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Corn Blue Sapphire

Natural No Heat Round Vivid Corn Flower Blue Sapphire Diamond Ring
Located in New York, NY
cornflower blue color. This important sapphire is set in a custom diamond mounting featuring half moon cut
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Sapphire, 18k Gold

18 Karat Yellow Gold Engagement Ring with Four Carats Corn Flower Blue Sapphire
By Polya Medvedeva Jewellery
Located in Berlin, DE
vivid corn flower blue sapphire, 4,03 carats, 9,67x7,45 mm, AIG certified, and small round emerald. The
Category

21st Century and Contemporary German Contemporary Engagement Rings

Materials

Blue Sapphire, Sapphire, Emerald, Beryl, Yellow Gold, Rose Gold, 18k Gol...

Natural Sri Lanka corn flower blue sapphires pair 3 carats
Located in Lagos, NG
Ñatural Sri Lanka corn flower blue sapphires pair for your earrings not treated not heated
Category

21st Century and Contemporary Romantic Sculptures

Materials

Bluestone

Yellow Gold Ring with Four Carats Corn Flower Sapphire and Diamond
By Polya Medvedeva Jewellery
Located in Berlin, DE
vivid corn flower blue sapphire (more light and vivid than on the video), 4,67 carats, French
Category

21st Century and Contemporary German Contemporary Engagement Rings

Materials

Blue Sapphire, Sapphire, White Diamond, Diamond, Yellow Gold, Rose Gold,...

Diana M. Sapphire Drop Earrings 8.46ct Corn Flower Blue Set With 1.10cts Of Halo
By Diana M. Jewels
Located in New York, NY
14KT Sapphire Drop Earrings, featuring a magnificent 8.46 carat cushion-cut sapphire corn flower
Category

21st Century and Contemporary American Modern Drop Earrings

Materials

14k Gold

Linde Lindy Corn Flower Blue Star 14K Gold Ring
Located in Dallas, TX
Linde Lindy Corn Flower Blue Star 14K Gold Ring - Solitare blue sapphire set in 14K white gold with
Category

21st Century and Contemporary Dome Rings

Materials

14k Gold

18K Gold Floral Engagement Ring with Four Carats FGL Certified Blue Sapphire
By Polya Medvedeva Jewellery
Located in Berlin, DE
natural oval mixed cut vivid corn flower blue sapphire, 4,67 carats, French Gemological Laboratory
Category

21st Century and Contemporary German Artist Engagement Rings

Materials

Indicolite, Blue Zircon, Purple Sapphire, Zircon, Tourmaline, Tanzanite,...

GGTL Certified Blue and Pink Sapphire Yellow Gold Contemporary Ring
By Polya Medvedeva Jewellery
Located in Berlin, DE
natural unheated untreated vivid corn flower blue sapphire, GGTL certified, 9,3x7,2x5,89 mm. Pear cut
Category

21st Century and Contemporary German Contemporary Cocktail Rings

Materials

Tanzanite, Spinel, Pink Sapphire, Blue Sapphire, Sapphire, Ruby, Yellow ...

Vintage Sapphire and Diamond Cluster Ring
Located in London, GB
face. This principal stone boasts a vibrant corn-flower blue colour tone which is accentuated by a
Category

20th Century Cluster Rings

Materials

Diamond, Sapphire, 18k Gold, Yellow Gold

Vintage Diamond and Sapphire Filigree Platinum Earrings 46MM
Located in Chicago, IL
natural Sapphires. Sapphires exhibit saturated "CORN FLOWER" blue color and measuring approximately
Category

Vintage 1960s South American Art Deco Dangle Earrings

Materials

Diamond, Sapphire, Platinum

Vintage Diamond and Sapphire Filigree Platinum Earrings 46MM
Vintage Diamond and Sapphire Filigree Platinum Earrings 46MM
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W 0.79 in D 0.48 in L 1.82 in
59.15 Carat Ceylon Sapphire and White Diamond Necklace
By Vivid Diamonds
Located in Miami, FL
placed beautifully around the blue corn flower sapphires, capturing the unparalleled beauty of nature
Category

21st Century and Contemporary Unknown Modern Drop Necklaces

Materials

White Diamond, Sapphire, 18k Gold, White Gold

Large Natural No Heat Sapphire Diamond Platinum Cocktail Ring
Located in Napoli, IT
– diamonds TCW Gems: 1 certified oval faceted cut unheated blue Ceylon sapphire of 7.46 Ct (13.93 mm. x 11.08
Category

Vintage 1960s European Contemporary Cocktail Rings

Materials

Diamond, Sapphire, Platinum

90MM Long Sapphire and Diamond Chandelier Earrings 18K 51 gram
Located in Chicago, IL
natural blue sapphires (beautiful and saturated "corn flower" blue color) and 54 round cut natural pink
Category

2010s Unknown Modern Chandelier Earrings

Materials

White Diamond, Diamond, Sapphire, 18k Gold

90MM Long Sapphire and Diamond Chandelier Earrings 18K 51 gram
90MM Long Sapphire and Diamond Chandelier Earrings 18K 51 gram
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W 2.37 in D 0.48 in L 3.55 in
1960s Sri Lanka GIA No Heat Sapphire 15.86cts Diamond Drop Earrings
Located in Miami, FL
Platinum. GIA Certified Blue Modified Brilliant step Cushion Cut Extra Clean Sri Lankan Corn Flower
Category

Vintage 1960s American Retro Drop Earrings

Materials

Diamond, Sapphire, Platinum

Mid-Century 1.80 Ct Natural Ceylon Sapphire 1.90 Ct Diamond 18 Kt Ring
Located in Napoli, IT
gorgeous glowing corn flower hue Blue natural no heat Ceylon origin, oval faceted cut weighted for 1.82 Ct
Category

Mid-20th Century European Contemporary Cluster Rings

Materials

Diamond, Sapphire, 18k Gold

Cornflower 2 Carat Oval Sapphire and Diamond Solitaire Ring
Located in Laguna Hills, CA
2 carat approximate weight of the sapphire is natural and of a corn-flower hue coloring. This
Category

21st Century and Contemporary Unknown Contemporary Solitaire Rings

Materials

Diamond, Sapphire, 14k Gold, White Gold

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Kashmir sapphire and diamond coronet cluster, circa 1890
Located in London, GB
Kashmir sapphire and diamond coronet cluster ring. Set to center with an oval old cut natural unenhanced Kashmir sapphire in an open back claw setting with a weight of 1.48 carats, s...
Category

Antique 1890s Cluster Rings

Materials

Diamond, Sapphire, Gold, Yellow Gold

Cartier Panthère Medium Model Steel & Rose Gold Watch W2PN0007
By Cartier
Located in Banbury, GB
SKU AT-1818 Brand Cartier Model No. W2PN0007 Retail Price £8,750 incl. VAT / $9,100 / €9 850 incl. VAT ____________________________________ Date Circa 2000 Gender Unisex / Women Box/...
Category

Early 2000s French Wrist Watches

Materials

Blue Sapphire, Stainless Steel, Steel, Rose Gold

Cartier Panthère Medium Model Steel & Rose Gold Watch W2PN0007
Cartier Panthère Medium Model Steel & Rose Gold Watch W2PN0007
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H 1.46 in W 1.15 in Dm 0.24 in
Cartier Tri Colour Cartier Trinity Ring
By Cartier
Located in Toronto, Ontario
The famous Cartier Trinity ring. Featuring three intersecting 18K white, yellow, and rose gold band rings. High polished finish with a vintage patina. Fully signed interior with Cart...
Category

Late 20th Century French Band Rings

Materials

18k Gold

Alexander GIA 3.09 Carat Emerald Cut Diamond Solitaire Ring 18k Yellow Gold
By Alexander Beverly Hills
Located in BEVERLY HILLS, CA
Stunning modern bezel set diamond solitaire ring yellow gold. High Jewelry by Alexander Beverly Hills. GIA graded 3.09 carat emerald cut diamond, J color grade, and VS1 clarity grade...
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, 18k Gold, Yellow Gold

Alexander GIA 7.11 Carat Sapphire with Diamonds Three-Stone Ring 18 Karat Gold
By Alexander Beverly Hills
Located in BEVERLY HILLS, CA
Exquisite sapphire and diamond three stone ring. High jewelry by Alexander Beverly Hills. 7.11 carat cushion sapphire, GIA certified heat. Complimented with a pair of trilliant diamo...
Category

21st Century and Contemporary American Modern Three-Stone Rings

Materials

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

Yellow Gold Peacock Pinky Ring with Two Carats Sapphire and Emerald
By Polya Medvedeva Jewellery
Located in Berlin, DE
This contemporary Peacock ring is in 18 karat yellow gold with natural cushion cut blue sapphire, 2,55 carats, 0,35x0,3 inches / 9x7,8 mm, and round emerald. The ring is easy to wear...
Category

21st Century and Contemporary German Contemporary Cocktail Rings

Materials

Blue Sapphire, Sapphire, Emerald, Beryl, Yellow Gold, Rose Gold, 18k Gol...

Estate 6 Carat Sapphire and Diamond Engagement Ring
Located in Santa Barbara, CA
This glamorous sapphire and diamond 3 stone ring is an absolute beauty. The rich blue sapphire has an intense and vivid color that is hugged by 2 glimmering, uniquely cut half moon d...
Category

1990s Retro Engagement Rings

Materials

Blue Sapphire, Diamond, Sapphire, Platinum

David Rosenberg 7.04 Carat Pear Shape Platinum GIA Diamond Engagement Ring
By David Rosenberg
Located in Boca Raton, FL
Rosenberg Diamonds & Co. 7.04 carat Pear shape H color SI1 clarity is accompanied by a GIA certificate. This Exceptional SI1 Pear shape is full of brilliance and it is set in a handm...
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Platinum

Eighteen Karat Yellow Gold Peacock Ring with Four Carats Sapphire and Diamond
By Polya Medvedeva Jewellery
Located in Berlin, DE
This contemporary Peacock ring features a cushion-cut blue sapphire weighing 4.17 carats and diamond accents, set in 18 karat yellow gold. The ring is comfortable to wear, and the ge...
Category

21st Century and Contemporary German Contemporary Fashion Rings

Materials

Diamond, White Diamond, Sapphire, Blue Sapphire, Gold, 18k Gold, Rose Go...

J. Birnbach GIA Certified 9.23 Carat F VVS1 Emerald Cut with Tapered Baguettes
By J. Birnbach
Located in New York, NY
This ring fit for royalty is fresh from the J. Birnbach workshop! Featuring a GIA certified 9.23 carat emerald cut diamond of F color and VVS1 clarity, this center stone is thoughtfu...
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Platinum

Royal Blue Kashmir Sapphire and Diamond Ring, circa 1920
Located in London, GB
Royal Blue Kashmir sapphire and diamond ring. Set to centre with a single cushion shape old cut natural unenhanced Royal Blue Kashmir sapphire in an open back claw setting with an ap...
Category

Vintage 1920s Unknown Engagement Rings

Materials

Diamond, Blue Sapphire, Platinum

GIA Certified 2.30 Carats Total Emerald Cut Diamond Solitaire Engagement Ring
By Roman Malakov
Located in New York, NY
A classic solitaire engagement ring showcasing a 2.30 carat emerald cut diamond certified by GIA as M color, VVS2 clarity. Diamond is set on a polished 18k yellow gold mounting. Size...
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, 18k Gold, Yellow Gold

Art Deco 4.03 carats Colombian Emerald Ring Minor Oil Type AGL Certificate
Located in Milano, IT
Beautiful 4,03 ct Colombia Minor Oil Emerald, settled in a platinum and diamonds art deco ring. The color of this Emerald is top scale. Certificate AGL Stating the 4,03cts emerald to...
Category

Early 20th Century Italian Art Deco Engagement Rings

Materials

Diamond, Emerald, Platinum

Van Cleef & Arpels No Enhancement Burmese 12.01 carat Sapphire Diamond Ring
By Van Cleef & Arpels
Located in New York, NY
Van Cleef and Arpels Burmese sapphire and diamond ring. Set with natural no enhancement oval old cut Burmese 12.01 carat sapphire, surrounded by 14 fine quality brilliant shape dia...
Category

Vintage 1980s French Artist Engagement Rings

Materials

Diamond, Sapphire, 18k Gold

Art Nouveau GIA No Heat Sapphire Snake Ring 1ct Cushion Cut Original 1890's 18K
Located in Dearborn, MI
Discover the Allure of the 1890's with our Art Nouveau GIA No Heat Sapphire Snake Ring. This 1ct Cushion Cut Gem Set in 18K Gold Delivers Elegance and History in One Stunning Piece ...
Category

Antique 1890s Art Nouveau Cocktail Rings

Materials

Diamond, Sapphire, 18k Gold, Yellow Gold

Tiffany & Co. 1.58 Carat Round Brilliant Cut Diamond Solitaire Engagement Ring
By Tiffany & Co.
Located in Rome, IT
Tiffany & Co. 1.58 Carat Round Brilliant Cut Diamond Solitaire Engagement Ring. The ring is comes with Original Tiffany & Co. Diamond Certificate
Category

2010s American Modern Engagement Rings

Materials

Diamond, White Diamond, Platinum

Recent Sales

Certified 2.55 Carat No Heat Blue Sapphire Diamond 18 Karat Gold Ring
By Brij Nivesh
Located in Hollywood, FL
carats (7.69 x 7.18 x 5.18 mm ) Color: Corn Flower Blue Clarity: Transparent Accompanied by certificate
Category

21st Century and Contemporary Indian Contemporary Cocktail Rings

Materials

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

Cartier 3.10 Carat Sapphire Diamond Ring
By Cartier
Located in Chestnut Hill, MA
18 karat yellow gold sapphire and diamond ring consisting of one oval corn flower blue sapphire
Category

Late 20th Century Fashion Rings

Materials

Diamond, Blue Sapphire, 18k Gold

Large Natural No Heat Sapphire Diamond Platinum Cocktail Ring
Located in Napoli, IT
heat Sapphire Ceylon origin - fully certified by GCS London. Stunning corn flower hue, large size of
Category

Vintage 1960s Italian Contemporary Cocktail Rings

Materials

Diamond, Sapphire, Platinum

Magnificent 5.36 Carat Unheated Ceylon Sapphire .70 Carat Diamond Platinum Ring
Located in Napoli, IT
Sapphire of vibrant and vivacious, gorgeous, intense Corn Flower Blue hue colour, which made sought after
Category

Vintage 1980s Contemporary Engagement Rings

Materials

Diamond, Sapphire, Platinum

Vintage 3.0 Carat Untreated Sapphire .80 Carat Diamond Bumble Bee Brooch
Located in Napoli, IT
enhanced with tons of Natural Sapphires of stunning Corn Flower colour hue. 3.0 Ct approx in total giving
Category

Vintage 1950s Contemporary Brooches

Materials

Diamond, Sapphire, 18k Gold

Chrysocolla Doublet Geometrical Unisex Gold Rhodium Plated Silver Cocktail Ring
Located in London, GB
Strongly geometrical unisex ring with chrysocolla/rock crystal doublet and corn blue sapphires at
Category

21st Century and Contemporary British Contemporary Cocktail Rings

Materials

18k Gold, Rhodium, Sterling Silver

GIA Certified 18.07 Sri Lanka Origin Carat Emerald Cut Blue Sapphire
Located in Los Angeles, CA
Origin. This stone is heat treated. This sapphire is a true corn flower blue, and color depends on
Category

21st Century and Contemporary Sri Lankan Art Deco More Jewelry

Materials

Blue Sapphire

3.14 Carat Cornflower Blue Sapphire, No Heat & Diamond, Certified, Band Ring
By Minka Jewels
Located in London, GB
, Sri Lankan, cornflower blue Sapphire with Lotus certificate. This exceptional no heat, corn flower
Category

2010s British Contemporary Cocktail Rings

Materials

Sapphire, White Diamond, Blue Sapphire, 18k Gold

Spark Creations Sapphire and Diamond Set Gold Earrings
By Spark Creations
Located in Litchfield, CT
stones are all hallmarks of Spark Creations jewelry. The 1.50 carats of gorgeous corn flower blue
Category

Early 2000s American Lever-Back Earrings

Materials

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

Sri Lankan Sapphire and White Diamond 3-Stone Cocktail Ring
By Minka Jewels
Located in London, GB
Made to order: A sophisticated and elegant cocktail ring a beautiful and vibrant corn flower blue
Category

2010s British Contemporary Cocktail Rings

Materials

White Diamond, Blue Sapphire, 18k Gold

Modern 2, 71 Certified Cornflower Sapphire Diamonds 18 Karat White Gold Ring
Located in Poitiers, FR
carats approximately. Certified "Corn Flower Blue" sapphire - "Bleuet" hue. Total weight of the diamonds
Category

21st Century and Contemporary French Modern Engagement Rings

Materials

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

Ceylon Sapphire and 18k Yellow Gold Ring
Located in New Orleans, LA
Beautiful 4.50 Carat corn-flower blue oval cut sapphire set in platinum and 18K yellow gold. The
Category

Early 20th Century Unknown Art Deco Cocktail Rings

Materials

Sapphire, Yellow Gold, Platinum

3.85Ct Sapphire & 0.62Ct Diamond, 15k Yellow Gold Pendant - Antique Circa 1910
Located in Jesmond, Newcastle Upon Tyne
cut diamonds. The feature oval cut natural blue sapphire is held in subtle relief within a
Category

Vintage 1910s Unknown Drop Necklaces

Materials

Diamond, Sapphire, 15k Gold, Yellow Gold

15k Gold Victorian Seed Pearl & Sapphire Band Ring W/ British Hallmark Date 1893
Located in Addison, TX
up to two half cut seed pearls on either side of a corn flower blue cushion cut sapphire. This low
Category

Antique 1890s Unknown Victorian Band Rings

Materials

Pearl, Sapphire, 15k Gold

Sri Lankan Sapphire and White Diamond 3-Stone Ring
By Minka Jewels
Located in London, GB
A sophisticated and elegant cocktail ring a beautiful and vibrant corn flower blue, Sri Lankan
Category

2010s British Contemporary Cocktail Rings

Materials

White Diamond, Blue Sapphire, 18k Gold

Chrysocolla Doublet Geometrical Unisex Gold Cocktail Ring
Located in London, GB
Strongly geometrical unisex ring with chrysocolla/rock crystal doublet and corn blue sapphires at
Category

21st Century and Contemporary British Contemporary Cocktail Rings

Materials

Rhodium, 18k Gold, Sterling Silver

21.19ct Corn Flower Blue Sapphire and Diamond Ring
By Shreve, Crump & Low
Located in Chestnut Hill, MA
Platinum custom made solitaire ring consisting of 1 cushion cut Ceylon Cornflower blue sapphire
Category

21st Century and Contemporary Sri Lankan Contemporary Cluster Rings

Materials

Diamond, Sapphire, Platinum

GRS 6.81 Carat Oval Cornflower Natural Blue No Heated Sri Lanka Sapphire Ring
Located in Istanbul, TR
sapphire is a special color name by certificate GRS corn flower
Category

21st Century and Contemporary Sri Lankan Bridal Rings

Materials

Diamond, Blue Sapphire, 18k Gold

Art Deco Gold and Sapphire Cufflinks
Located in New York, NY
Round, engraved 14kt gold cufflinks with corn-flower blue sapphires, American circa 1930. *Not
Category

Vintage 1930s American Cufflinks

Materials

Sapphire, 14k Gold

Edwardian Certified 2.70 Carat No Heat Ceylon Sapphire Diamond Platinum Ring
Located in Napoli, IT
, vibrant Corn Flower Blue hue Natural NO HEAT Ceylon Sapphire 2.70 CT Spreads larger than that (9.3 mm. X
Category

Antique Early 1900s Edwardian Cluster Rings

Materials

Diamond, Sapphire, Platinum

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Corn Blue Sapphire For Sale on 1stDibs

You are likely to find exactly the corn blue sapphire you’re looking for on 1stDibs, as there is a broad range for sale. Frequently made of gold, 18k gold and platinum, this item was constructed with great care. You can easily find a 25 antique edition and 10 modern creations to choose from as well. If you’re looking for a corn blue sapphire from a specific time period, our collection is diverse and broad-ranging, and you’ll find at least one that dates back to the 20th Century while another version may have been produced as recently as the 21st Century. A corn blue sapphire from John Hardy, Galt & Bro. Jewelers and Michael Kneebone — each of whom created a beautiful version of this treasured accessory — is worth considering. A round cut version of this piece has appeal, but there are also old european cut and cushion cut versions for sale. When shopping for a corn blue sapphire, you’ll find that there are less available pieces for unisex or men today than there are for women.

How Much is a Corn Blue Sapphire?

Prices for a corn blue sapphire can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $960 and can go as high as $26,600, while this accessory, on average, fetches $4,895.
Questions About Corn Blue Sapphire
  • A Ceylon Sapphire is a sapphire the originated from Sri Lanka. These sapphires are popular due to their quality, range of blue shades, and overall beauty.
  • 1stDibs ExpertApril 5, 2022
    A synthetic blue sapphire is an authentic sapphire crafted in a lab using a technique known as flame fusion. The chemical makeup of a synthetic sapphire is identical to a natural sapphire. Browse 1stDibs to find a collection of synthetic sapphire jewelry from top sellers.
  • 1stDibs ExpertApril 5, 2022
    Whether or not royal blue and sapphire blue are the same color is largely a matter of personal perception and how the names are used. Generally, both colors describe a deep bright blue. You may see them used generally, but manufacturers of paints, apparel and other items that come in many hues may refer to one blue as royal and another as sapphire.
  • 1stDibs ExpertFebruary 22, 2021
    Blue sapphires are usually the most expensive sapphire. Some can cost as much as $25 per carat and others can cost over $11,000 per carat. The price is usually dependent on the stone's quality.
  • 1stDibs ExpertOctober 12, 2021
    The best cuts for a blue sapphire are said to be oval, round, and cushion. The look of an oval-cut sapphire is similar to that of a round sapphire. The slightly extended shape, on the other hand, can make it appear larger than a similar-weight stone. A round cut is one of the most traditional shapes, and it helps a gem dazzle to its full potential. The presence of about 58 facets results in a large amount of light being reflected. Cushion cut, sometimes known as the 'pillow-cut,' has been popular for generations due to its cushion-like appearance. The gemstone has a rectangular form with soft, slightly rounded corners in this cut. Typically, the crown has 58 to 64 big facets. These cuts were popular in numerous forms of jewelry, including rings, pendants, and earrings. Find a wide variety of blue sapphire jewelry on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    The term blue star sapphire means a blue corundum stone that displays a six-pointed star when viewed in the light. Blue star sapphires are usually polished cabochons rather than cut gems. On 1stDibs, find a variety of blue star sapphire gemstone jewelry.
  • 1stDibs ExpertApril 5, 2022
    A blue sapphire engagement ring is traditionally symbolic of faithfulness, wisdom and honesty. One of the most renowned blue sapphire engagement rings belonged to Princess Diana. Shop a range of authentic vintage and contemporary blue sapphire engagement rings on 1stDibs.
  • 1stDibs ExpertAugust 17, 2021
    A blue sapphire ring is worth about $8,000 depending on the carat weight and quality of the stone. Blue sapphires are the most valuable color of this particular gem, making a blue sapphire ring quite valuable. A broad range of blue sapphire rings can be found on 1stDibs.
  • 1stDibs ExpertNovember 27, 2023
    Yes, blue sapphire can be a good option for a wedding ring. Rated at 9 out of 10 on the Mohs scale, the gemstone resists scratches and cleavage, making it a durable choice for everyday wear. Blue sapphires also traditionally symbolize faithfulness and loyalty, so they can represent a lasting commitment to one's wedding vows. Shop a collection of blue sapphire wedding rings on 1stDibs.
  • 1stDibs ExpertOctober 12, 2021
    A blue star sapphire has a transparent body with a deep blue color. A blue star sapphire ring’s worth depends on the 4Cs — color, clarity, cut and carat. Prices for a blue star sapphire ring can also differ according to size and time period. These accessories begin at $449 and can cost as much as around $200,000 or more. On 1stDibs, shop a range of vintage blue star sapphire rings.