Blog — diamonds and gemstones
Diamonds and gemstones: guides to choosing, treatments, care and gemmological news.
Star sapphires: understanding the star and what to check
A sapphire’s star is an optical phenomenon. Learn how to observe it and why it does not by itself prove natural origin.
Heated, unheated or diffusion-treated sapphire: reading the report
A natural sapphire may be treated. Learn why heating and diffusion need separate discussion and what documentation to request.
Sapphire is more than blue: colours and trade names
Sapphires occur in blue, pink, yellow and other colours. Learn to separate the gemstone variety, trade description and declared origin.
Ruby rings: checking the setting and caring for your jewellery
Ruby resists scratching well, but the setting and treatments affect care. A practical guide to wearing and storing your ring.
Heated or glass-filled ruby: why the distinction matters
Heating and fracture filling are different treatments. Learn what to ask about a treated ruby and how to read its description.
Choosing a ruby: colour, transparency and proportions
There is more to ruby quality than an intense red. Learn how to compare colour, transparency and a stone’s appearance.
The diamond 4Cs: comparing two stones with confidence
Carat weight, colour, clarity and cut: what the 4Cs describe and how to use them together when choosing a diamond.
Valuing gold jewellery with diamonds and gemstones
Gold fineness, gemstone quality, craftsmanship and brand all affect jewellery value. Here is what a professional valuation considers.
Moissanite vs. diamond: recognising the difference
Moissanite may resemble diamond but is a different material. Learn why professional identification prevents an expensive misunderstanding.
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