New Excel Enhancement: R.I. = 1.52?

If an enhancement filler has the same refractive index (R.I.) as the host gem, the fracture being filled virtually disappears. Arthur Groom's Excel emerald enhancement, for example, has an R.I. of approximately 1.57—the same as emerald. So why did Groom create Excel 1.52?Fernando Garzon, partner i

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