AboutA. DeMello Gemological Laboratory - Arthur DeMello GG (GIA) Expertise Questions pertaining to Diamonds and Fine Jewelry regarding Evaluation and Valuation Sciences. Questions may include Gemology, Appraisal, Identification, Issues with Jewelers, Complaint Resolution, Jewelry Insurance,Estate Settlement, Family Disputes, Marital Settlements and Unfair Jewelry Trade Practice.
Experience I have 23 Years as a self employed Diamond and Fine Jewelry Consultant, Appraiser and Court Expert Witness.
Organizations GIA Alumni Association
Former National Assoc. of Jewelry Appraisers
Publications Online Question & Answer Forums
Education/Credentials Berklee College BA. Gemological Institute of America (GIA) GG. American Gem Society Courses toward CG. Undergraduate Studies in Business.
Past/Present Clients 1983 - 1986 RO-AN Jewelers Taunton, Mass. Store Manager
1986 - 1989 Hyannis Jewelers, Hyannis, MA. Appraiser 3 Stores under Eugene Munn former Pres. Concord Watch.
1989 - 1991 Shreve, Crump and Low Boston Mass. Contact: Mark Aaron Marks Jewelers Wareham, MA.
1991 - Present GAB Robbins - New Hampshire Insurance Claims Consultant Appraiser.
1991 - Present AIG- American International Group Insurance Claims Springfield, Mass. Consultant
1991 - Present Aetna - Hartford Group Insurance Co. Middleboro, Mass.
1991- Present Quincy Mutual Fire Insurance Co. Quincy, Mass.
1991 - Present Hanover Insurance Co. North Dartmouth Mass. Contact Stephen Foss Consultant
1995 Founder of National Gemological Laboratories - Massachusetts Based Firm President /Owner
2004 - Boston Bar Association Legal Expert Witness
2004 - Mass. Bar Association Legal Expert Witness
2005 - Present AIG - American International Group Appraisal Client Referrals
2005 - Dept. of Financial Services - Unclaimed Property Invitation to Bid
200 East Gaines Street
Tallahassee, Florida 32399-0360
2005- Guardsmark Security New York, NY. Appraisal Client
2005 Oscar Heyman & Brothers LLC New York, NY. Tradeshows through Bailey, Banks & Biddle Jewelers
2005 - Scott Kay Teaneck, NJ. Tradeshows through Bailey, Banks & Biddle Jewelers
2005 - Reed & Barton -Taunton, MA. Client Referrals
2006 - United States Treasury Dept. Drug Enforcement Administration New Bedford, MA
2006- Citigroup Smith Barney New York, NY
Question I understand that you can't answer about valuation regarding a stone. Is it possible for you to comment on the first part, regarding the a stones girdle and its effect on look/strength/pricing. And can you please help guide in the right direction regarding table/depth measurements for which I should look in a princess cut stone? Thanks in advance!
Tom
Answer Ok Tom,
Good Question!!
As there has not been established an Ideal Proportion or Ideal Cut by AGS for Princess Cut Diamonds, I feel a safe rule of thumb for Princess Cut Diamonds is ex Table 69% - 77%, Total depth% 69 - 73% 32 - 35 degree crown angle and a 16 - 16.5% crown height %.
Also I prefer a thick med - thick girdle.. Too thick is wastefull and less than med. can be easily chipped.
Call the office if you need a complete appraisal.
We can do this with or without an appointment.
Sincerely,
Arthur DeMello GG (GIA)
60 State Street Suite 700
Boston, MA. 02109
617 742-1630 ofc
508 558-0277 cell
