Blog — diamonds and gemstones
Diamonds and gemstones: guides to choosing, treatments, care and gemmological news.
Ethiopia, a new Paraíba tourmaline source: GIA and Gübelin’s 2026 announcement
On 27 August 2026, GIA and Gübelin confirmed a new copper-bearing tourmaline source. Understand the announcement and its limits.
What 2025 FTIR research adds to detecting heat in ruby and sapphire
GIA research explains infrared signals in corundum. Understand why a single indicator is not a universal treatment verdict.
GIA and laboratory-grown diamonds: the 2025 Premium / Standard change
GIA announced descriptive assessment for D–Z laboratory-grown diamonds. Read documents without confusing different reporting systems.
Sapphire, tanzanite or aquamarine: three ways to choose blue
Similar colour does not mean the same gemstone. Compare appearance, wearing requirements and documentation for three blue gems.
Ruby, spinel or garnet: choosing a red gemstone
Three gemstone families offer attractive reds. Compare identity, appearance and documents before selecting your jewellery.
Paraíba tourmaline: the colour name does not prove Brazilian origin
Paraíba is associated with copper-bearing tourmaline. Distinguish variety identification from geographic origin determination.
Ametrine: violet and yellow in one gemstone
Ametrine combines amethyst and citrine colour zones. Appreciate its cut and verify material identity.
Rose quartz: choosing a translucent stone without exaggerated claims
Appreciate rose quartz through colour, appearance and workmanship. What to check in cabochons, strands and carvings.
Sunstone: feldspar sparkle and confusion with decorative glass
Sunstone can show aventurescence. Observe the effect in motion and clarify decorative trade names.
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