Ruby Gemstone Guide
ZGems education · Updated
Ruby is the red variety of corundum, the same mineral family as sapphire. Its colour makes it a striking starting point for a personal ring, pendant or earrings. ZGems offers its Ruby range as lab-grown ruby; read the selected product’s specifications and creation disclosure when comparing stones.
Compare red by brightness and tone
These are illustrative colour swatches, not grading categories or photographs of individual stones.
Ruby at a glance
- Material
- Red corundum.
- Colour cause
- Chromium contributes ruby’s red colour.
- Mohs hardness
- 9. Hardness describes scratch resistance, not immunity to damage.
- ZGems range
- Lab-grown ruby, with carat and shape options on individual listings.
Material reference: GIA: Ruby.
Choose the red you want to wear
Compare the actual stone face-up, noting whether its red looks warmer, cooler, lighter or deeper to you. Ask for views in different lighting and check whether visible features or large dark areas distract from the colour you like.
A descriptive name is not a complete quality assessment. If a special colour designation, natural origin or treatment status matters to the purchase, ask what individual documentation supports it. Do not infer a mined locality from a red shade.
The gemstone colour guide gives you a vocabulary for describing your preference; the clarity and colour guide explains why diamond clarity labels should not automatically be applied to ruby.
Lab-grown ruby and individual stone details
A lab-grown ruby is a manufactured ruby rather than a naturally formed one. The creation disclosure does not tell you every detail about its growth, treatment, inclusions or cutting. Ask those questions separately for the item you are considering.
For a loose stone, confirm length, width and depth, the selected carat option, whether an image represents the actual stone and what report information is available. For a jewellery piece, confirm the metal, size, setting and which stones its quality descriptions cover.
Shape, setting and wear
Round, oval and cushion shapes offer different rounded outlines. Emerald, radiant, princess and Asscher shapes introduce more geometry; pear, marquise and heart outlines create a more distinctive silhouette. Choose the actual stone’s proportions rather than a promised universal “best ruby cut”.
Use the gemstone cuts guide, then discuss the dimensions and any exposed corners or points with the jeweller. A ruby can be considered for a frequently worn ring, but condition, treatments and the setting must be assessed together.
For a gift, personal meaning can come from your own story: a favourite colour, an anniversary or a design reference. Symbolic associations are personal, rather than physical benefits of the gemstone.
Ruby care and cleaning
GIA notes ruby’s strong wear properties while highlighting treatment-related exceptions. Filled or dyed material needs different handling from untreated material. Request care instructions for your stone and setting before choosing a cleaning method; see GIA: Ruby Care and Cleaning.
Common ruby questions
Is ruby a type of sapphire?
Ruby and sapphire are varieties of corundum; red corundum is called ruby. Read the material and colour description together.
Is every red gemstone a ruby?
No. Red appearance alone does not establish the material. Check the identity and creation disclosure.
Can I design jewellery around a loose ruby?
Yes. Share the selected product and your ideas through custom jewellery design. Confirm the dimensions, proposed setting and quote for the whole piece before ordering custom work.