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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
4.10 Ct Treated Off White Diamond Solitaire Ring In 925 Silver.Certified. $100.0 22 bids 1 hour 3 minutes
Pre-Owned Women's Diamond Engagement/Wedding Ring - Size 9 $4000.0 1 bid 1 hour 12 minutes
14k yellow gold diamond engagement ring size 7 $660.0 12 bids 2 hours 27 minutes
1.75 Carat Natural Ruby 14K Solid Yellow Gold Luxury Engagement Ring $205.5 11 bids 2 hours 47 minutes
NATURAL AMETHYST 29X20 KYANITE SAPPHIRE DIAMOND CUT STERLING SILVER 925 RING $166.0 1 bid 2 hours 47 minutes
Simply Vera Vera Wang Two-tone Gold .75ctw Diamond Square Halo Ring, Size 7 $400.0 1 bid 2 hours 59 minutes
NATURAL STAR SAPPHIRE 17X13 OPAL SAPPHIRE DIAMOND CUT STERLING SILVER 925 RING $205.0 1 bid 3 hours 3 minutes
Vintage Aquamarine Diamond Band Engagement Ring 14K Rose Gold ~2.2 TCW Sz 6.75 $103.49 4 bids 3 hours 31 minutes
RARE 6 Ct Treated Off White Diamond Solitaire Ring With Accents-925 Silver VIDEO $130.5 13 bids 4 hours 32 minutes
natural Diamond Gold 14 K Ring Solitaire With 0.41 Ct Diamond SI1 E Color $166.69 14 bids 5 hours
Blue Diamond-Pear Shape. 10.8 Ct. 925 Silver Ring.Certified.Video. Great Luster! $120.5 28 bids 6 hours 14 minutes
Neil Lane 14K WG 0.85CT diamond engagement ring w/ 0.25CT center size 5.75 $293.0 24 bids 6 hours 46 minutes
BH EFFY 14K gold elegant .73CT diamond engagement ring w/ .41CT ctr. size 7 $324.0 25 bids 6 hours 49 minutes
Heavy 14K gold 1.51CTW diamond engagement ring w/ .91CT Marquise ctr. size 9 $521.0 12 bids 7 hours 2 minutes
$2,500 .74CT NATURAL COGNAC & WHITE DIAMOND ENGAGEMENT RING 14K WHITE GOLD $251.5 34 bids 7 hours 9 minutes
1.16Ct Genuine Natural Round Diamond Engagement Ring ,Solid 14K Yellow Gold, VS2 $385.0 34 bids 7 hours 15 minutes
Diamond Wedding Engagement Cocktail Ring 2Ct Diamonds 14Kt White Gold 5.2 Grams $265.0 34 bids 7 hours 16 minutes
Antique Platinum 0.46CT diamond engagement wedding ring size 7.5 $197.85 28 bids 7 hours 20 minutes
Beautiful 14K Yellow Gold and Diamond Size 7 Woman's Ring - 7.1 grams -Not Scrap $222.5 20 bids 7 hours 20 minutes
$3,000 .46CT NATURAL SOLITAIRE ROUND CUT WHITE DIAMOND PLATINUM ENGAGEMENT RING $227.61 20 bids 7 hours 21 minutes
Diamond Engagement Wedding Set 1/2Ct Diamonds 14Kt Yellow Gold 3.8 Grams $170.18 33 bids 7 hours 26 minutes
diamond engagement ring $510.0 3 bids 7 hours 32 minutes
SIM Estate 14K White Gold WEIGHED 0.64 Ct Brilliant Cut Diamond Solitaire Ring $152.5 29 bids 7 hours 46 minutes
14K white gold 0.50CT VS2/H diamond solitaire engagement wedding ring size 6 $357.09 28 bids 7 hours 46 minutes
MK Estate 18K Yellow Gold 0.50 Ct Round Brilliant Cut Diamond Ring 1.00 Ct Total $281.0 35 bids 8 hours 1 minute
Heavy 14K white gold 0.75CT diamond engagement wedding ring size 6.75 $169.5 25 bids 8 hours 2 minutes
Estate Diamond 14K Gold Marquise Cut Swirl Engagement Ring 6.4 Grams NR $232.0 19 bids 8 hours 34 minutes
Designer Diag 1.00ct Diamond 10K Gold Princess Cut Illusion Engagement Ring NR $224.5 14 bids 8 hours 52 minutes
Estate 0.70ct Diamond 14K Gold Round Cut Solitaire Engagement Ring NR $315.0 16 bids 9 hours 22 minutes
Heavy 18K WG 1.34CTW diamond cluster engagement ring semi-mounting size 6.75 $310.0 20 bids 9 hours 27 minutes
Simon G Platinum 2.62ct Diamond Engagement Ring w/ 1.67ct Center Size 4.25 $1884.0 36 bids 9 hours 32 minutes
AIG 0.83ct Natural Fancy Yellow Orange Diamond 18K Gold Pear Engagement Ring NR $191.5 24 bids 9 hours 32 minutes
Antique Platinum 0.83CT diamond filigree engagement ring w/ 0.71CT center size 6 $359.0 28 bids 9 hours 44 minutes
14K SOLID YELLOW GOLD RING W / RED NATURAL GARNETS & DIAMONDS SIZE 5 $127.5 21 bids 10 hours 2 minutes
IAS 1.66 Cts Light Yellow Diamond 18K Gold Cluster Engagement Ring NR $1150.0 34 bids 10 hours 12 minutes
GIA 1.36ct Natural Light Pink Diamond 18K Gold Radiant Cut Engagement Ring NR $1540.0 29 bids 10 hours 14 minutes
GIA 3.16ct Natural Fancy Light Yellow Diamond 18K Gold Engagement Ring NR $6863.0 65 bids 10 hours 18 minutes
Princess Cut Champagne Diamond Ring -Treated In 925 Silver, 8.50 Ct Certified. $100.99 37 bids 10 hours 19 minutes
Pre owned Diamond Engagement Ring - 14K White Gold Band - Small Fingers Size 4.5 $210.5 3 bids 10 hours 19 minutes
AA Natural Blue Tanzanite 1.90Ct & IGI Certified Diamond Ring In 14KT White Gold $102.5 12 bids 11 hours 56 minutes
Emerald Ring Diamond Gold 14K Natural Genuine 7.9CTW GIA Certified RETAIL$15,400 $1600.0 42 bids 22 hours 15 minutes
THE LEO First Light Diamond Solitaire Ring 1/2 ct Round 14K White Gold $315.0 28 bids 22 hours 29 minutes
Tiffany & Co. 925 Sterling Silver Diamond Wide Somerset Wide Mesh Band Ring $275.0 1 bid 23 hours 17 minutes
Certified RARE 16.80 Ct Blue Diamond Solitaire Ring In 925 Silver, Treated VIDEO $117.5 45 bids 23 hours 30 minutes
14k 0.70ct White Gold Halo Engagement Ring With Appraisal ($3500) $159.5 26 bids 23 hours 57 minutes
Excellent Antique 18ct Gold & 5-Stone Diamond Ring, Size Q.1/2 - Hallmarked 1917 $93.0 18 bids 1 day 2 hours 31 minutes
6.40 Carat Natural Emerald 14K Solid Yellow Gold Diamond Ring $730.0 25 bids 1 day 3 hours 37 minutes
4.58 Carat Natural Ruby 14K Solid White Gold Luxury Engagement Ring $400.0 15 bids 1 day 3 hours 47 minutes
0.58ct Genuine Natural Round Diamond Solitaire Engagement Ring, 14K Yellow Gold $188.5 17 bids 1 day 4 hours 8 minutes
2.11 Carat Natural Emerald and Diamond 14K White Gold Engagement Ring $151.0 20 bids 1 day 4 hours 16 minutes
Popular Loose Diamond Auctions on eBay Ending Soon
1.63CTS 8MM VS2 BARGUETTE PALE BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $127.54 27 bids
16 minutes 1.49CTS 7MM VS2 ROUND FANCY BLUE LAB CERTIFIED LOOSE NATURAL DIAMOND $143.5 23 bids
26 minutes 1.98CTS 8MM VS2 EMERALD H COLOR WHITE LAB CERTIFIED LOOSE NATURAL DIAMOND $306.0 36 bids
31 minutes 1.74CTS 7MM VS2 ROUND UNTREAT CHAMPAGNE YELLOW CERTIFIED LOOSE NATURAL DIAMOND $125.0 46 bids
36 minutes Cert 0.36 Carat Fancy Orange VS2 Cushion Natural Loose Diamond 4.45x3.64mm 2VG $283.79 1 bid 1 hour 48 minutes
Certified 0.59 Carat I Color VS2 Oval Natural Loose Diamond 5.84x4.55mm 2VG $142.5 12 bids 1 hour 58 minutes
Certified 1.41 Carat G SI2 Round Brilliant Enhanced Natural Loose Diamond 7.24mm $615.0 20 bids 2 hours 48 minutes
Loose natural Diamond Rounds (matching Pair ) 1.44 Ct VS1 Blue Color $122.5 24 bids 4 hours 9 minutes
Loose natural Diamond Princess 1.04 Ct VS1 Natural Clarity Fancy Vivid Blue $336.0 11 bids 4 hours 22 minutes
Loose natural Cushion Diamond 1.05 Ct VVS1 H Color $340.0 10 bids 4 hours 24 minutes
Loose natural Diamond Heart 0.25 Ct Flawless Fancy Blue Color $107.5 10 bids 4 hours 34 minutes
Loose natural Diamond Round 1.05 ct Flawless Fancy Yellow $260.0 23 bids 4 hours 38 minutes
Loose natural Diamond Radiant 1.03 ct VS1 Fancy Blue color $410.0 17 bids 4 hours 39 minutes
Loose natural Diamond Round 0.51 ct Flawless Fancy Light Pink $111.5 22 bids 4 hours 42 minutes
Loose natural Diamond Round 1.02 ct Flawless Fancy Light Pink $406.0 47 bids 4 hours 45 minutes
Loose natural Diamond Round 1.04 ct Flawless Fancy Blue $152.5 21 bids 4 hours 50 minutes
Loose natural Diamond Round 1.05 ct Flawless Fancy Orange $197.5 24 bids 4 hours 53 minutes
Cert 0.96 Carat Yellow Brown VVS2 Round Brilliant Enhanced Natural Diamond 6.45m $201.0 21 bids 7 hours 38 minutes
IGI certified 2.65CT 8.78 X 8.83 X 5.6mm Round Fancy Blue color loose diamond $827.0 14 bids 9 hours 22 minutes
46.01 ct VVS1/21mm Huge Gray Brown Cushion Excellent Cut MOISSANITE DIAMOND RING $199.0 14 bids 9 hours 55 minutes
Certified 1.55 Carat E VS2 Round Brilliant Enhanced Natural Loose Diamond 7.27mm $1375.0 17 bids 10 hours 28 minutes
Loose Marquise Shape 1.07ct Diamond $750.0 1 bid 10 hours 57 minutes
Cert 1.00 Carat Green Blue SI3 Round Brilliant Enhanced Natural Diamond 6.1mm $139.5 9 bids 22 hours 8 minutes
Round Cut Natural White Diamond 1.10 Ct Loose Certified Faceted VVS1 6 mm Size $575.0 42 bids 22 hours 59 minutes
White Diamond Certified Faceted 0.50 Ct Loose Round Cut Natural VVS1 4.9mm Size $186.5 52 bids 23 hours 1 minute
Loose natural Diamond Cushion 1.05 Ct Vvs1 Vivid Yellow Color $486.0 14 bids 1 day 4 hours 45 minutes
Loose natural Diamond Round 1.04 Ct VS1 Blue Color $108.5 18 bids 1 day 4 hours 48 minutes
Loose natural Diamond Round 1.05 ct VVS1 Light pink Color $123.6 57 bids 1 day 4 hours 52 minutes
Loose natural Diamond Cushion 1.06 Ct VVS1 Fancy Pink $107.5 10 bids 1 day 4 hours 54 minutes
Loose natural Diamond Round 1.05 ct VVS1 Purple color $250.0 35 bids 1 day 4 hours 59 minutes
Loose natural Diamond Pear 1.04 Ct VS1 D Color $212.5 7 bids 1 day 5 hours 3 minutes
2mm. Excellent Natural Diamond G H VVS1-2 0.50ct. / 16Pc. Lot Brilliant Round $179.99 1 bid 1 day 23 hours 15 minutes
1.00 Ct Natural White Diamond Certified Loose Diamond Cut Faceted Round VVS1 GF0 $102.5 31 bids 1 day 23 hours 17 minutes
Loose natural Diamond Round 1.04 ct VVS1 Light pink Color $122.6 14 bids 2 days 4 hours 52 minutes
Certified 0.80 Carat H SI3 Round Brilliant Enhanced Natural Loose Diamond 5.77mm $154.5 7 bids 2 days 21 hours 28 minutes
GIA Certified Diamond 3.32 karat $7877.0 57 bids 2 days 23 hours 3 minutes
Cert 0.51 Carat Sky Blue SI2 Round Brilliant Enhanced Natural Diamond 4.95mm $106.0 12 bids 3 days 48 minutes
IGI Laboratory Grown 1 Carat Square Emerald Cut Diamond with Report $306.0 2 bids 3 days 3 hours 37 minutes
Loose natural Diamond Pear 1.04 Ct VS1 Vivid Blue Color $202.5 10 bids 3 days 4 hours 55 minutes
GIA loose certified .33ct VS1 I Marquise natural fancy cut diamond estate $299.99 1 bid 3 days 10 hours 35 minutes
0.10Ct GORGEOUS ! UNTREATED FANCY PINK DIAMOND FROM ARGYLE $101.99 1 bid 3 days 14 hours 15 minutes
Cert 1.02 Carat Fancy Vivid Brown SI2 Round Brilliant Natural Diamond 6.22mm $207.5 10 bids 3 days 21 hours 48 minutes
Cert 1.65 Carat Light Silver SI2 Round Brilliant Enhanced Natural Diamond 7.53mm $224.5 5 bids 3 days 21 hours 48 minutes
Loose natural Diamond Pear 0.80 Ct VVS1 Fancy Pink EX EX EX $101.0 14 bids 4 days 5 hours 50 minutes
Loose natural Diamond Trillion 2.04 ct (2 Diamonds) VS1 Fancy Blue color $308.0 7 bids 4 days 6 hours 5 minutes
Certified 1.12 Carat E VS2 Round Brilliant Enhanced Natural Diamond 6.39mm 3VG $597.0 14 bids 4 days 6 hours 58 minutes
loose .28ct EGL USA certified marquise Natural fancy cut diamond SI3 J estate $224.98 1 bid 4 days 7 hours 57 minutes
Certified 1.01 Carat F SI2 Round Brilliant Enhanced Natural Loose Diamond 6.1mm $102.5 4 bids 5 days 2 hours 28 minutes
Loose natural Diamond Oval 2.02 Ct VS Fancy Vivid Blue Color $102.5 8 bids 5 days 4 hours 5 minutes
Cert 1.18 Carat TTL Brown SI2 Round Brilliant Enhanced Natural Diamond 6.57m 3VG $102.5 8 bids 5 days 4 hours 8 minutes