Hamid Bros are a wholesale company and only supply the Jewellery Trade.
ABOUT HAMID BROS.
Pits or holes on the gem’s surface are filled with lead glass instead of polishing them out and reducing the size of the ruby. Careful examination with a hand lens will reveal a lustre difference between the ruby and glass filling and bubbles may be visible in the glass.
Although glass fracture filled ruby has been on the market for quite a few years it is still being confused with natural ruby. It is often seen as larger faceted gems and Cabochons which are rare in natural ruby, also in matched sets and cheaper imported jewellery. It is important that jewellers recognise these stones as they are easily destroyed during many basic workshop procedures.
At a glance it appears to look like included Burmese ruby but on closer inspection heavy twinning and growth striations with a tiny network of fractures breaking the surface of the stone are obvious. These fractures allow the glass to enter the gem and mask the inclusions.
Gas bubbles are trapped in the glass filling together with natural ruby inclusions and may be observed with a hand lens or microscope. A bluish haze in the body colour of the stone will be noticeable in strong white light (eg. fibre optic). This is very poor quality ruby virtually held together by glass and has little commercial value.
The glass-fracture filling of poor quality ruby has spawned a new treatment, cobalt –glass fracture filling of rejection quality sapphire.
Whereas the ruby relied on colourless-yellow glass being injected into the multitude of surface reaching fractures, this treatment involves the use of a cobalt-doped (blue) glass, thereby not only improving the clarity of the material but the colour as well.
As with the glass fracture filled ruby, detection by hand lens will reveal numerous bubbles trapped in the glass and a myriad of surface reaching fractures that appear as scratches on the surface. However, the sapphire will show intense blue colouration within the fractures, with an appearance similar to dyed crackled quartz.
Is a process where a thin surface layer of synthetic blue Sapphire is baked onto the surface of a poor quality sapphire to improve the colour and in some cases create a star. This coating can be easily polished off and can be damaged and scratched during everyday wear and tear and whilst being repaired by Jewellers. So while they are cheap, they are not durable. Any sale or purchase of these stones should be accompanied by a full disclosure of the treatment.
When faceted gems are immersed in water against a white background the facet edges appear darker. This is due to the concentration of colour occurring at the junctions of the facets.
Diffusion Coated Sapphire
Diffusion Coated Sapphire Immersed
Diffused Star Sapphire
When illuminated from behind, the poor quality green/blue sapphire disguised by this diffused star is revealed.