1.73 ct Natural Unheated White Sapphire – Radiant Cut

A natural 1.73 carat white sapphire in a radiant cut, colorless and untreated. White sapphire is natural corundum that formed without the trace elements that produce color — the same mineral species as blue, yellow, or pink sapphire but entirely without chromophores. The radiant cut at 1.73 carats produces a stone with strong face-up presence and a modern rectangular silhouette — a format that delivers both architectural clarity and brilliant light return in colorless material.

Rarity Analysis

Colorless corundum forms without the trace elements that create sapphire's typical colors, and untreated colorless material is a small fraction of overall white sapphire supply.

• Color: Fully colorless corundum is inherently uncommon — most rough with color potential is directed toward colored-sapphire production, and much commercial white sapphire has been heat treated to lighten residual tint.
• Size: Untreated white sapphire above 1.5 carats with good transparency is less commonly available than smaller sizes, where near-colorless rough is easier to source.
• Treatment: This stone is untreated — no heat, coating, or fracture filling — which sets it apart from the majority of white sapphire on the market that has undergone heat treatment.
• Clarity: Graded eye-clean, with no inclusions visible under normal viewing — important for a stone whose whole appeal rests on transparency and light return.
• Documentation: AGCL Gem Lab certification confirms the untreated status and natural origin — an important verification point for a stone marketed specifically on being untreated.
• Combined effect: The combination of full colorlessness, untreated status, eye-clean clarity, and above-1.5-carat weight is uncommon enough that this stone is not easily replaced with an equivalent.

Buying Guidance

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

• View it under bright, direct light. Radiant cuts perform best under strong lighting, so assess brilliance in conditions similar to where you'll wear it.
• Consider the setting for an elongated silhouette. At 8.42 x 5.27 mm, this radiant suits an east-west or classic four-prong solitaire setting; confirm your setting accommodates the rectangular outline.
• Confirm treatment status directly when comparison shopping. Untreated stones are the minority of white sapphire on the market, and the term "natural" alone does not guarantee untreated — ask for documentation.
• Weigh availability at this size and treatment status. Untreated colorless sapphire at this size and clarity is a narrower slice of the market than heat-treated white sapphire, which affects both price and availability, as described above.
• 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

• White Sapphire Buyer's Guide
• Unheated Sapphire Guide
• GIA Guide
• Custom Ring Guide
• Sapphire vs. Moissanite vs. Lab Diamond
• Sapphire Buying Guide

Why Choose this 1.73 ct Radiant White Sapphire?

At 1.73 carats in a radiant cut, this white sapphire has the size and the format for confident engagement ring and pendant center stone use. The radiant cut produces more light return than step cuts and more architectural presence than round brilliants — the middle ground between sparkle and structure that suits contemporary jewelry design. Untreated status means the colorlessness is entirely natural, with no heat treatment applied at any stage.

Key Benefits of this Natural White Sapphire

• Untreated Natural Colorlessness
  No heat treatment, no coating, no filling — natural colorless corundum exactly as found.
• Mohs 9 Hardness
  The hardest colorless gemstone other than diamond — appropriate for daily ring wear without special care.
• Radiant Cut Versatility
  Architectural rectangular outline with brilliant faceting — more structured than round, more sparkle than step cuts.
• Strong 1.7-Carat Size
  Above 1.5 carats — visible and impactful in any engagement or pendant setting.
• Natural Diamond Alternative
  Colorless, hard, durable — at a fraction of the diamond price.

Features

• Carat Weight: 1.73 Carats
• Gem Type: Natural White Sapphire
• Cut: Radiant
• Treatment: Untreated
• Color: Colorless
• Clarity: Eye-clean — no visible inclusions under normal viewing
• Hardness: 9 on the Mohs scale

This 1.73 ct radiant white sapphire has been hand-selected for colorlessness and eye-clean clarity — the qualities that allow it to perform as an effective diamond alternative in any setting.

Why Customers Love This Gemstone

• Hardest Colorless Alternative: Mohs 9 — only diamond exceeds it in hardness for daily wear.
• Untreated Colorlessness: Natural — no coating or enhancement of any kind.
• Radiant Format: More architectural presence than round, more brilliance than step cuts.
• Trusted Source: Untreated status disclosed honestly, stone selected for colorlessness.

Owning this 1.73 ct radiant white sapphire means choosing the most durable colorless diamond alternative in the format that balances sparkle and structure.

Perfect Uses for this 1.73 ct White Sapphire

• Engagement ring center stone — diamond alternative
• Pendant solitaire in white gold or platinum
• Contemporary or minimalist ring design
• East-west bezel setting
• September birthstone gift