1.61 ct Natural Heated Blue Sapphire – Round Cut | GIA Certified | Sri Lanka (Ceylon)

A natural 1.61 carat blue sapphire in a round shape, from Sri Lanka (Ceylon), heat treated, GIA Report #2241017779. This stone is cut with a brilliant-faceted crown over a step-cut pavilion — a modified round brilliant construction that combines strong face-up sparkle with the color depth step facets bring to the body of the stone. Ceylon blue is the benchmark color profile for the variety. At 1.61 carats, this sits solidly in the center stone range for engagement rings and pendants.

Rarity Analysis

A few factors combine to set this particular stone apart within the round Ceylon blue sapphire category:

• Color: Ceylon blue is the color benchmark buyers reference when they picture "blue sapphire" — this stone carries a vivid saturation of that hue.
• Size: At 1.61 carats it sits in the strong center-stone range for round sapphires, large enough to read clearly at wearing distance without moving into rarer, steeply-priced multi-carat territory.
• Treatment: Heat treated, a standard and widely accepted enhancement for sapphire, disclosed directly on the GIA report rather than left for the buyer to guess at.
• Cut: The modified round brilliant construction — brilliant crown, step-cut pavilion — is a deliberate cutting choice used to hold color and weight together in fine rough, rather than a compromise cut.
• Documentation: GIA Report #2241017779 independently confirms weight, dimensions, cut, treatment, and the Sri Lanka origin.
• Combined effect: A Ceylon-origin, GIA-documented round blue sapphire at a solid center-stone weight is the combination most buyers are actually searching for when they shop for a blue sapphire, which keeps demand — and resale liquidity — for stones like this one comparatively strong.

Buying Guidance

A few practical points to weigh before purchasing this specific stone:

• View it in natural or daylight-balanced light. Ceylon blue can shift subtly under warm incandescent lighting versus daylight, so judge the saturation under both if possible.
• Confirm your setting can accommodate the dimensions. At 6.92–7.09 x 4.47 mm, this round stone will need a setting sized to those exact measurements, not a generic "1.5 ct round" estimate.
• When comparison shopping, check that the treatment is disclosed on a lab report rather than just stated in a listing — heat treatment should be confirmed by the certifying lab, not assumed.
• Weigh availability against the Rarity Analysis above. GIA-documented Ceylon round blues in this size and saturation move steadily, so pieces with full documentation like this one don't tend to stay listed indefinitely.
• Use the Try Before You Buy option if you would like to see the stone in hand before finalizing the purchase.

Learn More About This Gemstone

• Blue Sapphire Buyer's Guide
• Is a Round Sapphire Good for an Engagement Ring?
• Unheated Sapphire Guide
• GIA Guide
• Custom Ring Guide
• Sapphire Buying Guide

Why Choose this 1.61 ct Round Ceylon Blue Sapphire?

Round is the format most buyers default to when specifying a blue sapphire engagement ring, and Ceylon blue is the origin that produces the most consistently vivid blue at the commercial level. This particular stone's modified round brilliant cut — brilliant crown, step-cut pavilion — is a construction cutters use to preserve carat weight and color saturation in fine rough. GIA Report #2241017779 confirms the cut, weight, dimensions, and heat treatment. At 1.61 carats, this stone has enough face-up surface to display the blue clearly at wearing distance in any setting.

Key Benefits of this Natural Blue Sapphire

• Ceylon Origin
  Sri Lanka — GIA Report #2241017779 confirms the geographic origin.
• Modified Round Brilliant Cut
  Brilliant crown facets deliver face-up sparkle; the step-cut pavilion adds color depth.
• Strong Center Stone Size
  1.61 carats in a round — visible and impactful in any engagement or pendant setting.
• Designer-Ready Format
  Round is the most common engagement ring setting format, usable without custom fabrication.
• Durable for Daily Wear
  Corundum at Mohs 9, second only to diamond.

Features

• Carat Weight: 1.61 Carats
• Gem Type: Natural Blue Sapphire
• Shape: Round
• Cut Style: Modified Round Brilliant (brilliant crown, step-cut pavilion)
• Origin: Sri Lanka (Ceylon)
• Treatment: Heat Treated
• Color: Blue
• Transparency: Transparent
• Clarity: Slightly Included — minor inclusions, eye-clean at typical viewing distance
• Certification: GIA Report #2241017779
• Hardness: 9 on the Mohs scale

This 1.61 ct round Ceylon blue sapphire has been hand-selected for the vividness of its blue and the brilliance its faceted crown delivers — the combination that most buyers mean when they say they want a blue sapphire.

Why Customers Love This Gemstone

• Ceylon Origin: The source that defines what fine blue sapphire looks like.
• Modified Round Brilliant: Brilliant crown facets for sparkle, step-cut pavilion for color depth.
• Standard Format: Fits the most common engagement setting without custom work.
• Trusted Source: Treatment disclosed honestly, GIA Report #2241017779 confirms origin and quality.

Owning this 1.61 ct round Ceylon blue sapphire means choosing the combination — origin, cut, and size — that most consistently delivers what buyers want from a blue sapphire center stone, backed by GIA Report #2241017779.

Perfect Uses for this 1.61 ct Blue Sapphire

• Engagement ring center stone
• Custom pendant solitaire
• Halo ring center stone
• September birthstone gift
• Anniversary gift at the fine jewelry level