Skip to main content

Intense Blue Diamond

29
to
132
669
420
283
197
121
72
37
26
24
20
3
3
2
1
1
2
27
404
808
18
14
29
33
15
19
50
30
32
21
2
43
18
15
13
12
863
380
5
1,243
5
928
676
399
208
304
1,142
633
356
251
107
254
135
126
67
65
to
Sort By
Exceptional GIA Certified 1 Carat Fancy Intense Blue Diamond Ring
By Antinori Fine Jewels
Located in Rome, IT
Behold the extraordinary brilliance of our Exceptional GIA Certified 1 Carat Fancy Intense Blue
Category

2010s Italian Modern Engagement Rings

Materials

Diamond, Blue Diamond

Emilio Jewelry Gia Certified Fancy Intense Blue Diamond Ring
By Emilio!
Located in New York, NY
+ Fancy Intense Greenish Blue 44 white diamonds totaling about 0.28 carats, 8 pink diamonds totaling
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

Emilio Jewelry GIA Certified Fancy Intense Blue Diamond Ring
By Emilio!
Located in New York, NY
: 1.20 carat + Gia certified natural Fancy Intense pure Blue VS1 CUSHION Matching: White diamonds total
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

GIA Certified Fancy Intense Blue Heart Shape Diamond
By GEMME
Located in New York, NY
Over 2 Carat of Fancy Intense Blue Diamond
Category

2010s American Pendant Necklaces

Materials

Diamond

8 Carats GIA Certified Fancy & Intense Blue Circular Natural Colorless Diamonds
By Radiam Diamond Company
Located in Los Angeles, CA
Fancy Intense Blue diamonds. The first weighs 0.74 carats and is graded as a Fancy Intense Blue (GIA
Category

2010s North American Modern Clip-on Earrings

Materials

Diamond, 18k Gold

18kt Maria Gaspari Marquise Intense Blue Sapphire and Diamond Engagement Ring
Located in Antwerp, BE
ct Madagascar Intense Blue Diamonds: 22 diamonds 0.88 carat Material: 18kt white gold Ring size
Category

Vintage 1980s Contemporary Cocktail Rings

Materials

Diamond, Sapphire, Blue Sapphire, 18k Gold

GIA Certified 0.70 Carat Fancy Intese Blue Diamond VVS1 Loose Stone, Collector
Located in New York, NY
This is a gorgeous intense blue diamond. The color is borderline vivid so you will get a great deal
Category

2010s Israeli Contemporary Loose Gemstones

Materials

Diamond, Blue Diamond

Intense Blue Sapphire and Diamonds Ring
Located in Sežana, SI
brilliant cut diamonds, weighing ct. 1,35 total. 18K white gold. Italian production of the second half of
Category

Vintage 1960s Italian Contemporary Cocktail Rings

Materials

Diamond, Sapphire, Blue Sapphire, 18k Gold, White Gold

Blue Topaze Diamond Ear Dangles 11.81 carats 18Kt White Gold Intense Blue
Located in München, DE
A pair of eye-catching earrings featuring two Blue Topaz gemstones approx. 11.58 carats in total
Category

21st Century and Contemporary European Contemporary Stud Earrings

Materials

Diamond, Blue Topaz, White Gold

Intense Cornflower Blue Sapphire Cushion Cts 4.47 Diamond Engagement Ring
Located in Hong Kong, HK
, boasting a mesmerizingly intense cornflower blue hue—a true testament to its rarity and quality. It is
Category

2010s Hong Kong Contemporary Engagement Rings

Materials

Diamond, Blue Sapphire, 18k Gold

Emilio Jewelry GIA Certified 1.00 Carat Fancy Intense Pure Blue Diamond Ring
By Emilio!
Located in New York, NY
Gia certified natural fancy intense pure blue marquise shape diamond. This diamond is one of a kind
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

Fancy Blue-Green Diamond Earrings 0.27 Ct Fancy Intense Blue-Green/VS 18k Gold
Located in Darmstadt, DE
Fancy Blue-Green Diamond Earrings 0.27 Ct Fancy Intense Blue-Green/VS Exceptional, Intense Blue
Category

2010s German Modern Stud Earrings

Materials

Diamond, Blue Diamond, 18k Gold, White Gold

Emilio Jewelry GIA Certified 2.50 Carat Fancy Intense Greenish Blue Diamond Ring
By Emilio!
Located in New York, NY
certified natural fancy intense greenish blue diamond set in the center. If you wish for another look
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

David Rosenberg 4.16ct Cushion Fancy Intense Blue Green GIA Diamond Ring
By David Rosenberg
Located in Boca Raton, FL
Rosenberg Diamonds & Co. 4.16 carat Cushion Cut Fancy Intense Bluish Green is accompanied by a GIA
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Blue Diamond, Pink Diamond, 18k Gold, Rose Gold

Emilio Jewelry Gia Certified 1.25 Carat Fancy Intense Pure Blue Diamond Ring
By Emilio!
Located in New York, NY
pure blue diamond Shield cut with no overtone set in the center just over 1.25 carats. Uniquely enough
Category

21st Century and Contemporary Cocktail Rings

Materials

Blue Diamond

GIA Certified 5 Carat Intense BURMESE Blue No Heat Sapphire Diamond Ring
By Antinori Fine Jewels
Located in Rome, IT
Blue No Heat Sapphire Diamond Ring. Immerse yourself in the captivating allure of this exquisite ring
Category

2010s Italian Modern Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

Selected Intense Blue Tanzanite Ring White Gold with Diamonds VVS
By Angeletti
Located in Roma, IT
Selected intense blue tanzanite ring set in white gold with diamonds. A unique white gold ring
Category

2010s Italian Neoclassical Cocktail Rings

Materials

Tanzanite, Diamond, 18k Gold, White Gold

8.71 Carat Intense Blue Oval Natural Sapphire 14K Yellow Gold Diamond Ring
Located in Great Neck, NY
8.71 Carat Intense Blue Oval Cut Natural Sapphire Diamond 14K Yellow Gold Ring 8.71 Carats Natural
Category

2010s North American Bridal Rings

Materials

Diamond, Sapphire, Blue Sapphire, 14k Gold, White Gold, Yellow Gold

3.73 Carat London Blue Topaz and Diamond Halo Stud Earrings in 14W ref1130
By Diamond Town
Located in New York, NY
earrings are a stunning showcase of London Blue Topaz and white diamonds, expertly crafted to captivate the
Category

21st Century and Contemporary Contemporary Stud Earrings

Materials

Diamond, White Diamond, Topaz, Blue Topaz, 14k Gold, White Gold, Gold

GIA 3.68 Carat Pear Cut Fancy Intense Green-Blue Diamond Three Stone Ring
By Roman Malakov
Located in New York, NY
Diamonds showcasing a GIA Certified pear shape fancy intense green blue diamond weighing 3.68 carats total
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Blue Diamond, Pink Diamond, Platinum

1.29 Carat Intense Blue Pear Shape Natural Sapphire Diamond 14K White Gold Ring
Located in Great Neck, NY
1.29 Carat Intense Blue Pear Shape Cut Natural Sapphire Diamond 14K White Gold Ring 1.29 Carats
Category

2010s North American Bridal Rings

Materials

Diamond, Sapphire, Blue Sapphire, 14k Gold, White Gold

3.65 Carat Intense Blue Pear Shape Natural Sapphire Diamond 14K White Gold Ring
Located in Great Neck, NY
3.65 Carat Intense Blue Pear Shape Cut Natural Sapphire Diamond 14K White Gold Ring 3.65 Carats
Category

2010s North American Bridal Rings

Materials

Diamond, Sapphire, Blue Sapphire, 14k Gold, White Gold

1.29 Carat Intense Blue Pear Shape Natural Sapphire 14K White Gold Diamond Ring
Located in Great Neck, NY
1.29 Carat Intense Blue Pear Shape Cut Natural Sapphire Diamond 14K White Gold Ring 1.29 Carats
Category

2010s North American Bridal Rings

Materials

Diamond, Sapphire, Blue Sapphire, 14k Gold, White Gold

Selected Intense Blue Tanzanite Earrings White Gold with Diamonds, Matching Ring
By Angeletti
Located in Roma, IT
Selected Intense Blue Tanzanite Earrings Set in White Gold with Diamonds. Unique Earrings White
Category

2010s Italian Classical Roman Clip-on Earrings

Materials

Diamond, Tanzanite, 18k Gold, White Gold

Emilio Jewelry Gia Certified Intense Purple Diamond Ring
By Emilio!
Located in New York, NY
: 1.00 carat + Fancy Intense Pinkish Purple mounting: 3 fancy-turned marquise white diamonds totaling
Category

21st Century and Contemporary Cocktail Rings

Materials

Blue Diamond, Pink Diamond

8.71 Carat Intense Blue Oval Cut Natural Sapphire 14K Yellow Gold Diamond Ring
Located in Great Neck, NY
8.71 Carat Intense Blue Oval Cut Natural Sapphire Diamond 14K Yellow Gold Ring 8.71 Carats Natural
Category

2010s North American Bridal Rings

Materials

Diamond, Sapphire, Blue Sapphire, 14k Gold, White Gold, Yellow Gold

18k White Gold Halo/ Intense Blue Sapphire 6.39 Carats/ 132 Diamonds 0.66 Cts
Located in Birmingham, MI
spectacular blue. Pave'-set diamonds are encrusted in the shank. 132 diamonds in all, total 0.66carats
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Blue Sapphire, 18k Gold, White Gold

Scarselli GIA Fancy Intense Yellow Diamond Blue Floral Earrings By Rebecca Koven
By SCARSELLI
Located in New York, NY
using 18k Yellow Gold, 1.44 carats of natural, intense fancy yellow cushion-cut diamonds, white diamonds
Category

2010s American Contemporary Clip-on Earrings

Materials

Chalcedony, Yellow Diamond, Agate, White Diamond, 18k Gold

18kt White Gold Intense Blue NH Sapphire Ring, Baguette & Brilliant Cut Diamonds
Located in Antwerp, BE
Magnificent 18kt White Gold Intense Blue Sapphire Ring , Baguette & Brilliant cut Diamonds
Category

21st Century and Contemporary Belgian Artisan Engagement Rings

Materials

Diamond, Sapphire, 18k Gold, White Gold

Emilio Jewelry Gia Certified Fancy Intense Green Diamond Ring
By Emilio!
Located in New York, NY
Fifth Avenue, .88ct + Gia Certified natural Fancy Intense pure straight green Diamond center no
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

Dilys' 4.30ct 'Intense Bluish Violet' Tanzanite & Diamond Earrings
By Dilys'
Located in Hong Kong, HK
artisans. 2 IGI Certified 'Intense Bluish Violet' Tanzanites, totalling 4.30cts 40 Blue Sapphires
Category

2010s Hong Kong Contemporary Drop Earrings

Materials

Diamond, White Diamond, Blue Sapphire, Tanzanite, 18k Gold, White Gold, ...

FERRUCCI 23.88 Carat Intense Blue Aquamarine in 18k White Gold Diamond Ring
By FERRUCCI
Located in New York, NY
23.88 carat Natural Blue Ascher cut Aquamarine gemstone, of a high quality intense blue
Category

2010s American Art Nouveau Engagement Rings

Materials

Aquamarine, Diamond, 18k Gold, White Gold, Platinum

2.77 carat Intense blue Ceylon Sapphire/ 1.13cts diamond 950 platinum halo ring
Located in Birmingham, MI
A vivid blue 2.77 carats Ceylon Sapphire of incomparable color, radiates in talon prongs, framed in
Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Sapphire, Platinum

GIA Certied 6.70 Carat Vivid Intense Blue KASHMIR Sapphire Ring
By Antinori Fine Jewels
Located in Rome, IT
deep, Twilight Blue hue, earning it the prestigious "Twilight Blue" color award. Though minor color
Category

2010s Italian Modern Solitaire Rings

Materials

White Diamond, Sapphire, Blue Sapphire

Emilio Jewelry GIA Certified Fancy Intense Pure Green Diamond Ring
By Emilio!
Located in New York, NY
Avenue, Gia certified natural fancy intense green diamond center with no overstone 1.60+ carats mouting
Category

21st Century and Contemporary Three-Stone Rings

Materials

Diamond, Blue Diamond

3.65 Carat Intense Blue Pear Cut Natural Sapphire Diamond 14K White Gold Ring
Located in Great Neck, NY
3.65 Carat Intense Blue Pear Shape Cut Natural Sapphire Diamond 14K White Gold Ring 3.65 Carats
Category

2010s American Modern Wedding Rings

Materials

Diamond, Sapphire, White Gold

2 Carats Pear Shape Diamond Engagement Ring GIA Certified Fancy Intense Blue VS1
Located in New York, NY
GIA CERTIFIED Center Diamond: Carat Weight: 1.35 Carats Color : Fancy Intense Blue Clarity: VS1
Category

2010s American Engagement Rings

Materials

Diamond, 18k Gold, White Gold

Emilio Jewelry GIA Certified Fancy Intense Pure Green Diamond Ring
By Emilio!
Located in New York, NY
rarest of fancy colored diamonds. A magnificent 3.00 Carat Fancy Intense Green diamond sits in the center
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

Intense Blue Pear Shape Sapphire & Diamond Pendant on 14k White Gold Snake Chain
Located in Palm Beach, FL
A traditional design with a modern update. The .58ct round brilliant cut diamond set in a 4 prong
Category

21st Century and Contemporary Unknown Modern Pendant Necklaces

Materials

Diamond, Sapphire, 14k Gold, White Gold

18k White Gold Sapphire Lanterns 6.74 Carat Intense Blue Sapphire Dangle Earring
By Malpani Jewels
Located in Hung Hom, HK
spiral of 16 white diamonds. Blue Sapphires are highly sought after gems today. Their stunning array of
Category

2010s Hong Kong Aesthetic Movement Dangle Earrings

Materials

Diamond, White Diamond, Blue Sapphire, White Gold

Intense Gray Crystal Opal Diamond Gold Ring
Located in Miami Beach, FL
green, blue and orangish red play of color mounted in an 18k gold mounting full of baguette, marquise
Category

Mid-20th Century Unknown Cocktail Rings

Materials

Diamond, Opal, 18k Gold, Gold

Emilio Jewelry GIA Certified 6.00 Carat Fancy Intense Green Diamond Ring
By Emilio!
Located in New York, NY
very special and rare Gia certified natural 6 carat fancy intense green diamond center ring. We are
Category

21st Century and Contemporary Three-Stone Rings

Materials

Diamond, Blue Diamond

Emilio Jewelry GIA Certified 1.00 Carat Fancy Intense Green Diamond Ring
By Emilio!
Located in New York, NY
fancy intense yellowish green diamond center. With Emilio's expertise after setting the center faces up
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

Emilio Jewelry GIA Certified 3.00 Carat Fancy Intense Yellowish Green Diamond
By Emilio!
Located in New York, NY
fancy intense yellowish green diamond. Yellowish means the overtone is very slight and 90% green. We
Category

21st Century and Contemporary Three-Stone Rings

Materials

Pink Diamond, Blue Diamond

Intense Blue Round Sri Lankan Sapphire cts 1. 82 Engagement Ring
Located in Hong Kong, HK
forever. The color itself is a deep intense pleasant blue. Set with 2 diamond trillions of cts 0.29 in E
Category

21st Century and Contemporary Hong Kong Contemporary Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, 18k Gold, White Gold

13.42 Carat Intense Blue Cushion Cut Natural Sapphire 14K White Gold Ring
Located in Great Neck, NY
13.42 Carat Intense Blue Cushion Cut Natural Sapphire Diamond 14K White Gold Ring 5.95 grams, size
Category

2010s North American Bridal Rings

Materials

Diamond, Sapphire, Blue Sapphire, 14k Gold, White Gold

13.42 Carat Intense Blue Cushion Cut Natural Sapphire 14K White Gold Ring
Located in Great Neck, NY
13.42 Carat Intense Blue Cushion Cut Natural Sapphire Diamond 14K White Gold Ring 5.95 grams, size
Category

2010s North American Bridal Rings

Materials

Diamond, Blue Sapphire, Sapphire, 14k Gold, White Gold

15.68 Carat Cushion Cut Ceylon Intense Blue Sapphire Three-Stone Engagement Ring
By Roman Malakov
Located in New York, NY
sapphire gemstone certified by C. Dunaigre as intense blue color, Ceylon/ Sri Lanka origin. Flanking the
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Blue Sapphire, Platinum

Burma No Heat 3.32 Carat Intense Blue Sapphire AGL Cert Platinum Engagement Ring
Located in Birmingham, MI
A rare and highly transparent No Heat Burma (Myanmar) intense blue sapphire weighing 3.32 carats
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

Emilio Jewelry Gia Certified 2.73 Carat Fancy Intense Blush Green Diamond Ring
By Emilio!
Located in New York, NY
Intense Bluish Green diamond set in the center. Please inquire for more images, certificates, details
Category

21st Century and Contemporary Three-Stone Rings

Materials

Blue Diamond

Emilio Jewelry GIA Certified 2.00 Carat Fancy Intense Green Heart Diamond Ring
By Emilio!
Located in New York, NY
natural fancy intense yellow green heart shape center. There are an additional 3.90 carats of white
Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Blue Diamond, Pink Diamond

Tiffany & Co. Soleste Fancy Intense Yellow Halo Diamond Engagement Ring
By Tiffany & Co.
Located in Rome, IT
stunning 1.78 ct Fancy Intense Yellow Cushion Brilliant Cut Diamond. Set in a luxurious halo of platinum
Category

2010s Unknown Solitaire Rings

Materials

Diamond, Yellow Diamond, Platinum

2.32 Carats Intense Pink Diamond Cluster Stud Earring 18K
By Malpani Jewels
Located in Hung Hom, HK
other colored diamonds, such as blue diamonds, yellow diamonds, and red diamonds. Natural pink diamond
Category

2010s Hong Kong Art Nouveau Chandelier Earrings

Materials

Pink Diamond, 18k Gold

David Rosenberg 5.02 Carat Cushion Fancy Intense Green Yellow GIA Diamond Ring
By David Rosenberg
Located in Boca Raton, FL
Rosenberg Diamonds & Co. 5.02 carat Cushion Fancy Intense Green Yellow SI1 clarity accompanied by a
Category

21st Century and Contemporary North American Modern Dome Rings

Materials

Blue Diamond, Diamond, White Diamond, Yellow Diamond, Pink Diamond, 18k ...

Emilio Jewelry GIA Certified 16.00 Carat Fancy Intense Yellow Diamond
By Emilio!
Located in New York, NY
fancy intense yellow diamond. We are experts at creating jewels for these very special collectible
Category

21st Century and Contemporary Three-Stone Rings

Materials

Yellow Diamond

Vivid Diamonds AGL Certified 5.91 Carat Burma No Heat Sapphire & Diamond Ring
By Vivid Diamonds
Located in Miami, FL
celebrated for their intense "royal" or "midnight" blue hues. Their allure lies not just in their color but
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Sapphire, 18k Gold, White Gold

GIA Certified Diamond Studs 6.00 Carat VVS, Fancy Intense Yellow, Cushion Cut
Located in Darmstadt, DE
GIA Certified Diamond Studs 6.00 Carat VVS, Fancy Intense Yellow, Cushion Cut Perfect Yellow Color
Category

2010s German Modern Stud Earrings

Materials

Diamond

GIA Certified Diamond Studs 4.00 Carat VVS, Fancy Intense Yellow, Cushion Cut
Located in Darmstadt, DE
GIA Certified Diamond Studs 4.00 Carat VVS, Fancy Intense Yellow, Cushion Cut Perfect Yellow Color
Category

2010s German Modern Stud Earrings

Materials

Diamond

Bespoke Halo Mount for 3-5 Carat Yellow White Diamond Oval Shape Platinum Ring
By Hasbani Diamonds
Located in London, GB
features 0.13 Carat Round Diamond Fancy Intense Yellow giving this Double Halo Diamond Engagement Ring an
Category

2010s British Modern Engagement Rings

Materials

Amethyst, Aquamarine, Citrine, Diamond, White Diamond, Pink Diamond, Eme...

GIA Certified Diamond Studs 2.00 Carat VS, Fancy Intense Yellow, Cushion Cut
Located in Darmstadt, DE
GIA Certified Diamond Studs 2.00 Carat VS, Fancy Intense Yellow, Cushion Cut Perfect Yellow Color
Category

2010s German Modern Stud Earrings

Materials

Diamond

  • 1
  • ...
Get Updated with New Arrivals
Save "Intense Blue Diamond", and we’ll notify you when there are new listings in this category.

Intense Blue Diamond For Sale on 1stDibs

Find the exact intense blue diamond you’re shopping for in the variety available on 1stDibs. Every item for sale was constructed with extraordinary care, often using Gold, 18k Gold and White Gold. Our collection of these items for sale includes 10 vintage editions and 40 modern creations to choose from as well. Making the right choice when shopping for an intense blue diamond may mean carefully reviewing examples of this item dating from different eras — you can find an early iteration of this piece from the 20th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. For this particular accessory, there are many different carat weights to choose from, but .5 Carat and 1 Carat versions are of considerable interest. Finding an appealing intense blue diamond — no matter the origin — is easy, but Emilio!, Héritage Jewelry and Antinori Fine Jewels each produced a popular version that is worth a look. See these pages for an oval cut iteration of this accessory, while there are also cushion cut cut and round cut cut versions available here, too. There aren’t many items for men if you’re seeking an intense blue diamond, as most of the options available are for women and unisex.

How Much is a Intense Blue Diamond?

On average, an intense blue diamond at 1stDibs sells for $15,205, while they’re typically $678 on the low end and $4,695,000 for the highest priced versions of this item.
Questions About Intense Blue Diamond
  • 1stDibs ExpertAugust 17, 2021
    Yes, a blue diamond is a real diamond. Contrary to popular belief, diamonds come in an array of colors aside from clear. Blue diamonds are neither color-treated nor enhanced to deliver the icy shade, which can range from a seafoam green to a royal blue.
  • 1stDibs ExpertFebruary 22, 2021
    A light blue 0.5 carat diamond is worth roughly $26,280 on average. A deep blue 0.25 diamond, costs $75,000 on average. Blue diamonds are the rarest color of diamond, only found in three areas of the world: Australia, South Africa, and India. The deeper the blue diamonds are even more rare and therefore more expensive.
  • 1stDibs ExpertApril 5, 2022
    Yes, there are blue-green diamonds. However, natural ones are very rare, so most are man-made. The Dresden Green is the most famous example of a genuine blue-green diamond gemstone. You can find a wide selection of diamond gemstone jewelry on 1stDibs.
  • 1stDibs ExpertApril 22, 2024
    Yes, Blue Nile diamonds are legit. The jewelry maker offers both natural diamonds sourced from mines and lab-created diamonds produced via controlled scientific techniques. Both types of diamonds are legitimate or genuine gemstones. Find a range of Blue Nile diamond jewelry on 1stDibs.
  • 1stDibs ExpertOctober 5, 2021
    The price of a natural blue diamond is determined first by the color and then its clarity. Depending on these factors and the size chosen, there is a huge variation in price. You will find the blue diamond price range from under $2,000 to over $10,000 on 1stDibs.
  • 1stDibs ExpertOctober 5, 2021
    A blue diamond ring worth depends on the type of blue diamond. Ideally, a blue diamond’s cost is based on its 4Cs (cut, color, clarity, and carat), with the intensity of the color being the dominant factor. A blue diamond ring price ranges between $6,800 to $11,200. On 1stDibs, you can find a range of exquisite antique and vintage blue diamond rings.