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HRD Certified 1.03ct Old-European Cut Diamond
Located in Esch sur Alzette, Esch-sur-Alzette
The HRD Certified 1.03ct Old-European Cut Diamond is a captivating gemstone known for its vintage
Category

Early 20th Century European Art Deco Loose Gemstones

Materials

Diamond

Certified Old Mine Cut Diamond, 1.49 Carat G SI1
Located in Antwerpen, BE
, this Old Mine Cut has its own distinct character and charm. It is a piece of diamond history and
Category

Antique Early 18th Century Unknown Artisan Loose Gemstones

Materials

Diamond, White Diamond

Certified Old Mine Cut Diamond, 1.49 Carat G SI1
Certified Old Mine Cut Diamond, 1.49 Carat G SI1
Free Shipping
W 0.29 in D 0.18 in L 0.28 in
Certified Old Mine Cut Diamond, 1.73 Carat F VS2
Located in Antwerpen, BE
, this Old Mine Cut has its own distinct character and charm. It is a piece of diamond history and
Category

Antique Early 18th Century Unknown Artisan Loose Gemstones

Materials

Diamond, White Diamond

Certified Old Mine Cut Diamond, 1.73 Carat F VS2
Certified Old Mine Cut Diamond, 1.73 Carat F VS2
Free Shipping
W 0.29 in D 0.23 in L 0.27 in
Beauvince 11.98 Ct OVS1 GIA Old European Cut Diamond Ring
By Beauvince Jewelry
Located in New York, NY
ct Old European Cut O-P color VS1 clarity Fluorescence - None Measurements - 14.35 - 14.64 mm x 9.31
Category

2010s Loose Gemstones

Materials

Diamond

GIA Certified 3.58 Carat Old Cut Natural Diamonds (Customization Option)
Located in London, GB
GIA Certified 1.79+1.79 Carat Old Cut Natural Diamonds (Customization Option Available) I. Old
Category

2010s Loose Gemstones

Materials

Diamond

LFG Certified 3.78 K/VS1 Antique Old European Round Brilliant Cut Diamond
Located in Paris, FR
This Antique Old European Round Brilliant cut Diamond weights 3.78 carats with a K color (Beautiful
Category

Vintage 1910s Unknown Belle Époque Loose Gemstones

Materials

Diamond

Antique Marquise Cut Diamond 2.19ct True Old Natural Diamond KL VS-SI1
Located in Overland Park, KS
Listed is a very tough to find antique marquise cut natural diamond. This is a true old stone
Category

Early 20th Century Art Deco Loose Gemstones

Materials

Diamond

LFG Certified 2.12 J/VVS2 Antique Old Mine Cushion Brilliant Cut Diamond
Located in Paris, FR
This Antique Old Mine Cushion Brilliant cut Diamond weights 2.12 carats with a J color (Beautiful
Category

Vintage 1910s Unknown Belle Époque Loose Gemstones

Materials

Diamond

Antique Old European Round Brilliant Cut Diamond Weights 3 Carats With a K Color
Located in Milano, MI
This Antique Old European Round Brilliant cut Diamond weights 3 carats with a K color (Beautiful
Category

20th Century Italian Late Victorian Loose Gemstones

Materials

Diamond

8.88 D IF GIA Certified Old Cut Pear Shape
Located in kOWLOON, HK
: Old Cut Pear Shape Weight: 8.88 CT Color: D Clarity: IF Polish: Excellent Symmetry: Very Good
Category

2010s Indian Modern Loose Gemstones

Materials

Diamond

8.88 D IF GIA Certified Old Cut Pear Shape
8.88 D IF GIA Certified Old Cut Pear Shape
W 0.96 in D 0.19 in L 0.42 in
GIA Certified 10.08 Old Mine Rectangular Brilliant W-X, SI2 Natural Diamond
Located in New York, NY
ITEM DESCRIPTION ID #: NYC57282 Stone Shape: Modified Rectangular Brilliant Diamond Weight: 10.08
Category

Late 20th Century Loose Gemstones

Materials

Diamond

GIA Certified 10.08 Old Mine Rectangular Brilliant W-X, SI2 Natural Diamond
Located in New York, NY
ITEM DESCRIPTION ID #: NYC57282 Stone Shape: Modified Rectangular Brilliant Diamond Weight: 10.08
Category

Antique Early 1800s Art Deco Loose Gemstones

Materials

Diamond

Certified 1.20 Ct No heat Padparadscha Sapphire Ceylon Origin Ring Gemstone
Located in Makola, LK
Lanka (Ceylon) • Color(s): Pinkish Orange • Shape/Cutting Style: Heart • Cut: Wellcut • Dimensions
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Diamond, Pink Diamond, Sapphire, Pink Sapphire, Padparadscha Sapphire

Certified 1.12ct Natural Vivid Pink Sapphire Unheated Gemstone Ring Gemstone
Located in Makola, LK
, geologically speaking is an extremely old country. Ninety percent of the rocks of the island are of Precambrian
Category

21st Century and Contemporary Sri Lankan Loose Gemstones

Materials

Pink Diamond, Ruby, Pink Sapphire, Purple Sapphire, Padparadscha Sapphire

GRS SWISS LAB Certified 2.89 Carat RUBY (BURMA) Un heat
Located in Taipei, TW
are not as fine as the old Burma rubies and often go through heat treatment to improve their color and
Category

21st Century and Contemporary Burmese Loose Gemstones

Materials

Ruby

Certified 5.15 ct Natural Yellow Sapphire Ceylon Origin Ring Stone
Located in Makola, LK
• Cut: Excellent Cut • Dimensions: 12.1mm x 9.9mm x 7.9mm • Calibrated: yes • Clarity Grade: Internally
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

White Diamond, Yellow Diamond, Yellow Sapphire, Padparadscha Sapphire

Natural Blue Sapphire Ceylon Origin Ring Gemstone 1.53 Carats GIC certified
Located in Makola, LK
• Origin: Sri Lanka (Ceylon) • Color(s): Cornflower Blue (rich blue) • Shape/Cutting Style: Cushion • Cut
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Purple Sapphire, Pink Sapphire, Blue Sapphire, Blue Diamond, Diamond

Certified Natural Pink Sapphire Gemstone 0.45 Carat Ceylon Origin Ring Gemstone
Located in Makola, LK
) • Color(s): Baby pink • Shape/Cutting Style: Trillion • Cut: Excellent Cut • Dimensions: 5.0mm x 5.1mm x
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Pink Diamond, Pink Sapphire

Certified 2.05 carat Blue Sapphire Pear Shape Ceylon Origin Ring Stone
Located in Makola, LK
Sapphire • Origin: Sri Lanka (Ceylon) • Color(s): Vivid Blue • Shape/Cutting Style: Pear • Cut: Excellent
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Blue Diamond, Blue Sapphire

Certified 4.45 ct Natural Yellow Sapphire Pear Shape Ceylon Origin Ring Stone
Located in Makola, LK
: Yellow Sapphire • Origin: Sri Lanka (Ceylon) • Color(s): Vivid Yellow • Shape/Cutting Style: Pear • Cut
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Yellow Diamond, Yellow Sapphire, Padparadscha Sapphire

Certified 1.30 carat Blue Sapphire Pear Shape Ceylon Origin Ring Stone
Located in Makola, LK
• Cut: Excellent Cut • Dimensions: 7.1mm x 8.5mm x 4.8mm • Calibrated: yes • Clarity Grade: Internally
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Blue Topaz, Blue Sapphire, Blue Diamond

Certified 1.85 Ct Unheated Pink Sapphire Ceylon Origin Ring Gemstone
Located in Makola, LK
• Origin: Sri Lanka (Ceylon) • Color(s): Pink • Shape/Cutting Style: Oval • Cut: Wellcut • Dimensions
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Pink Diamond, Pink Sapphire, Padparadscha Sapphire

Certified 2.55 Ct No heat Royal Blue Sapphire Ceylon Origin Ring Gemstone
Located in Makola, LK
blue • Shape/Cutting Style: Oval • Cut: Wellcut • Dimensions: 8.66mm x 7.20mm x 4.76mm • Calibrated: No
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Purple Sapphire, Blue Sapphire, Blue Diamond

1.15 ct Natural Pink Spinel Gemstone Ceylon Origin
Located in Makola, LK
Ceylon Pink Spinel 1.10 Carats unheated come with Pink color and luster and perfect cut, unheated
Category

21st Century and Contemporary Sri Lankan Loose Gemstones

Materials

Pink Sapphire, Spinel, Pink Diamond

1.15 ct Natural Pink Spinel Gemstone Ceylon Origin
1.15 ct Natural Pink Spinel Gemstone Ceylon Origin
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W 5.2 in D 4.5 in L 7.6 in
Certified 1.08 Ct Unheated Blue Sapphire Ceylon Origin Ring Gemstone
Located in Makola, LK
) • Color(s): cornflower blue • Shape/Cutting Style: Oval • Cut: Wellcut • Dimensions: 5.35.5mm x 5.92mm x
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Blue Diamond, Blue Sapphire, Spinel, Purple Sapphire

Georgian 1.69 carats Old Mine Cut Loose Diamond With Ring
Located in London, GB
This exquisite 1.69 carat old mine cut diamond ring is truly a timeless treasure. Crafted with
Category

Antique 19th Century British Georgian Wedding Rings

Materials

Diamond, White Gold

Antique 2.74ct dormeuse old european cut diamond earrings
Located in Malmö, SE
wearing these we know why! Two large old european cut diamonds, approx. 1.32ct (L,si2) and 1.22ct (M, P1
Category

Antique Early 1900s European Victorian Lever-Back Earrings

Materials

Diamond, Gold, 18k Gold, Yellow Gold, Silver

1930's Art Deco Old Cut Diamond 18 Karat Gold Platinum Bow Ring
Located in Rotterdam, NL
A magnificent 18 karat gold and platinum old cut diamond bow ring. The ring dates from the 1930's
Category

Early 20th Century European Art Deco Engagement Rings

Materials

Diamond, 18k Gold, Platinum, Gold

Antique German Ring 1.4ctw old cut Diamonds solid 12K Gold Silver ØUS8/ 3.6gr
Located in SE
fit and measures 16mm x 14.75mm x 8.25mm deep. Central Diamond is of irregular old European round cut
Category

Antique 19th Century European Art Nouveau Wedding Rings

Materials

Diamond, 18k Gold, Silver, 10k Gold

Old Austrian Ring Diamonds 14K Yellow White Gold Ø7.75US/ 2.5gr
Located in SE
9.35 mm x 3.15mm deep with bezel set eight cut Diamond stone (natural) Ø 3 x 1.6 mm deep / ca. 0.1 ct
Category

Vintage 1920s Austrian Art Deco Cluster Rings

Materials

Diamond, 14k Gold

1931 old Ring 1ct Emerald 0.5ctw Diamonds solid 18K Gold Silver ØUS5.5/6.6gr
Located in SE
solid 18ct Yellow Gold holding natural Emerald stone and four rose-cut Diamonds set in Silver clusters
Category

Vintage 1930s Swedish Art Deco Dome Rings

Materials

Diamond, Emerald, 18k Gold, Silver

Old Ring Bague au Firmament Diamond Blue Enamel 18K Gold Ø5.75 US/ 5.5 gr
Located in SE
. Enamel was applied on a Platinum or White Gold base. Eight - cut Diamond set in Platinum/ or white Gold
Category

Vintage 1920s Italian Empire Cluster Rings

Materials

Diamond, 18k Gold, Enamel, Platinum

Old Danish Ring Citrine solid 14K Gold Ø 4.75 US/ 6.2 gr
Located in SE
. WEIGHT OF THE STONES The cuts of the stones that you may see on many of the older jewelry items are
Category

Vintage 1920s Danish Art Deco Cluster Rings

Materials

Citrine, 18k Gold

Portrait of a Lady with Crimson Wrap & Fur c.1675 Fine Dutch Old Master Painting
Located in London, GB
scarlet silk drapery is held in place by two huge gold and pearl brooches. A huge diamond, pearl, and
Category

17th Century Old Masters Portrait Paintings

Materials

Canvas, Oil

Indian Diamond Bracelet
Located in Orimattila, FI
and big diamonds There are 925 stamps on the jewelry The jewelry looks old, but I don’t know its age
Category

Late 20th Century Pakistani Victorian Link Bracelets

Materials

Diamond, Sterling Silver

Indian Diamond Bracelet
Indian Diamond Bracelet
W 1.19 in L 7.09 in
Art Deco 1930's Diamond Platinum Bow Brooch
Located in Rotterdam, NL
1930s and has a beautiful openwork and leave design which is set with old cut diamonds. The diamonds
Category

Early 20th Century European Art Deco Brooches

Materials

Diamond, Platinum

Antique German Pendant Diamond solid 18K Gold /1.5gr
Located in SE
. WEIGHT OF THE STONES The cuts of the stones that you may see on many of the older jewelry items are
Category

Vintage 1930s German Art Nouveau Pendant Necklaces

Materials

Diamond, 18k Gold

1935 Three 0.45ctw Diamonds Ring solid Platinum Ø 6.5US / 1.8gr
Located in SE
Nice ring hand -made in 1932 . Combination of Platinum and three natural Diamonds of old European
Category

Vintage 1930s Swedish Retro Three-Stone Rings

Materials

Diamond, Sapphire, Platinum

Antique Nordic Picture Pendant Locket Diamond solid 18K Gold /5gr
Located in SE
Antique 18K Yellow Gold Pendant Locket with a diamond cut Diamond in white Gold rhombus shaped
Category

Vintage 1930s Swedish Art Nouveau Pendant Necklaces

Materials

Diamond, 18k Gold

Art Deco Pearl Single Strand Sapphire Diamond 18 Kt Clasp
Located in Napoli, IT
, platinum topped, gorgeous stone setting with a centre old mine cut Diamond of .20 Ct flanked by 2 natural
Category

Vintage 1920s European Art Deco Beaded Necklaces

Materials

Diamond, Pearl, Sapphire, 18k Gold

Antique Alliance Ring Diamonds solid 14K Orange Gold Ø US7.75 /5.7gr
Located in SE
hallmarks. Rhombus shaped clusters in White Gold or Platinum with 4 old diamond cut Diamonds of equal
Category

Vintage 1920s European Retro Solitaire Rings

Materials

Diamond, 14k Gold

Vintage Earrings 0.2ctw Diamonds Pearls solid 18K Gold /1.5 gr
Located in SE
diamond cut Diamond stones ca. 0.01 ct each / 0.2ctw. All diamonds with open backs. Color ca. ca. G,H /VS
Category

Vintage 1950s European Art Deco Stud Earrings

Materials

Diamond, Pearl, 18k Gold

Antique Halo Ring 0.55 Diamonds solid 14K Gold 4.25US/ 2gr
Located in SE
Silver or White Gold set with 11 old diamond cut Diamonds. No hallmarks. Larger stone in the center Ø
Category

Antique Early 1900s European Art Deco Cluster Rings

Materials

Diamond, 14k Gold

1986 Nordic Alliance Wedding Ring Diamonds solid 18K Gold Ø US5.25 /2.4gr
Located in SE
diamond cut Diamonds Ø 1.8 mm / ca 0.025ct. each. Color ca. F,G / VS . All stones have open backs and
Category

Vintage 1980s Swedish Retro Wedding Rings

Materials

Diamond, 18k Gold

Antique German Pendant Seed Pearls and Diamond solid 14K Gold /1.2gr
Located in SE
, old diamond cut diamond stone Ø 2 mm / 0.03 ct, color ca.G, H / VVS. Finest used condition. No damage
Category

Antique Early 1900s German Art Nouveau Pendant Necklaces

Materials

Diamond, Pearl, 14k Gold

Antique Ring 1ctw Diamonds solid Silver Ø US5.5 /2.5 gr
Located in SE
Silver clusters. All stones have open backs. Largest stone in the center is of old European Diamond cut
Category

Early 20th Century European Arts and Crafts Cluster Rings

Materials

Diamond, Silver

1928 Nordic Ring Emerald Diamonds solid 18K Gold ØUS8 / 2gr
Located in SE
3.5 mm x 2.5 mm / ca.0.15 ct Emerald stone accented two diamonds of irregular old diamond cut Ø 2.5 mm
Category

Vintage 1920s Swedish Art Deco Cluster Rings

Materials

Diamond, Emerald, 18k Gold

Antique Cross Crucifix Diamonds solid 18K Gold Blue Enamel / 6.7 gr
Located in SE
Yellow Gold (tested) , enameled with cobalt Blue enamel and accented with 5old European diamond cut
Category

Antique Early 1900s European Art Nouveau Pendant Necklaces

Materials

Diamond, 18k Gold, Enamel

Antique Russian Bracelet 0.5ctw Diamonds 18KGold Platinum/ 14.8cm-18 cm/10.5gr
Located in SE
five old diamond cut Siberian Diamonds and 14 rose cut Diamonds. Hallmarked with Swedish import
Category

Antique Early 1900s European Art Nouveau Link Bracelets

Materials

Diamond, 18k Gold, Platinum

1967 Nordic Alliance Wedding Ring Diamonds solid 18K Gold ØUS6.25/ 3.1gr
Located in SE
diamond cut Diamonds Ø 1.75 mm / ca 0.02ct. each. Color ca. F,G / VVS . All stones have open backs and
Category

Vintage 1960s Swedish Retro Wedding Rings

Materials

Diamond, Platinum, 18k Gold

Antique Bracelet 0.7ctw Diamonds solid Rose 18K Gold Silver/ 18cm/ 7.9gr
Located in SE
Silver bezels fused to solid 18K Rose Gold base with 13 old diamond cut Diamonds gradually sized, total
Category

Antique Early 1900s European Art Nouveau Link Bracelets

Materials

Diamond, 18k Gold, Silver

Antique Italian Halo Ring Sapphire Diamonds 12K Ø 7.75US / 4.2gr
Located in SE
Italian Halo Ring with natural Blue - Green Sapphire and 12 rose-cut Diamonds. Hand-made between
Category

Vintage 1920s Italian Art Deco Cluster Rings

Materials

Diamond, Sapphire, 10k Gold, Silver

Vintage Ring Ruby Diamonds solid 18K Gold Ring Ø 7.5US / 2.3 gr
Located in SE
Vintage ca 1960s -1970s European ring in solid 18K Yellow Gold with claw set diamond cut natural
Category

Vintage 1960s European Retro Cluster Rings

Materials

Diamond, Ruby, 18k Gold

Antique Halo Ring Ruby Diamonds solid 14K Yellow Gold Ø4.5US / 3.2g
Located in SE
. 3.5 ct. 18 natural Diamonds of old European cut ca. Ø 1.75 mm / 0,025 ct each / ca. 0.45 ct total
Category

Vintage 1920s European Art Deco Cluster Rings

Materials

Diamond, Ruby, 14k Gold

Antique European Ring Diamonds solid 18K Gold Ø 9.75 US / 2.8gr
Located in SE
with pave set diamonds . All stones have their open backs. Diameter of the largest old European cut
Category

Vintage 1920s European Art Nouveau Engagement Rings

Materials

Diamond, 18k Gold, Platinum

Antique Danish Ring 1ctw. Diamonds 14K Green/White Gold ØUS8
Located in SE
others show old European diamond cut .. And three small Rose cut diamonds in the very center make it
Category

Vintage 1910s Danish Art Deco Cluster Rings

Materials

Diamond, 14k Gold, White Gold

1931 Nordic Ring 0.5ct. Diamonds solid 18K Gold Silver Ø US8.5 / 2.76gr
Located in SE
with a total of 19 Diamonds. The largest stone is an old European diamond cut Diamond Ø 4.5 mm x 2.7
Category

Vintage 1930s Swedish Art Deco Cluster Rings

Materials

Diamond, 18k Gold, Silver

1977 Halo Ring solid 18K Gold 2.45ct Sapphire 0.7ct Diamonds Ø6.5US/5.6g
Located in SE
British Cluster Halo Ring set with oval cut natural untreated Sapphire surrounded with 12 old
Category

Vintage 1970s English Retro Cluster Rings

Materials

Diamond, Sapphire, 18k Gold

Vintage 3 Stones Ring natural 0.75ct Sapphire Diamonds 14K Gold ØUS6 / 1.6gr
Located in SE
medium Blue / transparent Sapphire oval cut 6mm x 5 mm x 2.35 mm deep / 0.75 ct + 2 Diamonds Ø 1.5 mm
Category

Vintage 1970s Danish Retro Cluster Rings

Materials

Diamond, Sapphire, 14k Gold

Antique Art - Deco Ring 1.2ct Sapphire Diamonds solid Platinum ØUS 7.25 /3gr
Located in SE
Sapphires + two Ø 2 mm /0.03ct each old diamond cut Diamonds and 20 additional gradually sized rose cut
Category

Vintage 1920s German Art Deco Cluster Rings

Materials

Diamond, Sapphire, Platinum

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Loose Old Cut Diamond For Sale on 1stDibs

Surely you’ll find the exact loose old cut diamond you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Every item for sale was constructed with extraordinary care, often using gold, 18k gold and platinum. Find an antique version now, or shop for 15 vintage or 3 modern creation for a more contemporary example of these cherished accessories. Making the right choice when shopping for a loose old cut diamond may mean carefully reviewing examples of this item dating from different eras — you can find an early iteration of this piece from the 18th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. Creating a loose old cut diamond has been a part of the legacy of many jewelers, but those produced by Antinori Fine Jewels, Eytan Brandes and Kasturjewels are consistently popular. See these pages for an old mine cut iteration of this accessory, while there are also old european cut cut and brilliant cut cut versions available here, too. When shopping for a loose old cut diamond, you’ll find that there are less available pieces for unisex or men today than there are for women.

How Much is a Loose Old Cut Diamond?

Prices for a loose old cut diamond can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $692 and can go as high as $185,000, while this accessory, on average, fetches $5,255.
Questions About Loose Old Cut Diamond
  • 1stDibs ExpertMay 5, 2023
    How old an old European-cut diamond is varies. The old European cut is a precursor to the modern round brilliant cut. The stone appears circular when looked at from the top (because of its low table or largest facet) and has a high crown (the part above the middle of the stone) with larger facets. The tip of the stone, or the culet, is flat instead of pointed. This style was used predominantly in the 19th century, hence the name. It is best to consult a certified appraiser for assistance with dating and identifying antique jewelry. On 1stDibs, find a variety of European-cut diamond jewelry.
  • 1stDibs ExpertApril 5, 2022
    Mine cut diamonds are up to 300 years ago. Mine cut diamonds were popular around the 18th century during Victorian times and are still in high demand today. You’ll find a wide selection of mine cut diamond jewelry on 1stDibs.
  • 1stDibs ExpertFebruary 22, 2021
    Although old European cut diamonds are often priced lower than modern cuts, due to scarcity, they can sometimes be more valuable than modern cut diamonds.
  • 1stDibs ExpertApril 5, 2022
    Jewelry makers stopped using the old European cut for diamond and other gemstone jewelry around 1930. The style was common during the Art Deco period, but the brilliant cut became popular in the years that followed. On 1stDibs, shop a selection of Old European cut diamond gemstone jewelry.
  • 1stDibs ExpertFebruary 22, 2021
    Because the old mine cut is no longer used on diamonds, diamonds with this cut are rare and so you can often get quite a lot of money for them. Nevertheless, it is still dependent on the quality of the individual diamonds and on the color, clarity, cut and carat number.
  • 1stDibs ExpertAugust 24, 2021
    Yes, old European cut diamonds can be worth more than many other cut diamonds as they are not produced anymore. This cut was developed and popularized between the years 1890 and 1930 and is likely to be found in an antique ring belonging to this period and featuring a round-cut diamond.
  • 1stDibs ExpertFebruary 22, 2021
    Old mine cut diamonds are usually worth less than old european cut diamonds. Because they are generally 10-15% less expensive, they are often larger than other cut diamonds for engagement rings.
  • Like any other diamond, an old mine cut diamond's worth depends on a variety of factors. These factors include the 4C's (color, clarity, cut, carat), the overall beauty and "make" of the stone, the demand, supply, etc. On average however, old mine cuts are typically priced slightly lower (around 5-10%) than modern cut diamonds.