Cool Stuff Auctions – Fine Lab Grown Diamond Jewelry Sale

Auction Details

Welcome to Cool Stuff Auctions' Fine Lab Grown Diamond Jewelry Sale! This is your opportunity to bid on an exceptional collection of over 1,000 lab grown diamond pieces, including tennis bracelets, fancy multi-shape bracelets, and chain bracelets — all set in 14K white gold, 14K yellow gold, and platinum.



Every piece features lab grown diamonds graded F+ in color and VS1+ in clarity, offering the same brilliance and quality as mined diamonds at a fraction of the retail price. Whether you're treating yourself or finding the perfect gift, this sale has something for every jewelry lover.



All items ship worldwide. Questions welcome — happy bidding!
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Lab Grown Diamond Tennis Necklace Extender 2 CTTW, 14K White Gold1051 - Lab Grown Diamond Tennis Necklace Extender 2 CTTW, 14K White Gold
Cool Stuff Auctions
A substantial 2-carat lab grown diamond tennis necklace extender in gleaming 14K white gold. F+ colour and VS1+ clarity round brilliant lab grown diam
No Bids Yet
Start Price : 1,800.00
 
 
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Lab Grown Diamond Tennis Necklace Extender 2 CTTW, 14K White Gold1052 - Lab Grown Diamond Tennis Necklace Extender 2 CTTW, 14K White Gold
Cool Stuff Auctions
A substantial 2-carat lab grown diamond tennis necklace extender in gleaming 14K white gold. F+ colour and VS1+ clarity round brilliant lab grown diam
No Bids Yet
Start Price : 1,800.00
 
 
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Lab Grown Diamond Tennis Necklace Extender 2 CTTW, 14K White Gold1053 - Lab Grown Diamond Tennis Necklace Extender 2 CTTW, 14K White Gold
Cool Stuff Auctions
A substantial 2-carat lab grown diamond tennis necklace extender in gleaming 14K white gold. F+ colour and VS1+ clarity round brilliant lab grown diam
No Bids Yet
Start Price : 1,800.00
 
 
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Lab Grown Diamond Tennis Necklace Extender 3 CTTW, 14K White Gold1054 - Lab Grown Diamond Tennis Necklace Extender 3 CTTW, 14K White Gold
Cool Stuff Auctions
Three carats of round brilliant lab grown diamonds in a premium 14K white gold tennis necklace extender — a significant piece of f
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Start Price : 2,500.00
 
 
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Lab Grown Diamond Tennis Necklace Extender 3 CTTW, 14K White Gold1055 - Lab Grown Diamond Tennis Necklace Extender 3 CTTW, 14K White Gold
Cool Stuff Auctions
Three carats of round brilliant lab grown diamonds in a premium 14K white gold tennis necklace extender — a significant piece of f
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Start Price : 2,500.00
 
 
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1 CTTW Princess & Emerald Lab Grown Diamond Chevron Necklace, 14K White Gold1056 - 1 CTTW Princess & Emerald Lab Grown Diamond Chevron Necklace, 14K White Gold
Cool Stuff Auctions
A bold geometric statement — this chevron necklace combines princess and emerald-cut lab grown diamonds in a dynamic V-shaped desi
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Start Price : 1,900.00
 
 
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1 CTTW Marquise Lab Grown Diamond Curve Necklace in 14K White Gold1057 - 1 CTTW Marquise Lab Grown Diamond Curve Necklace in 14K White Gold
Cool Stuff Auctions
Marquise lab grown diamonds — with their dramatic pointed ends and extraordinary coverage — are artfully arran
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Start Price : 1,800.00
 
 
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0.30 CTTW Round Lab Grown Diamond Cross Pendant in 14K White Gold1058 - 0.30 CTTW Round Lab Grown Diamond Cross Pendant in 14K White Gold
Cool Stuff Auctions
A beautifully crafted lab grown diamond cross pendant in lustrous 14K white gold, set with 0.30 carats of round brilliant F+ colour, VS1+ clarity lab
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Start Price : 300.00
 
 
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0.90 CTTW Emerald-Cut Lab Grown Diamond Bar Pendant in 14K Yellow Gold1059 - 0.90 CTTW Emerald-Cut Lab Grown Diamond Bar Pendant in 14K Yellow Gold
Cool Stuff Auctions
A sleek, modern bar pendant set with emerald-cut lab grown diamonds in warm 14K yellow gold. Totalling 0.90 carats at F+ colour and VS1+ clarity, the
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Start Price : 1,600.00
 
 
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0.5 CTTW Round Lab Grown Diamond Eternity Ring in 14K Yellow Gold1060 - 0.5 CTTW Round Lab Grown Diamond Eternity Ring in 14K Yellow Gold
Cool Stuff Auctions
The eternity ring — a circle of lab grown diamonds symbolising unending love — is realised here with 0.50 cara
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Start Price : 400.00
 
 
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1 CTTW Round Lab Grown Diamond Eternity Ring in 14K Yellow Gold1061 - 1 CTTW Round Lab Grown Diamond Eternity Ring in 14K Yellow Gold
Cool Stuff Auctions
One full carat of round brilliant lab grown diamonds forms an unbroken circle in warm 14K yellow gold — an eternity ring of timele
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Start Price : 600.00
 
 
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0.5 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold1062 - 0.5 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
A graceful half-carat lab grown diamond eternity ring in polished 14K white gold — an enduring symbol of love and commitment. Roun
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Start Price : 400.00
 
 
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1 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold1063 - 1 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
One carat of round brilliant lab grown diamonds in pristine 14K white gold — the ultimate anniversary ring or stacking band. F+ co
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Start Price : 700.00
 
 
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1 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold1064 - 1 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
One carat of round brilliant lab grown diamonds in pristine 14K white gold — the ultimate anniversary ring or stacking band. F+ co
No Bids Yet
Start Price : 700.00
 
 
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2 CTTW Round Lab Grown Diamond Eternity Ring, 14K White Gold (US Size 7)1065 - 2 CTTW Round Lab Grown Diamond Eternity Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
Two carats of round brilliant lab grown diamonds in a full eternity ring of polished 14K white gold, sized at US 7. F+ colour and VS1+ clarity stones
No Bids Yet
Start Price : 1,000.00
 
 
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2 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold1066 - 2 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
Two carats of round brilliant lab grown diamonds form an unbroken circle of brilliance in radiant 14K white gold. At F+ colour and VS1+ clarity, the l
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Start Price : 1,100.00
 
 
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2 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold1067 - 2 CTTW Round Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
Two carats of round brilliant lab grown diamonds form an unbroken circle of brilliance in radiant 14K white gold. At F+ colour and VS1+ clarity, the l
No Bids Yet
Start Price : 1,100.00
 
 
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5 CTTW Round Lab Grown Diamond Eternity Ring, 14K White Gold (US Size 7)1068 - 5 CTTW Round Lab Grown Diamond Eternity Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
Five spectacular carats of round brilliant lab grown diamonds encircle the finger in this magnificent 14K white gold full eternity ring, sized US 7. F
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Start Price : 2,200.00
 
 
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7 CTTW Round Lab Grown Diamond Eternity Ring, 14K White Gold (US Size 7)1069 - 7 CTTW Round Lab Grown Diamond Eternity Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
Seven carats of round brilliant lab grown diamonds form a complete, unbroken circle of brilliance in this awe-inspiring 14K white gold eternity ring.
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Start Price : 4,200.00
 
 
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0.5 CTTW Round Lab Grown Diamond Eternity Ring in 14K Rose Gold1070 - 0.5 CTTW Round Lab Grown Diamond Eternity Ring in 14K Rose Gold
Cool Stuff Auctions
Rose gold's romantic, warm blush creates the perfect backdrop for this 0.50-carat round brilliant lab grown diamond eternity ring. F+ colour and...
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Start Price : 400.00
 
 
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1 CTTW Round Lab Grown Diamond Eternity Ring in 14K Rose Gold1071 - 1 CTTW Round Lab Grown Diamond Eternity Ring in 14K Rose Gold
Cool Stuff Auctions
One carat of round brilliant lab grown diamonds glows warmly in this romantic 14K rose gold eternity ring. The blush-toned setting beautifully enhance
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Start Price : 600.00
 
 
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4.9 CTTW Emerald-Cut Lab Grown Diamond Eternity Ring in 14K White Gold1072 - 4.9 CTTW Emerald-Cut Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
Nearly five carats of emerald-cut lab grown diamonds create a striking, glamorous eternity ring in polished 14K white gold. The step-cut facets of eac
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Start Price : 2,400.00
 
 
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2 CTTW Emerald-Cut Lab Grown Diamond Eternity Ring in 14K White Gold1073 - 2 CTTW Emerald-Cut Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
Two carats of elegant emerald-cut lab grown diamonds encircle the finger in this sleek 14K white gold eternity ring. The step-cut stones deliver a dra
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Start Price : 1,500.00
 
 
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4 CTTW Oval Lab Grown Diamond Eternity Ring in 14K White Gold1074 - 4 CTTW Oval Lab Grown Diamond Eternity Ring in 14K White Gold
Cool Stuff Auctions
Four carats of oval-cut lab grown diamonds form a luxuriously continuous band in gleaming 14K white gold. Oval lab grown diamonds appear significantly
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Start Price : 2,200.00
 
 
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3 CTTW Oval & Emerald-Cut Lab Grown Diamond Eternity Ring, 14K White Gold1075 - 3 CTTW Oval & Emerald-Cut Lab Grown Diamond Eternity Ring, 14K White Gold
Cool Stuff Auctions
A sophisticated alternating design featuring oval and emerald-cut lab grown diamonds in pristine 14K white gold — three carats of
No Bids Yet
Start Price : 1,700.00
 
 
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2 CTTW Round Lab Grown Diamond Solitaire Ring in 14K White Gold1076 - 2 CTTW Round Lab Grown Diamond Solitaire Ring in 14K White Gold
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Two carats of round brilliant lab grown diamond in a classic solitaire setting — the most celebrated ring design in jewellery hist
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Start Price : 2,200.00
 
 
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0.70 CTTW Round Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1077 - 0.70 CTTW Round Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
A beautifully proportioned 0.70-carat round brilliant lab grown diamond solitaire in gleaming 14K white gold, perfectly sized at US 7. F+ colour and V
No Bids Yet
Start Price : 800.00
 
 
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5 CTTW Emerald-Cut Lab Grown Diamond Solitaire Ring in 14K White Gold1078 - 5 CTTW Emerald-Cut Lab Grown Diamond Solitaire Ring in 14K White Gold
Cool Stuff Auctions
Five carats in a single emerald-cut lab grown diamond solitaire — an extraordinary gemstone experience in polished 14K white gold.
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Start Price : 6,000.00
 
 
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0.70 CTTW Emerald-Cut Solitaire Ring, 14K Rose Gold (US Size 7)1079 - 0.70 CTTW Emerald-Cut Solitaire Ring, 14K Rose Gold (US Size 7)
Cool Stuff Auctions
An emerald-cut lab grown diamond solitaire in the romantic warmth of 14K rose gold — a contemporary and deeply individual pairing.
No Bids Yet
Start Price : 700.00
 
 
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0.50 CTTW Marquise Lab Grown Diamond Solitaire Ring, 14K Yellow Gold (US Size 7)1080 - 0.50 CTTW Marquise Lab Grown Diamond Solitaire Ring, 14K Yellow Gold (US Size 7)
Cool Stuff Auctions
A marquise lab grown diamond solitaire in warm 14K yellow gold — a finger-elongating, dramatically stylish ring choice at US size
No Bids Yet
Start Price : 700.00
 
 
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2 CTTW Marquise Lab Grown Diamond Solitaire Ring in 14K White Gold1081 - 2 CTTW Marquise Lab Grown Diamond Solitaire Ring in 14K White Gold
Cool Stuff Auctions
Two carats of marquise lab grown diamond in a stunning solitaire setting of 14K white gold — a ring with dramatic, duchess-worthy
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Start Price : 2,600.00
 
 
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2 CTTW Pear Lab Grown Diamond Solitaire Ring in 14K White Gold1082 - 2 CTTW Pear Lab Grown Diamond Solitaire Ring in 14K White Gold
Cool Stuff Auctions
A romantic two-carat pear-cut lab grown diamond solitaire ring in gleaming 14K white gold. The teardrop shape of the F+ colour, VS1+ clarity pear lab
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Start Price : 2,500.00
 
 
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0.20 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1083 - 0.20 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
Delicate and feminine, this 0.20-carat pear-cut lab grown diamond solitaire in 14K white gold is sized at US 7. The romantic teardrop shape of the F+
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Start Price : 600.00
 
 
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0.30 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1084 - 0.30 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
A graceful 0.30-carat pear-cut lab grown diamond solitaire in polished 14K white gold at US size 7. The F+ colour, VS1+ clarity pear stone shimmers wi
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Start Price : 600.00
 
 
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0.50 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1085 - 0.50 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
Half a carat of pear-cut lab grown diamond in a fine 14K white gold solitaire ring at US size 7. The romantic teardrop form of the F+ colour, VS1+ cla
No Bids Yet
Start Price : 800.00
 
 
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0.50 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1086 - 0.50 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
Half a carat of pear-cut lab grown diamond in a fine 14K white gold solitaire ring at US size 7. The romantic teardrop form of the F+ colour, VS1+ cla
No Bids Yet
Start Price : 800.00
 
 
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0.70 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1087 - 0.70 CTTW Pear Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
A beautifully proportioned 0.70-carat pear-cut lab grown diamond solitaire in 14K white gold, sized at US 7. F+ colour and VS1+ clarity make this roma
No Bids Yet
Start Price : 700.00
 
 
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0.70 CTTW Oval Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)1088 - 0.70 CTTW Oval Lab Grown Diamond Solitaire Ring, 14K White Gold (US Size 7)
Cool Stuff Auctions
An oval-cut lab grown diamond solitaire — the most coveted ring shape of recent decades — in gleaming 14K whit
No Bids Yet
Start Price : 800.00
 
 
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0.70 CTTW Oval Lab Grown Diamond Solitaire Ring, 14K Rose Gold (US Size 7)1089 - 0.70 CTTW Oval Lab Grown Diamond Solitaire Ring, 14K Rose Gold (US Size 7)
Cool Stuff Auctions
An oval lab grown diamond solitaire in blush-toned 14K rose gold — a deeply romantic and fashionable ring combination at US size 7
No Bids Yet
Start Price : 800.00
 
 
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1 CTTW Two-Stone Round Lab Grown Diamond Ring, 14K White Gold (US Size 7)1090 - 1 CTTW Two-Stone Round Lab Grown Diamond Ring, 14K White Gold (US Size 7)
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Two round brilliant lab grown diamonds — symbolising two souls, two milestones, two chapters — are united in p
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Start Price : 800.00
 
 
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0.90 CTTW Marquise & Round Two-Stone Lab Grown Diamond Ring, 14K White Gold1091 - 0.90 CTTW Marquise & Round Two-Stone Lab Grown Diamond Ring, 14K White Gold
Cool Stuff Auctions
A beautiful pairing of marquise and round brilliant lab grown diamonds totalling 0.90 carats in polished 14K white gold, sized US 7. The contrast of s
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Start Price : 800.00
 
 
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2 CTTW Emerald & Pear Lab Grown Diamond Two-Stone Ring in 14K White Gold1092 - 2 CTTW Emerald & Pear Lab Grown Diamond Two-Stone Ring in 14K White Gold
Cool Stuff Auctions
An artistically composed two-stone ring pairing an emerald-cut with a pear-cut lab grown diamond in gleaming 14K white gold — two
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Start Price : 3,200.00
 
 
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0.70 CTTW Pear & Round Two-Stone Lab Grown Diamond Ring, 14K White Gold1093 - 0.70 CTTW Pear & Round Two-Stone Lab Grown Diamond Ring, 14K White Gold
Cool Stuff Auctions
A charming pear and round brilliant lab grown diamond two-stone ring in 14K white gold at US size 7. Totalling 0.70 carats of F+ colour, VS1+ clarity
No Bids Yet
Start Price : 800.00
 
 
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1 CTTW Pear & Emerald Two-Stone Lab Grown Diamond Ring, 14K White Gold1094 - 1 CTTW Pear & Emerald Two-Stone Lab Grown Diamond Ring, 14K White Gold
Cool Stuff Auctions
A pear and emerald-cut lab grown diamond paired in one carat of fine lab grown diamond artistry — this 14K white gold two-stone ri
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Start Price : 700.00
 
 
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1.8 CTTW Emerald & Trillion Three-Stone Lab Grown Diamond Ring, 14K White Gold1095 - 1.8 CTTW Emerald & Trillion Three-Stone Lab Grown Diamond Ring, 14K White Gold
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A classically inspired three-stone ring featuring an emerald-cut centre flanked by trillion-cut side lab grown diamonds, totalling 1.80 carats in poli
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Start Price : 2,100.00
 
 
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0.40 CTTW Marquise Three-Stone Lab Grown Diamond Ring, 14K White Gold1096 - 0.40 CTTW Marquise Three-Stone Lab Grown Diamond Ring, 14K White Gold
Cool Stuff Auctions
Three marquise-cut lab grown diamonds line up in a sleek, architecturally bold three-stone design in 14K white gold, sized US 7. Totalling 0.40 carats
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Start Price : 800.00
 
 
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