Melbourne client care · Made in Surat
Diamonds are not the only option for fine jewellery. Sapphires, rubies, emeralds, and a wide range of other gemstones have been used in the most significant pieces of jewellery throughout history. This guide introduces every major gemstone relevant to fine jewellery — what each is, how it is graded, how durable it is and when it makes sense as an engagement ring or fine jewellery choice.
Some of the most historically significant engagement rings are not diamond. The engagement ring given to Princess Diana — now worn by Catherine, Princess of Wales — is a 12-carat oval blue sapphire. The engagement ring of Grace Kelly was a Cartier emerald-cut ruby and diamond piece. Coloured gemstones have been part of the finest jewellery traditions for centuries.
The renewed interest in coloured gemstone engagement rings reflects something genuine: a desire for individuality, for stones that express personality and for pieces that stand apart from the conventionally expected. A sapphire ring does not look like everyone else's ring. An emerald ring does not look like anyone else's ring. For buyers who want something meaningfully individual, coloured gemstones offer what diamonds cannot.
At Fenora, coloured gemstones are available as centre stones in the full range of engagement ring settings — alongside lab grown diamonds and moissanite. Every Fenora coloured gemstone is laboratory grown, sourced ethically and set in recycled 18KT gold or platinum 950 to the same craftsmanship standard as every other Fenora ring.
The complete guide to every major gemstone used in fine jewellery — material, hardness, colour range, durability for daily wear and availability at Fenora.
Coloured gemstones are not graded on the same system as diamonds. The 4Cs (cut, colour, clarity, carat) are broadly applicable, but the grading standards are not as precisely standardised for coloured stones as they are for diamonds. Colour — specifically the hue, tone and saturation of the colour — is the dominant quality factor for coloured stones.
| Quality Factor | For Diamonds | For Coloured Gemstones |
|---|---|---|
| Colour | D-Z scale — less colour is better for white diamonds | Hue (which colour), tone (light to dark), saturation (intensity). More saturated, more vivid is generally better |
| Clarity | FL to I3 — standardised grading by IGI/GIA | Less standardised. Eye-clean is the practical standard. Emeralds routinely contain inclusions; sapphires and rubies are expected to be cleaner |
| Cut | Excellent to Poor — standardised for round brilliants | No universal standard. Cut affects how the colour is presented. Oval and cushion cuts particularly suit coloured stones |
| Carat | Weight in carats (0.2g per carat) | Same weight measurement but coloured stones have different densities to diamond — same carat weight appears different size |
| Enhancement | Disclosed on certificate | Many natural coloured stones are heat treated to improve colour. Lab grown stones are not treated — their colour is from growth |
Just as lab grown diamonds are chemically identical to mined diamonds, lab grown sapphires, rubies and emeralds are chemically identical to their natural counterparts. The same crystal structure, the same chemical composition, the same physical and optical properties.
| Factor | Natural Gemstone | Laboratory Grown Gemstone |
|---|---|---|
| Chemical composition | Identical mineral | Identical mineral — same chemistry |
| Crystal structure | Natural growth patterns | Identical crystal structure |
| Physical properties | Identical | Identical — same hardness, same optical properties |
| Colour | Variable — depends on what was mined | Consistent and controllable — grown to specification |
| Inclusions | Often many — part of natural formation | Generally fewer — cleaner growth conditions |
| Price | Carries rarity premium — can be very expensive for fine colour | Dramatically less expensive — no rarity premium |
| Environmental footprint | Mining — significant land and water impact | Laboratory — controlled, traceable, no excavation |
| Traceability | Often limited supply chain visibility | Fully traceable to growth facility |
Hardness is the most critical practical consideration for a gemstone worn daily in an engagement ring. Stones below 8 on the Mohs scale will develop surface scratches over time from contact with dust and harder everyday materials.
| Gemstone | Mohs Hardness | Daily Wear Verdict | Specific Risks |
|---|---|---|---|
| Diamond | 10 | Exceptional — the standard | Can scratch any other stone |
| Corundum (Sapphire, Ruby) | 9 | Excellent — very durable | Can be scratched by diamond |
| Alexandrite (Chrysoberyl) | 8.5 | Very good — recommended for daily wear | Generally very durable |
| Moissanite | 9.25 | Exceptional | Only diamond can scratch it |
| Spinel | 8 | Good | Some chipping risk under sharp impact |
| Topaz | 8 | Good | Cleavage can cause splitting under sharp impact |
| Beryl (Emerald, Morganite) | 7.5–8 | Moderate — use with care | Surface scratching develops over time with daily wear |
| Quartz (Amethyst, Citrine) | 7 | Caution — below recommended threshold | Scratches from everyday dust over time |
| Opal | 5.5–6.5 | Not recommended for daily wear rings | Very soft — scratches and chips easily |
The right coloured gemstone engagement ring starts with the same questions as any engagement ring — but with one additional consideration: does the colour have personal significance?
Book a free online consultation. Yash Chandpara shows every coloured gemstone option on screen and helps you find the right stone, colour and setting for your brief.
