I work with some diamond suppliers to source stones before having them set in rings. Whenever the topic of some online retailers come up, the diamond suppliers always mention that these online retailers advertise the lowest quality of stones which suppliers usually refuse themselves, hence why they are being pushed by online retailers at cheaper prices.
For example, we can set the filters to VVS2, F colour, Excellent cut, low fluorescence etc and the online retailer might have a list of 20 stones for those specs however the lower end may be around $2500 whereas the upper end of the list will be around $4000. This means there must be a clear difference in the quality of these stones if there is such a large difference in price (despite being the same on paper) however is there any way to identify and separate the 'low quality stones' from the better stones without looking at the price? Are there any certain specs/factors that we could look for on the certificate?
For example, we can set the filters to VVS2, F colour, Excellent cut, low fluorescence etc and the online retailer might have a list of 20 stones for those specs however the lower end may be around $2500 whereas the upper end of the list will be around $4000. This means there must be a clear difference in the quality of these stones if there is such a large difference in price (despite being the same on paper) however is there any way to identify and separate the 'low quality stones' from the better stones without looking at the price? Are there any certain specs/factors that we could look for on the certificate?