Dodgy Certificate
It's not the first time we have encountered a Westminster Collection certificate with errors in it, in fact, it's becoming quite a common occurrence.
This one states the weight to be "28.28g", which we assume to mean grams. The coin actually weighs 31.053 grams. We guess somebody at Westminster worked out that the coin weighed one ounce, or contained one ounce of gold, or was supposed to, and then converted it into grams, forgetting (or not knowing) that when one is dealing with precious metals, it is always understood that all ounces are troy ounces not avoirdupois ounces. We notice this type of error and inaccuracy quite often in material from Westminster, leading us to believe that most if not all of their personnel know very little if anything about coins, collecting, gold, precious metals, or much else. However it is difficult not to respect their marketing abilities, even if we do not admire them.

Prices

Technical Specifications

Size	Diameter	Weight	Alloy	Gold Content	Gold Content
	mms.	Grams	/1.000	Grams	Troy Ounces
Fifth	38.60	31.853	.9999	31.053	0.9983

Notes
Weight = Gross weight in grams.
Gold Content = Actual gold content in troy ounces.

Prices & Availability
Please contact us prior to ordering for current prices and availability.
The prices quoted in the US $ column may be out of date due to currency fluctuations.

Date	Description	Version	Mintage	Availability	Price £	Price $
2002	Queen Mother with Princess Diana at Prince William's Christening	Proof	100	Yes	£595	$1,090

Postage & Packing
UK Registered Post (Special Delivery) £9 per order
EU Insured Post £10 per order
USA Airmail $10 per order
USA Insured Shipping $20 per order

Answer
Original Purchase Price £225
£450 the pair, in 10 instalments of £45 each.