Gemstones: colour, character and care

Describe a colour before naming a stone

Start with the effect you hope the colour will create. Is it a quiet accent, a strong focal point or a link to an existing jewel? Bring a small set of references and explain what you like in each one. A photograph of fabric, a drawing or an architectural detail can communicate a preference, but it should not be treated as a contractual colour standard for a natural material.

Ask for a concise colour brief in ordinary language. You might describe a preference for a vivid appearance rather than a very dark one, or for a balanced pair rather than a perfectly uniform suite. Keep room for the actual candidates to surprise you. The purpose of the brief is to direct the selection, not to force a stone into a colour description that does not accurately fit it.

Ruby: examine the particular red being offered

Ruby is the red variety of corundum. Colour descriptions should help you discuss a specific stone rather than encourage you to purchase a phrase. Ask the adviser to show the actual ruby in a steady view and then in motion, and to state the treatment information available for that specimen.

For your own comparison, note how readily you can see detail within the stone, how its outline relates to the design and whether its colour works with the chosen metal. Do not regard an attractive trade description as a substitute for a report or for the supplier’s written disclosure. When choosing between two rubies, keep origin, treatment, measurements and included documentation on the same comparison page. That helps prevent a difference in scope from being mistaken for a simple difference in price or beauty.

GIA — Ruby quality factors

Sapphire: do not reduce the choice to blue alone

Sapphires occur in several colours, not only blue. Begin by establishing the variety and description of the stone being proposed. Then ask the same practical questions you would ask of any candidate: what is documented, which treatments are disclosed, what are its measurements and which observations can be made from the actual presentation?

For a pair of earrings, compare the two stones together in the same frame. For a central stone, compare its presence with the surrounding elements of the design. Ask whether a slightly different proportion would suit the setting better than an increase in weight. Do not assume that a label associated with a place establishes that stone’s geographic origin. If origin is relevant to your decision, ask what the document actually concludes, including any limitations or absence of an opinion.

GIA — Sapphire quality factors

Emerald: character and transparency need context

Emerald commonly contains visible internal characteristics. A clarity-enhancement assessment is not an overall beauty grade. Rather than interpreting every visible feature as either a defect or a romantic advantage, ask what is known about the particular stone and how its characteristics relate to transparency, setting and care.

Look at the emerald without demanding that it behave like a different gem material. Request a face-up view, a slow rotation and an explanation of the stated treatment level where such information is available. Ask the atelier whether the proposed design needs any adjustment for that specimen. An appreciation of individual character and a clear technical description can coexist. Keep both in the decision: you should be able to say why you enjoy the stone and also understand which information remains unknown or requires a specialist opinion.

GIA — Emerald quality factors

Ask for treatment information in writing

Identity, natural or laboratory-grown origin and treatment are separate questions. A stone can be natural and treated. The existence of a treatment should therefore lead to a precise description, not to a vague assurance that a gem is simply “real”. Ask what treatment is stated, how that statement was established and which care implications accompany it.

Place these answers beside the quotation. When the evidence does not settle a point, retain the uncertainty in the written description rather than silently converting “not known” into “none”. Do not perform home heating, scratching or chemical experiments to test a gemstone. If further examination is important to your purchase, discuss the appropriate professional service before approving the order. The objective is informed selection, not a promise that every kind of treatment can be identified from an online listing.

GIA — Disclosure of treated and laboratory-grown gem materials

Create a repeatable viewing routine

Request consistent presentations of shortlisted stones: the same neutral background, a similar distance and a slow movement rather than rapid cuts. Ask for more than one ordinary lighting situation when practical. Use your notes to describe what changes between the views, rather than assigning a grade from the brightness of a screen.

For an online purchase, acknowledge the limits of remote presentation explicitly. Discuss which details can be confirmed by measurements or reports and which remain matters for direct viewing. Do not use a filter-enhanced social video as the sole colour reference. Save the approved product reference and its version, but keep the written specification primary. If you and the adviser appear to be describing different colours, pause and resolve that difference before moving on to a stone reservation or final design approval.

Design around the actual stone

A bespoke setting should be discussed around the measurements and characteristics of the selected gem, not only around an attractive silhouette. Ask how much of the outline will remain visible, which parts need support and how the jewel will sit on the hand, neck or ear. Request side views when height matters and ask which measurements are indicative until the final specification is agreed.

For a change of centre stone in an existing design, do not assume that equal weight means an interchangeable fit. Ask the atelier to confirm feasibility, any required adjustments and the resulting quotation. Consider the relationship between the coloured centre and surrounding diamonds or metal. The aim is a coherent composition, not the largest possible stone inserted into a drawing that was prepared for another specimen.

Care belongs to the whole jewel

Cleaning must suit the most sensitive element of the actual piece. GIA advises against ultrasonic and steam cleaning for emeralds and pearls. That is a useful reminder that one routine should not be applied to an entire jewellery box simply because it worked for one item.

Ask for a care note identifying the materials, known treatments and any mounting or stringing considerations. Keep cleaning products and methods within those instructions. After wear, look for changes you can describe without trying to repair them: an unexpected movement, a loose component, a new snag or a visible impact mark. Stop wearing the piece when something seems wrong and seek advice. For a mixed-material creation, ask explicitly whether the care instructions address every component. A clear, modest routine is more useful than a complicated ritual built on assumptions.

GIA — Emerald care and cleaning

GIA — Pearl care and cleaning

Keep a complete stone record

Create a small record for the purchase: reference number, images of the selected specimen, measurements, weight, material identity, stated origin, disclosed treatments and any report supplied. Separate a geographic-origin opinion from a description of natural or laboratory-grown growth. When no origin opinion is supplied, write that rather than inferring a location from colour or the name of the design.

For a pair or suite, identify which document belongs to which stone and whether the report covers an individual specimen or several items. Keep the final agreed version rather than an earlier example. When a stone is substituted, refresh the record. This is not bureaucracy for its own sake: it gives future servicing, remodelling discussions and personal record-keeping a reliable starting point without requiring you to remember every detail of the original consultation.

Bring the discussion back to your project

End the comparison by returning to the original brief. Which candidate expresses the colour you wanted? Which questions have been answered in writing? Which practical compromises are you comfortable accepting? A confident choice is not necessarily the most dramatic stone; it is one whose character, specification and place in the jewel are clear to you.

When speaking with Nova, reference the exact product or send a concise bespoke brief with your preferred material, outline, dimensions, intended use and total budget. Ask the team to confirm what is currently available and what would require a separate proposal. Do not treat an example in this guide as an offer of a particular gemstone. The final decision should connect your own taste to an identifiable creation and an agreed specification, rather than to an abstract promise of perfection.

FAQ

Does “natural” mean untreated?

No. Ask separately about identity, growth origin and treatments. Keep the actual written disclosure with the quotation.

Can two equal-weight coloured stones fit the same setting?

Do not assume it. Ask the atelier to compare actual dimensions and assess the particular specimens before confirming a replacement.

Should a trade colour name decide the purchase?

Use it as a prompt for clarification, not as proof of origin or an overall quality guarantee. Compare the actual stone and its documents.