Product categories and sourcing
Gemstone Types: Loose Stones and Buying Criteria
Sapphire, ruby, emerald and all supported coloured stone types. Choose a species, variety, shape and treatment disclosure for your project.
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Choose by stone type, variety and project
This directory covers 32 supported stone types and groups in the catalogue. Check availability after opening the selected filter. Choose the stone first, then specify colour, measurements, carat weight and acceptable treatments. Broad groups such as beryl and quartz may overlap with individual varieties.
Main gemstone categories
Sapphires
Compare blue, pink, yellow and green sapphire. Review saturation, colour zoning and disclosed treatments. For an unheated or padparadscha description, look for supporting information in the laboratory report.
Rubies
For ruby, compare red colour, transparency and inclusions. Distinguish heating from fracture filling: the treatment disclosure matters to both price and care. A commercial colour name alone is not laboratory evidence.
Emeralds
Compare emeralds by green colour, transparency and visible inclusions. Check whether clarity enhancement with oil or another substance is disclosed, and to what extent. Match the setting and care to the individual stone.
Tourmalines
Start a tourmaline search with the exact colour and variety. Rubellite, paraiba and bi-colour tourmaline serve different visual briefs. For elongated stones, compare proportions and colour distribution alongside total weight.
Tanzanites
Compare a tanzanite’s blue and violet hues under consistent lighting. Its visible colour can change with viewing direction. Review treatments and discuss protection in the intended setting with your jeweller, especially for an everyday ring.
Aquamarines
For aquamarine, establish the preferred blue or greenish-blue tone, then compare transparency and millimetre measurements. Higher weight does not guarantee stronger colour. Look for balanced imagery and video without strong reflections obscuring detail.
Opals
Start an opal comparison with the type: black, white, fire or boulder. Review body colour, play-of-colour, pattern and thickness. Establish whether the offer is a solid stone or assembled material and what care it needs; one front-facing photograph is insufficient.
Garnets
Garnets span different varieties and colours. Compare tsavorite, demantoid, spessartine and rhodolite within their own context. Record the precise variety and intended colour in the brief; the broad label “garnet” is insufficient for a precise price comparison.
Topaz
For topaz, establish colour and treatment disclosures before comparing prices. London blue, Swiss blue and imperial are different starting points for sourcing. Compare measurements and discuss a suitable setting and care with your jeweller to avoid inappropriate stress on the stone.
Alexandrites
For alexandrite, request imagery under different light sources to assess colour change. Verify natural or laboratory-grown origin and consistency with the report. Compare stones of similar measurements and a comparable visible colour-change effect.
More stone types and groups
Next criteria: colour, shape and treatments
After selecting a stone type, refine by variety, colour, shape, carat weight, cutting style and disclosed treatments. Do not automatically apply diamond grading scales to coloured stones. An existing setting needs precise measurements; a new project also needs a budget and intended jewellery type.
Zircon is a separate stone type in the catalogue. It is not a generic name for laboratory-grown diamond. Always read the identity stated in the individual offer.
Sapphire, ruby and emerald price comparison · Sourcing for jewellers
From information to a precise shortlist.
Apply the criteria to the current catalogue, then verify documentation, price and availability for the selected stone.
Open the catalogue