Recently examined in the Carlsbad laboratory was a 26.72 ct transparent violet modified cushion mixed-cut stone (figure 1). Standard gemological testing revealed a refractive index of 1.583–1.592 and a specific gravity of…
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A white, non-nacreous baroque pearl weighing 15.53 ct and measuring 19.54 × 13.26 × 11.57 mm (figure 1) was recently submitted to GIA’s Carlsbad laboratory for examination. Information from previously observed non-nacreous…
The diamond industry was optimistic in February as the US and China saw solid jewellery sales, the Rapaport group said in a press release. Polished trading was steady during the month, though…
Alrosa reported a 7% drop in revenue for the year 2020, at RUB 221.5 billion ($3 billion), as the Covid pandemic led to drop in demand for diamonds and compelled it to…
Amplified with an assortment of precious gemstones, pearls and polkis, jadau jewellery still retains a hold over today’s brides. Jadau jewellery is a perennial favourite of Indian brides for decades. Handcrafted with…
Platinum Guild International’s (PGI’s) Platinum Jewellery Business Review (PJBR) Q4 2020 reports platinum has been instrumental in leading the overall jewellery industry recovery in 2020 across key markets – China, India, Japan…
Australia’s gold mine output totalled 327 tonnes in 2020, a record for any calendar year and about 1.5 tonnes more than in calendar 2019, according to Melbourne-based gold mining consultants, Surbiton Associates.…
Platinum Guild International’s (PGI’s) Platinum Jewellery Business Review (PJBR) Q4 2020 reports platinum has been instrumental in leading the overall jewellery industry recovery in 2020 across key markets – China, India, Japan…
The Carlsbad laboratory received for examination two dark-colored bead cultured pearls embedded with an electronic device (figure 1) from Jeremy Shepherd, CEO of Pearl Paradise. The first sample had been cut in…
When it comes to clarity enhancement with oils and resins, a common belief is that the refractive index of the host gem must match that of the filler. If one follows this…