Seta 925 is the name of a company and the metals that made the  necklace and ring. A marking of 925 is at least 92.5% sterling  silver.
http://www.answers.com/Q/What_do_the_letters_PGDA_mean_on_a_925_italian_silver_necklace
A 5% solution of DOWANOL PGDA in water, with the pH modified using NaOH. After 21 days a percentage of 8.8 moles was hydrolyzed. b) A 5% solution of DOWANOL PGDA in pure distilled water. After 21 days a percentage of 8.35 moles was hydrolyzed. a) pH = 3 at room temperature. A 5% solution of DOWANOL PGDA in water, with the pH modified by HCl.
http://www.dow.com/assets/attachments/business/pcm/dowanol/dowanol_pgda/tds/dowanol_pgda.pdf
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Uses for DOWANOL PGDA include: • Can/coil coatings, acrylic paints, epoxy and polyuretha ne coatings, general paint and varnish formulations, high quality thinners, high gloss enamels, etc.
http://www.dow.com/assets/attachments/business/pcm/dowanol/dowanol_pgda/tds/dowanol_pgda.pdf
Making the world better, one answer at a time. PGDA-The Stock Symbol for Piercing Pagoda. The Necklace was made by and purchased at Piercing Pagoda. It's .925 silver-which means it's sterling silver. Worth about... oh... $50. Maybe.
http://www.answers.com/Q/What_do_the_letters_PGDA_mean_on_a_925_italian_silver_necklace
1 All of those answers and more, now available! https://t.co/WdJYDlzQN0. 2  Deadline for PDGA Innovation Grants approaching quickly! 3  #discgolf http://t.co/oMDXDEKOFi. 4  Here's a great story to get your work week started.
http://www.pdga.com/
Prenatal diagnosis by amniocentesis or chorionic villus sampling often allows diagnosis of the genetic disease during pregnancy. However, many couples do not want to face the decision of ending an ongoing pregnancy for a genetic disease. PGD is available for many autosomal recessive genetic disorders.
http://www.givf.com/geneticservices/whatispgd.shtml
DOWANOL™ PGDA Propylen glycol diacetate Description DOWANOL PGDA, propylene glycol diacet ate, is a highly pure chemical product (more than 99.5% pure). It is a clear, colorless, practically odorless liquid with a comparatively high boiling point.
http://www.dow.com/assets/attachments/business/pcm/dowanol/dowanol_pgda/tds/dowanol_pgda.pdf
Prenatal diagnosis by amniocentesis or chorionic villus sampling often allows diagnosis of the genetic disease during pregnancy. However, many couples do not want to be faced with making a decision regarding the outcome of their pregnancy. PGD is available for many autosomal dominant genetic disorders.
http://www.givf.com/geneticservices/whatispgd.shtml
PGD can be used for diagnosis of a genetic disease in early embryos prior to implantation and pregnancy. In addition, this technology can be utilized in the field of assisted reproduction for aneuploidy screening and diagnosis of unbalanced inheritance of chromosome abnormalities, such as translocations or inversions.
http://www.givf.com/geneticservices/whatispgd.shtml
what is pgda
PGDA is the stock symbol for Piercing Pagoda.