 Brownish Gray Color Loose Natural Diamond 21833 $598.8 14 bids 19 hours 56 minutes
1.70 cts CERTIFIED Round Cut SI3 Grayish Brown Color Loose Natural Diamond 21836 $477.6 6 bids 20 hours