Love & Co is one of the retail in Singapore that carry IGI Ideal H&A diamonds. The LOVE brand from HK Chow Sang Sang also carry the same IGI H&A report.
Most of the lower grade diamond are from IGI Diamond Report and a lot of retail shops selling these IGI report diamond with much lower price compared to GIA.
I found some useful statement about IGI Ideal H&A in pricescope. There are 2 type of report from IGI - Diamond Report & Ideal H&A Report.
See below the comment about IGI Ideal H&A from John Pollard.
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John Pollard, BME BA AS (WSU) AJP (GIA)
US Executive, Infinity Diamonds
Actually the loose diamond grading results at IGI's HK lab are widely considered on par with GIA. The "Hearts & Arrows" grading report from the HK lab is seen in much the same way that an AGS Ideal report is in the US.
The Love brand examples I saw were high in quality, and while it's impossible to judge a large production from a handful of samples there are authorities I respect who hold that brand in high regard.
Be wary of the term "H&A" which is used a lot like "ideal" in the US. The term has an association-with-quality but usage encompasses a wide range of quality and performance, depending on who is using it. IGI Hong Kong produces H&A grading reports and the top format includes actual H&A images taken in a standardized laboratory environment. For buyers specifically seeking "H&A" diamonds it's a well regarded document. The Love brand uses a version of this report, customized to maintain a slightly stricter set of proportions and precision requirements.