Blue Sapphire Engagement Rings

How to choose a blue sapphire engagement ring

The centre stone is what makes a blue sapphire engagement ring. Unlike diamonds, sapphires are not graded on one universal scale. Value is driven above all by colour, then by clarity, cut and carat weight. Here is what actually matters when you compare stones.

Colour is the single biggest factor

Colour accounts for most of a blue sapphire’s price. Gemmologists describe it in three parts: hue (the shade of blue, ideally pure blue with at most a hint of violet), tone (how light or dark the stone reads) and saturation (how vivid the colour is). The most sought-after stones are royal blue, a deep velvety blue, and cornflower blue, a softer lighter tone historically associated with Kashmir sapphires. Stones that are too dark look almost black in low light; stones that are too pale lose presence on the hand. A medium to medium-dark tone with strong saturation performs best in both daylight and indoor lighting.

Clarity and cut

Almost every natural sapphire contains inclusions. Fine needle-like inclusions, known as silk, are a normal sign that a stone is natural. What matters is whether inclusions are visible to the naked eye and whether they interrupt the colour. Cut is just as important: sapphires are cut to maximise colour rather than to fixed proportions, so a well-cut stone shows even colour across the whole face, with no dark centre and no washed-out window.

Carat weight and how big the stone looks

Sapphire is denser than diamond, so a 1 ct sapphire looks slightly smaller than a 1 ct diamond. When you compare sizes, compare millimetres rather than carats: a 6.5 mm round sapphire weighs roughly 1.30 ct, while a 6.5 mm round diamond weighs about 1.00 ct.

Heated and unheated sapphires

Gentle heat treatment is standard practice in the trade. It permanently improves colour and clarity and is fully accepted as long as it is disclosed. Independent laboratories such as the GIA report both colour and treatment on their sapphire certificates. Genuinely unheated sapphires are rare and carry a significant premium. We state the treatment for every stone we sell and supply an independent gemmological certificate for our larger sapphires.

Settings and metals that suit a blue sapphire

Blue sapphires contrast beautifully with white metals, but the setting you choose changes the look of a blue sapphire engagement ring more than most people expect.

• Halo – a ring of pavé diamonds around the sapphire makes the centre stone read noticeably larger and lifts a darker blue. Browse our halo engagement rings.
• Three-stone – a sapphire flanked by trapezoid, pear or tapered baguette diamonds; the most classic royal look. See our three-stone engagement rings.
• Solitaire – nothing competes with the colour. Best suited to stones with excellent saturation and a lively cut.
• Diamond band or pavé – extra sparkle along the shank without crowding the centre stone. See our diamond band engagement rings.

Metals. 18K white gold and platinum keep the blue cool and crisp. Yellow gold warms the stone and suits lighter cornflower tones and vintage-inspired designs. Rose gold gives a soft contemporary contrast. Sapphire is hard but can chip at sharp corners, so for emerald, radiant and princess cuts worn every day we recommend a protective setting: a bezel, a halo, or claws that cover the corners.

How much does a blue sapphire engagement ring cost?

A blue sapphire engagement ring costs far less than a diamond ring of comparable size. At OROGEM Jewelers, blue sapphire engagement rings start at around €1 300 and run into five figures for large certified stones. As a guide:

• €1 300 – €2 000 – sapphires under 1 ct in halo or pavé settings in 18K gold.
• €2 000 – €4 000 – 1 to 2 ct centre stones with good colour, in halo or three-stone designs.
• €4 000 – €8 000 – 2 to 4 ct stones with strong royal or cornflower blue and larger diamond accents.
• €8 000 and above – certified unheated stones, Ceylon origin material and one-off unique pieces.

A sapphire of the same size as a diamond generally costs considerably less, which is why many couples choose sapphire to get a larger centre stone within the same budget. All prices shown include VAT. If you are still weighing up stones and settings, our engagement ring buying guide walks through the whole process.

Where blue sapphires come from

Sri Lanka, still widely known in the trade as Ceylon, is the most important source today and is prized for bright lively cornflower and royal blues. Madagascar produces a wide range of tones and now supplies a large share of the market. Historic Kashmir sapphires, with their velvety texture, are effectively unobtainable and trade at auction prices. Myanmar, Thailand, Australia and Montana also produce commercial quantities. Origin influences price, but a well-cut Sri Lankan or Madagascan sapphire with excellent colour will always outperform a poorly cut stone from a famous locality.

Caring for a sapphire engagement ring

A blue sapphire engagement ring is built for everyday life. At 9 on the Mohs scale, sapphire is the hardest gemstone after diamond and is well suited to daily wear. Clean it in warm water with a drop of washing-up liquid and a soft brush. Take the ring off for sport, gardening and swimming, and avoid ultrasonic cleaners if the stone is heavily included. Have the setting checked once a year; OROGEM offers free cleaning and inspection for rings bought from us.

Other sapphire colours

Sapphire occurs in every colour except red, which is called ruby. Blue is the classic, but the same mineral and the same hardness of 9 on the Mohs scale come in tones almost nobody expects. We also offer green sapphire engagement rings in mint, teal and forest green, pink sapphire engagement rings from pastel to hot pink, and yellow and orange fancy colour sapphires for a warmer, more vintage look.

Blue sapphire, ruby or emerald?

A blue sapphire engagement ring is the most durable of the three coloured-stone classics and the easiest to wear every day. Ruby engagement rings share sapphire’s hardness and bring warmth and drama, while emerald engagement rings offer an unmistakable green but need more careful wear. If none of our ready-made designs is quite right, we also create tailor-made engagement rings around a sapphire of your choice.