Palmaa — Proprietary Resin Filler for Emerald Clarity Enhancement
Palmaa — Proprietary Resin Filler for Emerald Clarity Enhancement
A polymer-based fissure filler positioned alongside cedarwood oil and Opticon in the emerald treatment landscape
Palmaa is a proprietary resin filler used in the clarity enhancement of emerald, marketed as an alternative to cedarwood oil and to other polymer fillers such as Opticon and ExCel. The product belongs to the broad category of artificial resin fillers — substances introduced into surface-reaching fissures of emerald to reduce the visibility of internal cracks and improve apparent clarity. Like all clarity-enhancement fillers, Palmaa must be disclosed under the disclosure conventions of the major coloured-stone laboratories and the AGTA filler-grading framework.
What Palmaa is
Palmaa is a polymer-based filler with a refractive index close to that of emerald, approximately 1.57 to 1.58 — close enough that fissures filled with the resin become substantially less visible against the host. The proximity of refractive index is the basic optical principle behind every fissure filler in coloured-stone work, from low-viscosity oils to harder polymer resins. What separates resin fillers such as Palmaa from oils is durability: a cured polymer resists the slow weeping that affects oiled stones and is less likely to escape under heat or solvent exposure during routine setting and cleaning. The trade-off is detectability — cured polymers leave a more conspicuous spectroscopic and microscopic signature than mineral oil and are universally disclosable.
Detection and disclosure
Polymer fillers are detected at major laboratories by a combination of magnification, ultraviolet response, and infrared spectroscopy. Under the microscope, polymer-filled fissures show flash effects in colours different from those of oil fillers and may exhibit a granular or bubbled texture where curing has been incomplete. Infrared spectra produce characteristic polymer absorption bands. Where significant filler is present, AGTA, GIA, and the European laboratories grade the enhancement as F1, F2, or F3 on the AGTA Enhancement Code scale corresponding to insignificant, moderate, or significant filler — a system widely accepted across the coloured-stone trade.
Disclosure of polymer filling is mandatory at the laboratory level and at retail. The trade does not treat resin filling as equivalent to oil; resin-filled stones typically trade at a discount to comparable oil-only stones because the more aggressive enhancement and the comparative novelty of some proprietary resins lead buyers to pay for less treatment, all else equal.
Stability and care
Polymer fillers are more stable than mineral oils in routine handling but remain vulnerable to heat, ultrasonic agitation, and aggressive solvents. Steam cleaning, ultrasonic cleaning, and the heat of jeweller's torch work can compromise the filler, leading to cloudy fissures and apparent loss of clarity. Polymer-filled emerald should be cleaned by mild soap and lukewarm water, and re-treatment is feasible only by laboratories or treaters experienced with the specific resin in question.
Setting jobs on emerald — whether oiled, Palmaa-filled, or Opticon-filled — should be undertaken by jewellers familiar with the constraints. The standard precaution of removing emerald from a piece before any torch work is at least as important for resin-filled material as for oiled.
Position in the market
Palmaa occupies a small share of the polymer-filler market dominated historically by Opticon and by treaters' in-house formulations in Bogotá and Jaipur. Buyers of any emerald presented with a polymer filler should obtain a laboratory report confirming the filler grade and the absence of dyed material; resin fillers are sometimes used in combination with green dyes in lower-quality goods, a practice that materially worsens the disclosure picture. Within Skyjems' supply, oil-only enhancement remains the preferred treatment status for fine emeralds, with polymer fillers reserved for explicitly disclosed commercial and mid-grade material.